12 lines · 183 B · C
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#include <stdio.h>	// printf() #define CAT2(a,b) a##b#define CAT(a,b) CAT2(a,b)#define AB(x) CAT(x,y) int main(void){  int xy = 42;  printf("%d\n", CAT(A,B)(x));  return 0;}