C5.c

#define VERSION 3.1

#include <stdio.h> //for printf(), scanf(), etc.
#include <string.h> //for strlen()
#include <stdlib.h> // for exit()
#define error fprintf(stderr,"Invalid Input, Sorry.\n"); //macro template for std error message

int *pin(char **); // Retruns digits in pin
void encrypt(char **); 
void decrypt(char **);

int ctln(size_t); //Catalan numbers
int fib(size_t);// Fib nos.
int luc(size_t);// Lucas nos.
int pent(size_t);// Pentagonal nos.
int hex(size_t);// Hexagonal numbers.
int prm(size_t);//Prime numbers.

// Refer https://edublognss.wordpress.com/2013/04/16/famous-mathematical-sequences-and-series/ for info on  these number series.
// use '_getw()' and '_putw()' with Visual Studio (for some stupid reason)

int main(int frequency , char * arguments[])
{
	if(frequency >= 5)
	{
		char edx = *arguments[1];

		if (edx == 'e' || edx == 'E')
			encrypt(arguments);

		else if (edx == 'd' || edx == 'D')
			decrypt(arguments);

		else 
			error 
	}
    else
        fprintf(stderr,"Not enough arguments.\n");

	return 0;
}

int *pin(char * arguments[])
{
    
    static int pins[8];
    char * pswd = arguments[2];
    size_t len = strlen(pswd);  

    if(len < 8) // makes sure password is NOT < 8 chars.
    {
        fprintf(stderr,"Error : Password less than 8 characters.\n");
        exit(-1);
    }
    else
    {
        for(int i =0;i<8;i++){
            if(pswd[i]=='0')
                pins[i] = 0; //if '0' was entered, 0 val is stored (a char can be encrypted as itself).
            else 
                pins[i] = pswd[i]; // ASCII values of chars passed to int array.
        }
        return pins ;
    }
} 

void encrypt(char * arguments[])
{
    int *d = pin(arguments);
    char mf = *arguments[3];

    if(mf == 'm')
    {
        char * msg = arguments[4];
        size_t length = strlen(msg);

        char ch; int j; // ch -----loop------> j

        for(size_t i =0; i < length ; i++) // For loop checks i val against number series, depending on match, a digit from pswd is used as shift val.
        {   
            ch = msg[i];

            if(ctln(i)==1)
                j = ch + d[2];

            else if(fib(i)==1)
                j = ch - d[4];

            else if(luc(i)==1)
                j = ch + d[0];

            else if(pent(i)==1)
                j = ch - d[6];

            else if(hex(i)==1)
                j = ch + d[3];

            else if(prm(i)==1)
                j = ch - d[7];

            else
            {
                if(i%2 == 0)
                    j = ch + d[1];
                else
                    j = ch - d[5];
            }

            printf("%d ", j);
        }
        printf("-999\n"); // Used to terminate input in decrypt()
    }

    else if(mf == 'f')
    {
        FILE * enf = fopen(arguments[4],"r");

        if (enf==NULL)
        {
            perror("Error accessing file ");
            exit(-1);
        }
        else
        {
            int ch;
            int j;
            size_t i = 0;

            while((ch = fgetc(enf)) != EOF)
            {
                if(ctln(i)==1)
                    j = ch + d[2];

                else if(fib(i)==1)
                    j = ch - d[4];

                else if(luc(i)==1)
                    j = ch + d[0];

                else if(pent(i)==1)
                    j = ch - d[6];

                else if(hex(i)==1)
                    j = ch + d[3];

                else if(prm(i)==1)
                    j = ch - d[7];

                else
                {
                    if(i%2 == 0)
                        j = ch + d[1];
                    else
                        j = ch - d[5];
                }

                printf("%d ", j);
                i++; // i++ to move to next elemnet of en[]
            }
            printf("-999\n"); 
            fclose(enf);
        }
    }
    else 
        error
}

void decrypt(char * arguments[])
{ 
    int * d_d = pin(arguments);    
    char mf = *arguments[3];

    if(mf == 'm')
    {        
        char *raw = arguments[4] ,** endptr = &raw;
        size_t i = 0;

        while(1)
        {
            int j_d = (int) strtol(raw,endptr,10);
            raw = *endptr; 

            if(j_d == -999)
                break;

            else
            { // all rules , reverses encryption with correct pswd
                int ch_d;

                if(ctln(i)==1)
                    ch_d = j_d - d_d[2];

                else if(fib(i)==1)
                    ch_d = j_d + d_d[4];

                else if(luc(i)==1)
                    ch_d = j_d - d_d[0];

                else if(pent(i)==1)
                    ch_d = j_d + d_d[6];

                else if(hex(i)==1)
                    ch_d = j_d - d_d[3];

                else if(prm(i)==1)
                    ch_d = j_d + d_d[7];

                else 
                {
                    if(i%2 == 0)
                        ch_d = j_d - d_d[1];
                    else
                        ch_d = j_d + d_d[5];			
                
