#include <stdio.h>
//c = 5 * (f - 32) / 9 

int main(void) { 
    float c;  
    for (int i = -100; i  <= 100; i++) {
                 c = 5 * (i - 32) /9;
                 printf("Fahr: %d, Celsius %2f\n", i, c); 
    } 
    return 0;
 }