#include <stdio.h> #define P(A,B) A ## B ; bob#define Q(A,B) A ## B+ int main(void){    int bob, jim = 21;    bob = P(jim,) *= 2;    printf("jim: %d, bob: %d\n", jim, bob);    jim = 60 Q(+,)3;    printf("jim: %d\n", jim);    return 0;}