                }
                putchar(ch_d);
                i++;
            }
        }
    }
    else if(mf == 'f')
    {
        FILE * enf = fopen(arguments[4],"r");

        if (enf == NULL)
        {
            perror("Error accessing file ");
            exit(-1);
        }

        else
        {
            int ch;
            int j;
            size_t i = 0;

            while((j = fgetc(enf)) != EOF)
            {
                fseek(enf,-1,SEEK_CUR);
                fscanf(enf,"%d",&j);

                if(j == -999)
                    break;

                else
                {
                    if(ctln(i)==1)
                        ch = j - d_d[2];

                    else if(fib(i)==1)
                        ch = j + d_d[4];

                    else if(luc(i)==1)
                        ch = j - d_d[0];

                    else if(pent(i)==1)
                        ch = j + d_d[6];

                    else if(hex(i)==1)
                        ch = j - d_d[3];

                    else if(prm(i)==1)
                        ch = j + d_d[7];

                    else
                    {
                        if(i%2 == 0)
                            ch = j - d_d[1];
                        else
                            ch = j + d_d[5];			
                    
                    }

                    putchar(ch);
                    i++;

                }
            }
            fclose(enf);
        }
    }
    else 
        error
}

int ctln(size_t x)
{
    size_t arr[]= {1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786};
    int con=0;

    for(size_t i =0; i < sizeof(arr)/sizeof(arr[0]); i++)
    { 
        // i < sizeof(arr)/sizeof(arr[0]) is necessary because sizeof() returns no. of bytes, not number of ints.
        if(arr[i] == x)
        {
            con = 1; 
            break;
        }
    }
    return con;
}

int fib(size_t x)
{
    size_t arr[]= {0, 3, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, 17711, 28657, 46368, 75025};
    int con=0;

    for(size_t i =0;i < sizeof(arr)/sizeof(arr[0]); i++)
    {
        if(arr[i] == x)
        {
            con = 1;
            break;
        }
    }
    return con;
}

int luc(size_t x)
{
    size_t arr[]= {4, 7, 11, 18, 29, 47, 76, 123, 199, 322, 521, 843, 1364, 2207, 3571, 5778, 9349, 15127, 24476, 39603, 64079};
    int con=0;

    for(size_t i =0; i < sizeof(arr)/sizeof(arr[0]); i++)
    {
        if(arr[i] == x)
        {
            con = 1;
            break;
        }
    }
    return con;
}

int pent(size_t x)
{
    size_t arr[]= {12, 22, 35, 51, 70, 92, 117, 145, 176, 210, 247, 287, 330, 376, 425, 477, 532, 590, 651, 715, 782, 852, 925, 1001, 1080, 1162, 1247, 1335, 1426, 1520, 1617, 1717, 1820, 1926, 2035, 2147, 2262, 2380, 2501, 2625, 2752, 2882, 3015 ,3151 ,3290 ,3432 ,3577 ,3725 ,3876 ,4030 ,4187 ,4347 ,4510 ,4676 ,4845 ,5017 ,5192 ,5370 ,5551 ,5735 ,5922 ,6112 ,6305 ,6501 ,6700 ,6902 ,7107 ,7315 ,7526 ,7740 ,7957 ,8177 ,8400 ,8626 ,8855 ,9087 ,9322 ,9560 ,9801 ,10045 ,10292 ,10542 ,10795 ,11051 ,11310 ,11572 ,11837 ,12105 ,12376 ,12650 ,12927 ,13207 ,13490 ,13776 ,14065 ,14357 ,14652 ,14950 ,15251 ,15555 ,15862 ,16172 ,16485 ,16801 ,17120 ,17442 ,17767 ,18095 ,18426 ,18760 ,19097 ,19437 ,19780 ,20126 ,20475 ,20827 ,21182 ,21540 ,21901 ,22265 ,22632 ,23002 ,23375 ,23751 ,24130 ,24512 ,24897 ,25285 ,25676 ,26070 ,26467 ,26867 ,27270 ,27676 ,28085 ,28497 ,28912 ,29330 ,29751 ,30175 ,30602 ,31032 ,31465 ,31901 ,32340 ,32782 ,33227 ,33675 ,34126 ,34580 ,35037 ,35497 ,35960 ,36426 ,36895 ,37367 ,37842 ,38320 ,38801 ,39285 ,39772 ,40262 ,40755 ,41251 ,41750 ,42252 ,42757 ,43265 ,43776 ,44290 ,44807 ,45327 ,45850 ,46376 ,46905 ,47437 ,47972 ,48510 ,49051 ,49595 ,50142 ,50692 ,51245 ,51801 ,52360 ,52922 ,53487 ,54055 ,54626 ,55200 ,55777 ,56357 ,56940 ,57526 ,58115 ,58707 ,59302 ,59900 ,60501 ,61105 ,61712 ,62322 ,62935 ,63551 ,64170 ,64792 ,65417 ,66045 ,66676 ,67310 ,67947 ,68587 ,69230 ,69876 ,70525 ,71177 ,71832 ,72490 ,73151 ,73815 ,74482 ,75152 ,75825 ,76501 ,77180 ,77862 ,78547 ,79235 ,79926 ,80620 ,81317 ,82017 ,82720 ,83426 ,84135 ,84847 ,85562 ,86280 ,87001 ,87725 ,88452 ,89182 ,89915 ,90651 ,91390 ,92132 ,92877 ,93625 ,94376 ,95130 ,95887 ,96647 ,97410 ,98176 ,98945 ,99717};
    int con=0;

