#include <stdio.h>
main()
{
float fahr, celsius;
int lower, upper,step;
lower=0;
upper=300;
step=20;

fahr=lower;
while(fahr<=upper){
celsius = (5.0/9.0) * (fahr-32.0);
printf("%3.0f %6.1f\n", fahr , celsius);
fahr=fahr+step;
}
}

  0  -17.8
 20   -6.7
 40    4.4
 60   15.6
 80   26.7
100   37.8
120   48.9
140   60.0
160   71.1
180   82.2
200   93.3
220  104.4
240  115.6
260  126.7
280  137.8
300  148.9

Exited: ExitFailure 11