C++ 函数重载

在同一个作用域内，可以声明几个功能类似的同名函数，但是这些同名函数的形式参数（参数个数，类型或者顺序）必须不同。

下面有实例：

重载函数：

Mysquare ( )

    

#include <iostream>

using namespace std ;

int Mysquare ( int i);

float Mysquare ( float f);

float Mysquare ( int i, int j);

int main ()

{

     int i,j;

     float f;

    cout << "请输入i j f" << endl;

    cin >> i >> j >> f;

     int a;

    a = Mysquare (i);

     float b;

    b = Mysquare (f);

     int c;

    c = Mysquare (i,j);

cout << a << "" << endl << b << "" << endl << c << endl;

     return 0 ;

}

int Mysquare ( int i)

{

     return i * i;

}

float Mysquare ( float f)               //重载函数1

{

     return f * f;

}

float Mysquare ( int i, int j)          //重载函数2

{

     float m;

    m = i * i + j * j;

     return m;

}

重载函数：

max（）

nclude < iostream >

using namespace std ;

int max ( int i1, int i2)

{

         int a;

        a = i1 + i2;

        cout << "this is two int paramenters a = " << a << endl;

         return 0 ;

}

int max ( int j1, int j2, int j3)

{

         int b;

        b = j1 + j2 + j3;

        cout << "this is three int  paramenters b = " << b << endl;

         return 0 ;

}

double max ( double m1, double m2)

{

         double c;

        c = m1 + m2;

        cout << "this is two  double   paramenters c = " << c << endl;

         return 0 ;

}

double max ( double n1, double n2, double n3)

{

         double d;

        d = n1 + n2 + n3;

        cout << "this is three double paramenters d = " << d << endl;

         return 0 ;

}

int main ()

{

         int a = 1 , b = 2 , c = 3 ;

         max (a, b);

         max (a, b, c);

         double d = 1.1 , e = 2.2 , f = 3.3 ;

         max (d, e);

         max (d, e, f);

         return 0 ;

}