    for(size_t i =0; i < sizeof(arr)/sizeof(arr[0]); i++)
    {
        if(arr[i] == x)
        {
            con = 1;
            break;
        }
    }
    return con;
}

int hex(size_t x)
{
    size_t arr[]= {0, 1, 6, 15, 28, 45, 66, 91, 120, 153, 190, 231, 276, 325, 378, 435, 496, 561, 630, 703, 780, 861, 946, 1035, 1128, 1225, 1326, 1431, 1540, 1653, 1770, 1891, 2016, 2145, 2278, 2415, 2556, 2701, 2850, 3003 ,3160 ,3321 ,3486 ,3655 ,3828 ,4005 ,4186 ,4371 ,4560 ,4753 ,4950 ,5151 ,5356 ,5565 ,5778 ,5995 ,6216 ,6441 ,6670 ,6903 ,7140 ,7381 ,7626 ,7875 ,8128 ,8385 ,8646 ,8911 ,9180 ,9453 ,9730 ,10011 ,10296 ,10585 ,10878 ,11175 ,11476 ,11781 ,12090 ,12403 ,12720 ,13041 ,13366 ,13695 ,14028 ,14365 ,14706 ,15051 ,15400 ,15753 ,16110 ,16471 ,16836 ,17205 ,17578 ,17955 ,18336 ,18721 ,19110 ,19503 ,19900 ,20301 ,20706 ,21115 ,21528 ,21945 ,22366 ,22791 ,23220 ,23653 ,24090 ,24531 ,24976 ,25425 ,25878 ,26335 ,26796 ,27261 ,27730 ,28203 ,28680 ,29161 ,29646 ,30135 ,30628 ,31125 ,31626 ,32131 ,32640 ,33153 ,33670 ,34191 ,34716 ,35245 ,35778 ,36315 ,36856 ,37401 ,37950 ,38503 ,39060 ,39621 ,40186 ,40755 ,41328 ,41905 ,42486 ,43071 ,43660 ,44253 ,44850 ,45451 ,46056 ,46665 ,47278 ,47895 ,48516 ,49141 ,49770 ,50403 ,51040 ,51681 ,52326 ,52975 ,53628 ,54285 ,54946 ,55611 ,56280 ,56953 ,57630 ,58311 ,58996 ,59685 ,60378 ,61075 ,61776 ,62481 ,63190 ,63903 ,64620 ,65341 ,66066 ,66795 ,67528 ,68265 ,69006 ,69751 ,70500 ,71253 ,72010 ,72771 ,73536 ,74305 ,75078 ,75855 ,76636 ,77421 ,78210 ,79003 ,79800 ,80601 ,81406 ,82215 ,83028 ,83845 ,84666 ,85491 ,86320 ,87153 ,87990 ,88831 ,89676 ,90525 ,91378 ,92235 ,93096 ,93961 ,94830 ,95703 ,96580 ,97461 ,98346 ,99235};
    int con=0;

    for(size_t i =0; i < sizeof(arr)/sizeof(arr[0]); i++)
    {
        if(arr[i] == x)
        {
            con = 1;
            break;
        }
    }
    return con;
}

