#include <stdio.h>
int main( void )
{
double n, m;
double res;
printf("Enter a pair of numbers: ");
while (scanf("%lf %lf", &n, &m) == 2)
{
res = (n - m) / (n * m);
printf("(%.3g - %.3g)/(%.3g*%.3g) = %.5g/n", n, m, n, m, res);
printf("Enter next pair (non-numeric to quit): ");
}
return 0;
}
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