/* File: if4.c

  Testing if statements.
  Using == with float has some difficulties with round off errors.
*/

#include <stdio.h>

int main() {

   float n, m, quotient ;

   n = 17.0 ;
   m = (.0000001 * 1000000) - 0.1 ; // should be zero

   printf("m = %.20f\n", m) ;

   if (m == 0.0) {   // NOTE TWO = in ==
      printf("Don't divide by zero!\n") ;
   } else {
      quotient = n / m ;
      printf("%f divided by %f is %f (floating point division)\n",
         n, m, quotient) ;
   }

   return 0 ;
}