c_ch01_ex15.c

/*Exercise 1.15. Rewrite the temperature conversion program of Section 1.2 to use a function for conversion.*/
#include <stdio.h>
#define UPPER   300
#define LOWER   0
#define STEP    20
void fahrconv (float celsius, int upper, int lower, int step);
main()
{
        char *f = "Faher", *c = "Celsi";
        float lower = LOWER, upper = UPPER, step = STEP, celsius;
        printf("%6s %5s\n", c, f);
        fahrconv(celsius, upper, lower, step);
        return 0;
}
void fahrconv (float celsius, int upper, int lower, int step) {
        float fahr;
        while (celsius <= UPPER) {
                fahr = ((celsius * 9.0)/5.0) + 32.0;
                printf("%6.1f %5.0f\n", celsius, fahr);
                celsius = celsius + step;
        }
}