Temperature Converter

C / Other

#include <stdio.h>
#include <assert.h>

// declare functions
double c_to_f(double temp);
double f_to_c(double temp);

int main(void) {
    double temp;
    char unit;

    scanf("%lf %c", &temp, &unit);
    if (unit == 'C') {
        printf("%.1f F", c_to_f(temp));

    } else if (unit == 'F') {
        printf("%.1f C", f_to_c(temp));
    }
}

// define functions

// convert C to F
double c_to_f(double temp) {
    return ((9.0 / 5) * temp + 32);
}

// convert F to C
double f_to_c(double temp) {
    return ((5.0 / 9) * (temp - 32));
}

// ./main
// 40 C
// 104.0 F