C語言宏中#、##運算符的使用

#include <stdio.h> #define P1(a) printf("%s^2 = %d\r\n", #a, (a)*(a)) #define P2(x) printf(#x"^2 = %d\r\n", (x)*(x)) #define F1(i,a) fun##i(a) #define F2(fun,i

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