3

Rounding error

  1. #include <stdio.h>
  2.  
  3. main() {
  4.     double x = 1000/3.0;
  5.     double y = x - 333.0;
  6.     double z = 3*y - 1.0;
  7.     printf("x=%f\n", x);
  8.     printf("y=%f\n", y);
  9.     if ( z == 0 )
  10.         printf("z=0\n");
  11.     else
  12.         printf("z=%.15lf\n", z);
  13. }
$ gcc -o round round.c
$ ./round 
x=333.333333
y=0.333333
z=-0.000000000000057

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