Challenge 0 – Why doesn’t the operation give the correct value? in C++

Difficulty x10

x5

This Challenge was proposed for the now defunct C/C++ programming list CWORLD in 1999.
The source code of the challenge has been updated to modern C++, but maintaining the essence of the challenge, which its original author wanted to transmit.

This is very easy. Why doesn’t the operation give the correct value? Can you fix the code?

NOTE: I learned this from a C/C++ book, which warned about this error.

Source Code

#include <iostream>


#define ADD(x,y)    x + y
#define SUB(x,y)    x - y
#define MUL(x,y)    x * y
#define DIV(x,y)    x / y


int main(void)
{
	double x, y;
	x = 5;
	y = 2;
	/* (5/2+5*2)*2 = 25 */
	std::cout << "(x/y+x*y)*2 = " << ADD(DIV(x, y), MUL(x, y)) * 2 << std::endl;
	return 0;
}

AND FINALLY I CAN ONLY SAY …. BEST OF LUCK AND MAY THE BEST CODE WIN….

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Solución