convert_fah_to_cel.c

#include <stdio.h>

float convFahtCel(float fah);

int main() {
        float fah;
        printf("Enter fahreheit: ");
        scanf("%f", &fah);
        printf("Celcius: %f", convFahtCel(fah));
        return 0;
}

float convFahtCel(float fah) {
        return 5.0 / 9 * (fah - 32);
}