Day 3 Assignment

/*–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––*/

/* This program uses linear interpolation to */

/* compute the freezing temperature of seawater. */

#include <stdio.h>

#include <math.h>

int main(void)

{

/* Declare variables. */

double a, f_a, b, f_b, c, f_c, t_c;

/* Get user input from the keyboard. */

printf("Use ppt for salinity values. \n");

printf("Use degrees F for temperatures. \n");

printf("Enter first salinity and freezing temperature: \n");

scanf("%lf %lf",&a,&f_a);

printf("Enter second salinity and freezing temperature: \n");

scanf("%lf %lf",&c,&f_c);

printf("Enter new salinity: \n");

scanf("%lf",&b);

// Use linear interpolation to compute new freezing temperature.

f_b = f_a + (b-a)/(c-a)*(f_c - f_a);

// Use value of new freezing temperature to convert into Centigrade.

t_c = (5*f_b/9) - 32;

/* Print new freezing temperature. */

printf("New freezing temperature in degrees C: %4.1f \n",t_c);

return 0; /* Exit program. */

}

/*–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––*/