#include <stdio.h>

int main() {

  double a = -0.0;
  double b = 0.0;

  printf("a = %+.2lf\n", a);
  printf("b = %+.2lf\n", b);
  printf("a - b = %+.2lf\n", a - b);
  printf("b - a = %+.2lf\n", b - a);

  return 0;
}

a = -0.00
b = +0.00
a - b = -0.00
b - a = +0.00