#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

// WRONG (naïve)
#define  FIVE_PLUS(n)  5 + n

int main(int argc, char* argv[]) {

    printf("%d\n",  FIVE_PLUS(100));  // ⇒ 105
    // Preprocessor will replace  FIVE_PLUS(100)  with  5 + 100.
    
    // This will NOT work as you expect.
    printf("%d\n",  1000 * FIVE_PLUS(100));
    // Preprocessor will replace  FIVE_PLUS(100)  with  5 + 100.
    // Statement will become:
    //   printf("%d\n",  1000 * 5 + 100);
    // Expect:  105000  but that's not what we will get.
    // Actual:  5100
    
    return EXIT_SUCCESS;
}
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