ex43.c

#include <stdio.h>
#include <stdlib.h>
#include "comphys.h"
#include "comphys.c"


int main(){

  int ni;
  int i = 0;
  int j;
  int x;
  double y;
  //double m;

  
  int xn[79] = {50,100,150,200,250,300,350,400,450,500,550,600,650,700,750,800,850,900,905,910,915,920,925,930,935,940,945,950,955,960,965,970,975,980,985,990,995,1000,1005,1010,1015,1020,1025,1030,1035,1040,1045,1050,1055,1060,1065,1070,1075,1080,1085,1090,1095,1100,1150,1200,1250,1300,1350,1400,1450,1500,1550,1600,1650,1700,1750,1800,1850,1900,1950,2000,2050,2100,2150};

  double yn[79] = {32.88, 45.82,53.98,60.07,64.98,69.11,72.70,75.88,78.74,81.34,83.73,85.95,88.02,89.96,91.78,93.51,95.15, 96.71, 96.87, 97.02, 97.17, 97.32, 97.47, 97.62, 97.76,97.91, 98.06, 98.21, 98.35, 98.50, 98.64, 98.78, 98.93, 99.07, 99.21, 99.35, 99.49, 99.63, 99.77, 99.91,    100.05,    100.19,    100.32,    100.46,    100.60, 100.73,    100.87, 101.00,    101.14,    101.27,    101.40,    101.54,    101.67,    101.80,    101.93,    102.06,    102.19,    102.32,    103.59,    104.81,    105.99,    107.14,    108.25,    109.32,    110.36,    111.38,    112.37,    113.33,    114.26,    115.18,    116.07,    116.94,    117.79,    118.63,    119.44,    120.24,    121.02,    121.79,    122.54};

  printf("Enter a pressure between 50 and 2150 mbar to return\nthe boiling temperature of water at that pressure.\n > ");
  ni = scanf("%d",&x);
  while(x > 2150 || x < 50){
    printf("Please enter a value between 50 and 2150 mbar\n > ");
    ni = scanf("%d",&x);
  }

  for(j=0;j<=78;j++){
    if(x > xn[j] && x < xn[j+1]){
      i=j;
      break;
    }else if(x == xn[j]){
      i=j;
      printf("BP (Celcius) = %3.2lf\n",yn[i]);
      exit(0);
    }
  }

  //m = (yn[i+1] - yn[i])/(xn[i+1] - xn[i]);
  y = yn[i] + (yn[i+1] - yn[i])*(x - xn[i])/(xn[i+1] - xn[i]);
  
  
  printf("BP (Celcius) = %3.2lf\n",y);

  //free_dvector(yn,1,79);
  //free_ivector(xn,1,79);
  //free_dmatrix(z,1,2,1,79);
  return(0);
}