C++基础之函数重载

swap函数实现

#include <iostream>
 
using namespace std;
 
void fun(int* a,int* b){
    int t = *a;
    *a = *b;
    *b = t;
}
 
void fun(char* a,char* b){
    char t = *a;
    *a = *b;
    *b = t;
}
 
void fun(double &a,double &b){
    double t = a;
    a = b;
    b = t;
}
 
void fun(string &a,string &b){
    string t = a;
    a = b;
    b = t;
}
 
int main()
{
    //int
    int num1 = 3, num2 = 4;
    cout << "Before:" << "num1 = " << num1 << '\t' << "num2 = " << num2 << endl;
 
    fun(&num1,&num2);
    cout << "After:" << "num1 = " << num1 << '\t' << "num2 = " << num2 << endl;
    cout << endl;
 
    //cahr
    char ch1 = 'a', ch2 = 'b';
    cout << "Before:" << "ch1 = " << ch1 << '\t' << "ch2 = " << ch2 << endl;
 
    fun(&ch1,&ch2);
    cout << "After:" << "ch1 = " << ch1 << '\t' << "ch2 = " << ch2 << endl;
    cout << endl;
 
    //double
    double var1 = 5.20, var2 = 13.14;
    cout << "Before:" << "var1 = " << var1 << '\t' << "var2 = " << var2 << endl;
 
    fun(var1,var2);
    cout << "After:" << "var1 = " << var1 << '\t' << "var2 = " << var2 << endl;
    cout << endl;
 
    //string
    string str1 = "hello", str2 = "world";
    cout << "Before:" << "str1 = " << str1 << '\t' << "str2 = " << str2 << endl;
 
    fun(str1,str2);
    cout << "After:" << "str1 = " << str1 << '\t' << "str2 = " << str2 << endl;
    return 0;
}

运行效果：