#include<stdio.h>
int main(void)
{
double a,b;
printf("Enter a\&b:\n");
while(scanf("%lf%lf",&a,&b)==2)
{
printf("%.3g - %.3g / %.3g * %.3g = %.3g .\n",a,b,a,b,(double)(a-b)/(a*b));
printf("\n");
printf("Enter a\&b:\n");
}
printf("done!");
return 0;
}
