函数间的参数传递

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函数间的参数传递

值调用：

//交换两个变量的值（不成功）#include<iostream>using namespace std;void myswap(int x, int y){    int tmp = x;    x = y;    y = tmp;}int main(){    int a = 2, b = 3;    cout<<"Before exchange : a = "<<a<<", b = "<<b<<endl;    myswap(a, b);    cout<<"After exchange  : a = "<<a<<", b = "<<b<<endl;    return 0;}

引用调用：

//交换两个变量的值(成功）#include<iostream>using namespace std;void myswap(int &x, int &y){    int tmp = x;    x = y;    y = tmp;}int main(){    int a = 2, b = 3;    cout<<"Before exchange : a = "<<a<<",b = "<<b<<endl;    myswap(a, b);    cout<<"After exchange  : a = "<<a<<",b = "<<b<<endl;    return 0;}

地址调用：

//交换两个变量的值(成功）#include<iostream>using namespace std;void myswap(int *x, int *y){    int temp = *x;    *x = *y;    *y = temp;}int main(){    int a = 2, b = 3;    cout<<"Before exchange : a = "<<a<<",b = "<<b<<endl;    myswap(&a, &b);    cout<<"After exchange  : a = "<<a<<",b = "<<b<<endl;    return 0;}

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