Three ways to pass parameters to a function

#include void swap1(int x, int y)//定义中的x,y变量是swap函数的两个形参 { int tmp; tmp = x; x = y; y = tmp; printf("x=%d,y=%d\n", x, y); } int main() { int a = 2; int b = 3; swap1(a, b);//a,b变量为swap函数的实际参数 printf("a=%d,b=%d", a, b); return 0; }

void swap2(int *px, int *py) { int tmp; tmp = *px; *px = *py; *py = tmp; printf("px=%d,py=%d\n", *px, *py); } int main() { int a = 2; int b = 3; swap2(&a, &b);/*调用了swap函数，同样也有隐含动作px=&a;py=&b;*/ printf("a=%d,b=%d", a, b); return 0; }

#include void swap3(int &x,int &y) { int tmp = x; x = y; y = tmp; printf("x=%d,y=%d\n", x, y); } int main() { int a = 2; int b = 3; swap3(a, b);//调用方式与传值一样 printf("a=%d,b=%d", a, b); system("pause"); return 0; }