int prm(size_t x)
{
    size_t arr[]= {7,13,23,29,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199,211,223,227,229,233,239,241,251,257,263,269,271,277,281,283,293,307,311,313,317,331,337,347,349,353,359,367,373,379,383,389,397,401,409,419,421,431,433,439,443,449,457,461,463,467,479,487,491,499,503,509,521,523,541,547,557,563,569,571,577,587,593,599,601,607,613,617,619,631,641,643,647,653,659,661,673,677,683,691,701,709,719,727,733,739,743,751,757,761,769,773,787,797,809,811,821,823,827,829,839,853,857,859,863,877,881,883,887,907,911,919,929,937,941,947,953,967,971,977,983,991,997,1009,1013,1019,1021,1031,1033,1039,1049,1051,1061,1063,1069,1087,1091,1093,1097,1103,1109,1117,1123,1129,1151,1153,1163,1171,1181,1187,1193,1201,1213,1217,1223,1229,1231,1237,1249,1259,1277,1279,1283,1289,1291,1297,1301,1303,1307,1319,1321,1327,1361,1367,1373,1381,1399,1409,1423,1427,1429,1433,1439,1447,1451,1453,1459,1471,1481,1483,1487,1489,1493,1499,1511,1523,1531,1543,1549,1553,1559,1567,1571,1579,1583,1597,1601,1607,1609,1613,1619,1621,1627,1637,1657,1663,1667,1669,1693,1697,1699,1709,1721,1723,1733,1741,1747,1753,1759,1777,1783,1787,1789,1801,1811,1823,1831,1847,1861,1867,1871,1873,1877,1879,1889,1901,1907,1913,1931,1933,1949,1951,1973,1979,1987,1993,1997,1999,2003,2011,2017,2027,2029,2039,2053,2063,2069,2081,2083,2087,2089,2099,2111,2113,2129,2131,2137,2141,2143,2153,2161,2179,2203,2207,2213,2221,2237,2239,2243,2251,2267,2269,2273,2281,2287,2293,2297,2309,2311,2333,2339,2341,2347,2351,2357,2371,2377,2381,2383,2389,2393,2399,2411,2417,2423,2437,2441,2447,2459,2467,2473,2477,2503,2521,2531,2539,2543,2549,2551,2557,2579,2591,2593,2609,2617,2621,2633,2647,2657,2659,2663,2671,2677,2683,2687,2689,2693,2699,2707,2711,2713,2719,2729,2731,2741,2749,2753,2767,2777,2789,2791,2797,2801,2803,2819,2833,2837,2843,2851,2857,2861,2879,2887,2897,2903,2909,2917,2927,2939,2953,2957,2963,2969,2971,2999,3001,30011, 30013, 30029, 30047, 30059, 30071, 30089, 30091, 30097, 30103, 30109, 30113, 30119, 30133, 30137, 30139, 30161, 30169, 30181, 30187, 30197, 30203, 30211, 30223, 30241, 30253, 30259, 30269, 30271, 30293, 30307, 30313, 30319, 30323, 30341, 30347, 30367, 30389, 30391, 30403, 30427, 30431, 30449, 30467, 30469, 30491, 30493, 30497, 30509, 30517, 30529, 30539, 30553, 30557, 30559, 30577, 30593, 30631, 30637, 30643, 30649, 30661, 30671, 30677, 30689, 30697, 30703, 30707, 30713, 30727, 30757, 30763, 30773, 30781, 30803, 30809, 30817, 30829, 30839, 30841, 30851, 30853, 30859, 30869, 30871, 30881, 30893, 30911, 30931, 30937, 30941, 30949, 30971, 30977, 30983, 31013, 31019, 31033, 31039, 31051, 31063, 31069, 31079, 31081, 31091, 31121, 31123, 31139, 31147, 31151, 31153, 31159, 31177, 31181, 31183, 31189, 31193, 31219, 31223, 31231, 31237, 31247, 31249, 31253, 31259, 31267, 31271, 31277, 31307, 31319, 31321, 31327, 31333, 31337, 31357, 31379, 31387, 31391, 31393, 31397, 31469, 31477, 31481, 31489, 31511, 31513, 31517, 31531, 31541, 31543, 31547, 31567, 31573, 31583, 31601, 31607, 31627, 31643, 31649, 31657, 31663, 31667, 31687, 31699, 31721, 31723, 31727, 31729, 31741, 31751, 31769, 31771, 31793, 31799, 31817, 31847, 31849, 31859, 31873, 31883, 31891, 31907, 31957, 31963, 31973, 31981, 31991, 32003, 32009, 32027, 32029, 32051, 32057, 32059, 32063, 32069, 32077, 32083, 32089, 32099, 32117, 32119, 32141, 32143, 32159, 32173, 32183, 32189, 32191, 32203, 32213, 32233, 32237, 32251, 32257, 32261, 32297, 32299, 32303, 32309, 32321, 32323, 32327, 32341, 