C Program that converts centigrade to fahrenheit?

Question

Determine the set of inputs that will lead to SIGFPE (floating point exception) being triggered in following C program?

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv)
{
    if(argc != 3 || !atoi(argv[2]))
        return 1;
    return abs(atoi(argv[1])) / atoi(argv[2]);
}

Answer 1

Formula

(F-32)/9 = C/5
or 
F = 9C/5 + 32 

Sample Code

main()
{
  float c;
  scanf("%f", &c);
  printf("%f C = %f F", c, (9*C/5 + 32));
}