#include <stdio.h>

#include <stdlib.h>

int main() {
    double temp, C, F;
    char c;
    printf(" Input temperature and unit respectively, enter f if unit is fahrenheit and c if celsius:\n");
    scanf("%lf %c", & temp, & c);
    if (c == 'f') {
        C = (1. / 9.) * (5 * temp - 160);
        printf("The temperature is %lf celsius ", c);
    } else if (c == 'c') {
        F = (1. / 5.) * (9. * temp + 160);
        printf("The temperature is %lf fahrenheit ", F);
    } else printf("Invalid input");

}