32353, 32359, 32363, 32369, 32371, 32377, 32381, 32401, 32411, 32413, 32423, 32429, 32441, 32443, 32467, 32479, 32491, 32497, 32503, 32507, 32531, 32533, 32537, 32561, 32563, 32569, 32573, 32579, 32587, 32603, 32609, 32611, 32621, 32633, 32647, 32653, 32687, 32693, 32707, 32713, 32717, 32719, 32749, 32771, 32779, 32783, 32789, 32797, 32801, 32803, 32831, 32833, 32839, 32843, 32869, 32887, 32909, 32911, 32917, 32933, 32939, 32941, 32957, 32969, 32971, 32983, 32987, 32993, 32999, 33013, 33023, 33029, 33037, 33049, 33053, 33071, 33073, 33083, 33091, 33107, 33113, 33119, 33149, 33151, 33161, 33179, 33181, 33191, 33199, 33203, 33211, 33223, 33247, 33287, 33289, 33301, 33311, 33317, 33329, 33331, 33343, 33347, 33349, 33353, 33359, 33377, 33391, 33403, 33409, 33413, 33427, 33457, 33461, 33469, 33479, 33487, 33493, 33503, 33521, 33529, 33533, 33547, 33563, 33569, 33577, 33581, 33587, 33589, 33599, 33601, 33613, 33617, 33619, 33623, 33629, 33637, 33641, 33647, 33679, 33703, 33713, 33721, 33739, 33749, 33751, 33757, 33767, 33769, 33773, 33791, 33797, 33809, 33811, 33827, 33829, 33851, 33857, 33863, 33871, 33889, 33893, 33911, 33923, 33931, 33937, 33941, 33961, 33967, 33997, 34019, 34031, 34033, 34039, 34057, 34061, 34123, 34127, 34129, 34141, 34147, 34157, 34159, 34171, 34183, 34211, 34213, 34217, 34231, 34253, 34259, 34261, 34267, 34273, 34283, 34297, 34301, 34303, 34313, 34319, 34327, 34337, 34351, 34361, 34367, 34369, 34381, 34403, 34421, 34429, 34439, 34457, 34469, 34471, 34483, 34487, 34499, 34501, 34511, 34513, 34519, 34537, 34543, 34549, 34583, 34589, 34591, 34603, 34607, 34613, 34631, 34649, 34651, 34667, 34673, 34679, 34687, 34693, 34703, 34721, 34729, 34739, 34747, 34757, 34759, 34763, 34781, 34807, 34819, 34841, 34843, 34847, 34849, 34871, 34877, 34883, 34897, 34913, 34919, 34939, 34949, 34961, 34963, 34981, 35023, 35027, 35051, 35053, 35059, 35069, 35081, 35083, 35089, 35099, 35107, 35111, 35117, 35129, 35141, 35149, 35153, 35159, 35171, 35201, 35221, 35227, 35251, 35257, 35267, 35279, 35281, 35291, 35311, 35317, 35323, 35327, 35339, 35353, 35363, 35381, 35393, 35401, 35407, 35419, 35423, 35437, 35447, 35449, 35461, 35491, 35507, 35509, 35521, 35527, 35531, 35533, 35537, 35543, 35569, 35573, 35591, 35593, 35597, 35603, 35617, 35671, 35677, 35729, 35731, 35747, 35753, 35759, 35771, 35797, 35801, 35803, 35809, 35831, 35837, 35839, 35851, 35863, 35869, 35879, 35897, 35899, 35911, 35923, 35933, 35951, 35963, 35969, 35977, 35983, 35993, 35999, 36007, 36011, 36013, 36017, 36037, 36061, 36067, 36073, 36083, 36097, 36107, 36109, 36131, 36137, 36151, 36161, 36187, 36191, 36209, 36217, 36229, 36241, 36251, 36263, 36269, 36277, 36293, 36299, 36307, 36313, 36319, 36341, 36343, 36353, 36373, 36383, 36389, 36433, 36451, 36457, 36467, 36469, 36473, 36479, 36493, 36497, 36523, 36527, 36529, 36541, 36551, 36559, 36563, 36571, 36583, 36587, 36599, 36607, 36629, 36637, 36643, 36653, 36671, 36677, 36683, 36691, 36697, 36709, 36713, 36721, 36739, 36749, 36761, 36767, 36779, 36781, 36787, 36791, 36793, 36809, 36821, 36833, 36847, 36857, 36871, 36877, 36887, 36899, 36901, 36913, 36919, 36923, 36929, 36931, 36943, 36947, 36973, 36979, 36997, 37003, 37013, 37019, 37021, 37039, 37049, 37057, 37061, 37087, 37097, 37117, 37123, 37139, 37159, 37171, 37181, 37189, 37199, 37201, 37217, 37223, 37243, 37253, 37273, 37277, 37307, 37309, 37313, 37321, 37337, 37339, 37357, 37361, 37363, 37369, 37379, 37397, 37409, 37423, 37441, 37447, 37463, 37483, 37489, 