Write a preprocessor command that calculates the square of an integer.

Difficulty level
This exercise is mostly suitable for students 
#include <stdio.h>
#define SQUARE(x) (x)*(x)

int main()
{
     printf("Value = %d \n",SQUARE(2));
     printf("Value = %d \n",SQUARE(1+2*5-2%5));

     return 0;
}
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