技術標籤：c語言

程式碼

// An highlighted block
#include <stdio.h>
#define swap1(x,y) t = x; x = y; y = t;
#define swap2(x,y) t = x,x = y,y = t;
#define swap3(x,y) t = x; x = y; y = t
#define swap4(x,y) t = x,x = y,y = t
int main()
{
	int x = 1;
	int y = 2;
	int t = 0;
	t = x,x = y,y = t;
	printf("x = %d,y = %d,t = %d\n"
 
, x,y,t);
	swap1(x,y)
	printf("x = %d,y = %d,t = %d\n", x,y,t);
	swap2(x,y)
	printf("x = %d,y = %d,t = %d\n", x,y,t);
	swap3(x,y);
	printf("x = %d,y = %d,t = %d\n", x,y,t);
	swap4(x,y);
	printf("x = %d,y = %d,t = %d\n", x,y,t);
	return 0;
}

執行結果

結論

如果巨集定義最後自己有分號，呼叫時可以不加分號

// An highlighted block
#define swap1(x,y) t = x; x = y; y = t;

// An highlighted block
swap1(x,y)   //不加分號正常執行

一行語句可以執行多個賦值語句，用逗號隔開即可

// An highlighted block
t = x,x = y,y = t;