37493, 37501, 37507, 37511, 37517, 37529, 37537, 37547, 37549, 37561, 37567, 37571, 37573, 37579, 37589, 37591, 37607, 37619, 37633, 37643, 37649, 37657, 37663, 37691, 37693, 37699, 37717, 37747, 37781, 37783, 37799, 37811, 37813, 37831, 37847, 37853, 37861, 37871, 37879, 37889, 37897, 37907, 37951, 37957, 37963, 37967, 37987, 37991, 37993, 37997, 38011, 38039, 38047, 38053, 38069, 38083, 38113, 38119, 38149, 38153, 38167, 38177, 38183, 38189, 38197, 38201, 38219, 38231, 38237, 38239, 38261, 38273, 38281, 38287, 38299, 38303, 38317, 38321, 38327, 38329, 38333, 38351, 38371, 38377, 38393, 38431, 38447, 38449, 38453, 38459, 38461, 38501, 38543, 38557, 38561, 38567, 38569, 38593, 38603, 38609, 38611, 38629, 38639, 38651, 38653, 38669, 38671, 38677, 38693, 38699, 38707, 38711, 38713, 38723, 38729, 38737, 38747, 38749, 38767, 38783, 38791, 38803, 38821, 38833, 38839, 38851, 38861, 38867, 38873, 38891, 38903, 38917, 38921, 38923, 38933, 38953, 38959, 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86341, 86351, 86353, 86357, 86369, 86371, 86381, 86389, 86399, 86413, 86423, 86441, 86453, 86461, 86467, 86477, 86491, 86501, 86509, 86531, 86533, 86539, 86561, 86573, 86579, 86587, 86599, 86627, 86629, 86677, 86689, 86693, 86711, 86719, 86729, 86743, 86753, 86767, 86771, 86783, 86813, 86837, 86843, 86851, 86857, 86861, 86869, 86923, 86927, 86929, 86939, 86951, 86959, 86969, 86981, 86993, 87011, 87013, 87037, 87041, 87049, 87071, 87083, 87103, 87107, 87119, 87121, 87133, 87149, 87151, 87179, 87181, 87187, 87211, 87221, 87223, 87251, 87253, 87257, 87277, 87281, 87293, 87299, 87313, 87317, 87323, 87337, 87359, 87383, 87403, 87407, 87421, 87427, 87433, 87443, 87473, 87481, 87491, 87509, 87511, 87517, 87523, 87539, 87541, 87547, 87553, 87557, 87559, 87583, 87587, 87589, 87613, 87623, 87629, 87631, 87641, 87643, 87649, 87671, 87679, 87683, 87691, 87697, 87701, 87719, 87721, 87739, 87743, 87751, 87767, 87793, 87797, 87803, 87811, 87833, 87853, 87869, 87877, 87881, 87887, 87911, 87917, 87931, 87943, 87959, 87961, 87973, 87977, 87991, 88001, 88003, 88007, 88019, 88037, 88069, 88079, 88093, 88117, 88129, 88169, 88177, 88211, 88223, 88237, 88241, 88259, 88261, 88289, 88301, 88321, 88327, 88337, 88339, 88379, 88397, 88411, 88423, 88427, 88463, 88469, 88471, 88493, 88499, 88513, 88523, 88547, 88589, 88591, 88607, 88609, 88643, 88651, 88657, 88661, 88663, 88667, 88681, 88721, 88729, 88741, 88747, 88771, 88789, 88793, 88799, 88801, 88807, 88811, 88813, 88817, 88819, 88843, 88853, 88861, 88867, 88873, 88883, 88897, 88903, 88919, 88937, 88951, 88969, 88993, 88997, 89003, 89009, 89017, 89021, 89041, 89051, 89057, 89069, 89071, 89083, 89087, 89101, 89107, 89113, 89119, 89123, 89137, 89153, 89189, 89203, 89209, 89213, 89227, 89231, 89237, 89261, 89269, 89273, 89293, 89303, 89317, 89329, 89363, 89371, 89381, 89387, 89393, 89399, 89413, 89417, 89431, 89443, 89449, 89459, 89477, 89491, 89501, 89513, 89519, 89521, 89527, 89533, 89561, 89563, 89567, 89591, 89597, 89599, 89603, 89611, 89627, 89633, 89653, 89657, 89659, 89669, 89671, 89681, 89689, 89753, 89759, 89767, 89779, 89783, 89797, 89809, 89819, 89821, 89833, 89839, 89849, 89867, 89891, 89897, 89899, 89909, 89917, 89923, 89939, 89959, 89963, 89977, 89983, 89989, 90001, 90007, 90011, 90017, 90019, 90023, 90031, 90053, 90059, 90067, 90071, 90073, 90089, 90107, 90121, 90127, 90149, 90163, 90173, 90187, 90191, 90197, 90199, 90203, 90217, 90227, 90239, 90247, 90263, 90271, 90281, 90289, 90313, 