Round Robin.c

#include<stdio.h>  
#include<conio.h>  
// Turnaround Time (TAT):
// It is the time interval from the time of submission of a process to the time of the completion of the process.
// Turn Around Time = Completion Time - Arrival Time

// Waiting Time (WT):
// The time spent by a process waiting in the ready queue for getting the CPU.
// Waiting Time = Turn Around Time - Burst Time
void main()  
{  
    // initlialize the variable name  
    int i, n, time=0,count=0, y, time_quantum, wt=0, tat=0, at[10], bt[10], temp[10];  
    float avg_wt, avg_tat;  
    printf(" Total number of process in the system: ");  
    scanf("%d", &n);  
    y = n; // copy of n  
  
// Use for loop to enter the details of the process like Arrival time and the Burst Time  
for(i=0; i<n; i++)  
{  
    printf("\n Enter the Arrival and Burst time of the Process[%d]\n", i+1);  
    printf(" Arrival time is: \t");  // Accept arrival time  
    scanf("%d", &at[i]);  
    printf(" \nBurst time is: \t"); // Accept the Burst time  
    scanf("%d", &bt[i]);  
    temp[i] = bt[i]; // store the burst time in temp array  
}  
// Accept the Time qunat  
printf("Enter the Time Quantum for the process: \t");  
scanf("%d", &time_quantum);  
// Display the process No, burst time, Turn Around Time and the waiting time  
printf("\n Process No \t\t Burst Time \t\t TAT \t\t Waiting Time ");  
for(time=0, i = 0; y!=0; )  
{  
if(temp[i] <= time_quantum && temp[i] > 0) // define the conditions   
{  
    time = time + temp[i];  
    temp[i] = 0;  
    count=1;  
    }     
    else if(temp[i] > 0)  
    {  
        temp[i] = temp[i] - time_quantum;  
        time = time + time_quantum;    
    }  
    if(temp[i]==0 && count==1)  
    {  
        y--; //decrement the process no.  
        printf("\nProcess No[%d] \t\t %d\t\t\t\t %d\t\t\t %d", i+1, bt[i], time-at[i], time-at[i]-bt[i]);  
        tat+=time-at[i];  
        wt += tat-bt[i];  
        count =0;     
    }    
    if(at[i+1]<=time) // If the arrival time of next proc is less than current time 
    {  
        i++;  
    }  
    else  
    {  
        i=0;  
    }  
}  
// represents the average waiting time and Turn Around time  
avg_wt = wt * 1.0/n;  
avg_tat = tat * 1.0/n;  
printf("\n Average Turn Around Time: \t%f", avg_wt);  
printf("\n Average Waiting Time: \t%f", avg_tat);  
getch();  
}