90353, 90359, 90371, 90373, 90379, 90397, 90401, 90403, 90407, 90437, 90439, 90469, 90473, 90481, 90499, 90511, 90523, 90527, 90529, 90533, 90547, 90583, 90599, 90617, 90619, 90631, 90641, 90647, 90659, 90677, 90679, 90697, 90703, 90709, 90731, 90749, 90787, 90793, 90803, 90821, 90823, 90833, 90841, 90847, 90863, 90887, 90901, 90907, 90911, 90917, 90931, 90947, 90971, 90977, 90989, 90997, 91009, 91019, 91033, 91079, 91081, 91097, 91099, 91121, 91127, 91129, 91139, 91141, 91151, 91153, 91159, 91163, 91183, 91193, 91199, 91229, 91237, 91243, 91249, 91253, 91283, 91291, 91297, 91303, 91309, 91331, 91367, 91369, 91373, 91381, 91387, 91393, 91397, 91411, 91423, 91433, 91453, 91457, 91459, 91463, 91493, 91499, 91513, 91529, 91541, 91571, 91573, 91577, 91583, 91591, 91621, 91631, 91639, 91673, 91691, 91703, 91711, 91733, 91753, 91757, 91771, 91781, 91801, 91807, 91811, 91813, 91823, 91837, 91841, 91867, 91873, 91909, 91921, 91939, 91943, 91951, 91957, 91961, 91967, 91969, 91997, 92003, 92009, 92033, 92041, 92051, 92077, 92083, 92107, 92111, 92119, 92143, 92153, 92173, 92177, 92179, 92189, 92203, 92219, 92221, 92227, 92233, 92237, 92243, 92251, 92269, 92297, 92311, 92317, 92333, 92347, 92353, 92357, 92363, 92369, 92377, 92381, 92383, 92387, 92399, 92401, 92413, 92419, 92431, 92459, 92461, 92467, 92479, 92489, 92503, 92507, 92551, 92557, 92567, 92569, 92581, 92593, 92623, 92627, 92639, 92641, 92647, 92657, 92669, 92671, 92681, 92683, 92693, 92699, 92707, 92717, 92723, 92737, 92753, 92761, 92767, 92779, 92789, 92791, 92801, 92809, 92821, 92831, 92849, 92857, 92861, 92863, 92867, 92893, 92899, 92921, 92927, 92941, 92951, 92957, 92959, 92987, 92993, 93001, 93047, 93053, 93059, 93077, 93083, 93089, 93097, 93103, 93113, 93131, 93133, 93139, 93151, 93169, 93179, 93187, 93199, 93229, 93239, 93241, 93251, 93253, 93257, 93263, 93281, 93283, 93287, 93307, 93319, 93323, 93329, 93337, 93371, 93377, 93383, 93407, 93419, 93427, 93463, 93479, 93481, 93487, 93491, 93493, 93497, 93503, 93523, 93529, 93553, 93557, 93559, 93563, 93581, 93601, 93607, 93629, 93637, 93683, 93701, 93703, 93719, 93739, 93761, 93763, 93787, 93809, 93811, 93827, 93851, 93871, 93887, 93889, 93893, 93901, 93911, 93913, 93923, 93937, 93941, 93949, 93967, 93971, 93979, 93983, 93997, 94007, 94009, 94033, 94049, 94057, 94063, 94079, 94099, 94109, 94111, 94117, 94121, 94151, 94153, 94169, 94201, 94207, 94219, 94229, 94253, 94261, 94273, 94291, 94307, 94309, 94321, 94327, 94331, 94343, 94349, 94351, 94379, 94397, 94399, 94421, 94427, 94433, 94439, 94441, 94447, 94463, 94477, 94483, 94513, 94529, 94531, 94541, 94543, 94547, 94559, 94561, 94573, 94583, 94597, 94603, 94613, 94621, 94649, 94651, 94687, 94693, 94709, 94723, 94727, 94747, 94771, 94777, 94781, 94789, 94793, 94811, 94819, 94823, 94837, 94841, 94847, 94849, 94873, 94889, 94903, 94907, 94933, 94949, 94951, 94961, 94993, 94999, 95003, 95009, 95021, 95027, 95063, 95071, 95083, 95087, 95089, 95093, 95101, 95107, 95111, 95131, 95143, 95153, 95177, 95189, 95191, 95203, 95213, 95219, 95231, 95233, 95239, 95257, 95261, 95267, 95273, 95279, 95287, 95311, 95317, 95327, 95339, 95369, 95383, 95393, 95401, 95413, 95419, 95429, 95441, 95443, 95461, 95467, 95471, 95479, 95483, 95507, 95527, 95531, 95539, 95549, 95561, 95569, 95581, 95597, 95603, 95617, 95621, 95629, 95633, 95651, 95701, 95707, 95713, 95717, 95723, 95731, 95737, 95747, 95773, 95783, 95789, 95791, 95801, 95803, 95813, 95819, 95857, 95869, 95873, 95881, 95891, 95911, 95917, 95923, 95929, 95947, 95957, 95959, 95971, 95987, 95989, 96001, 96013, 96017, 96043, 96053, 96059, 96079, 96097, 96137, 96149, 96157, 96167, 96179, 96181, 96199, 96211, 96221, 96223, 96233, 96259, 96263, 96269, 96281, 96289, 96293, 96323, 96329, 96331, 96337, 96353, 96377, 96401, 96419, 96431, 96443, 96451, 96457, 96461, 96469, 96479, 96487, 96493, 96497, 96517, 96527, 96553, 96557, 96581, 96587, 96589, 96601, 96643, 96661, 96667, 96671, 96697, 96703, 96731, 96737, 96739, 96749, 96757, 96763, 96769, 96779, 96787, 96797, 96799, 96821, 96823, 96827, 96847, 96851, 96857, 96893, 96907, 96911, 96931, 96953, 96959, 96973, 96979, 96989, 96997, 97001, 97003, 97007, 97021, 97039, 97073, 97081, 97103, 97117, 97127, 97151, 97157, 97159, 97169, 97171, 97177, 97187, 97213, 97231, 97241, 97259, 97283, 97301, 97303, 97327, 97367, 97369, 97373, 97379, 97381, 97387, 97397, 97423, 97429, 97441, 97453, 97459, 97463, 97499, 97501, 97511, 97523, 97547, 97549, 97553, 97561, 97571, 97577, 97579, 97583, 97607, 97609, 97613, 97649, 97651, 97673, 97687, 97711, 97729, 97771, 97777, 97787, 97789, 97813, 97829, 97841, 97843, 97847, 97849, 97859, 97861, 97871, 97879, 97883, 97919, 97927, 97931, 97943, 97961, 97967, 97973, 97987, 98009, 98011, 98017, 98041, 98047, 98057, 98081, 98101, 98123, 98129, 98143, 98179, 98207, 98213, 98221, 98227, 98251, 98257, 98269, 98297, 98299, 98317, 98321, 98323, 98327, 98347, 98369, 98377, 98387, 98389, 98407, 98411, 98419, 98429, 98443, 98453, 98459, 98467, 98473, 98479, 98491, 98507, 98519, 98533, 98543, 98561, 98563, 98573, 98597, 98621, 98627, 98639, 98641, 98663, 98669, 98689, 98711, 98713, 98717, 98729, 98731, 98737, 98773, 98779, 98801, 98807, 98809, 98837, 98849, 98867, 98869, 98873, 98887, 98893, 98897, 98899, 98909, 98911, 98927, 98929, 98939, 98947, 98953, 98963, 98981, 98993, 98999, 99013, 99017, 99023, 99041, 99053, 99079, 99083, 99089, 99103, 99109, 99119, 99131, 99133, 99137, 99139, 99149, 99173, 99181, 99191, 99223, 99233, 99241, 99251, 99257, 99259, 99277, 99289, 99317, 99347, 99349, 99367, 99371, 99377, 99391, 99397, 99401, 99409, 99431, 99439, 99469, 99487, 99497, 99523, 99527, 99529, 99551, 99559, 99563, 99571, 99577, 99581, 99607, 99611, 99623, 99643, 99661, 99667, 99679, 99689, 99707, 99709, 99713, 99719, 99721, 99733, 99761, 99767, 99787, 99793, 99809, 99817, 99823, 99829, 99833, 99839, 99859, 99871, 99877, 99881, 99901, 99907, 99923, 99929, 99961, 99971, 99989, 99991};
    int con=0;

    for(size_t i =0;i < sizeof(arr)/sizeof(arr[0]); i++)
    {
        if(arr[i] == x)
        {
            con = 1;
            break;
        }
    }
    return con;
}

// Special thanks to: 
/*  1) @MikeCAT & @SouravGhosh for [https://stackoverflow.com/questions/63269307/how-to-print-a-large-incompletely-filled-array-only-till-last-entered-int-in-c] ;
    2) @RobertHarvey & @chux-ReinstateMonica for [https://stackoverflow.com/questions/63287497/weird-characters-randomly-appearing-when-converting-int-arr-to-string-in-c-with] ;
    3) @Martinjames & @PaulOgive for [https://stackoverflow.com/questions/63314287/if-else-if-else-statement-not-working-as-expected] ;
    4) @MikeCAT for [https://stackoverflow.com/questions/63317914/while-loops-and-arrays-causing-very-odd-behaviour-maybe-a-memory-mixup-c-lan] ;
    5) GeeksForGeeks & https://www.free-online-calculator-use.com/prime-number-generator.html for sequence generation ;
    6) Yashavant P Kanetkar for teaching me the C language (Let Us C, 10th edition) ;
*/