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func_reload.cpp
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99 lines (60 loc) · 1.33 KB
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#include <iostream>
using namespace std;
//函数重载需要函数都在同一个作用域下
//void func()
//{
// cout << "func 的调用！" << endl;
//}
//void func(int a)
//{
// cout << "func (int a) 的调用！" << endl;
//}
//void func(double a)
//{
// cout << "func (double a)的调用！" << endl;
//}
//void func(int a ,double b)
//{
// cout << "func (int a ,double b) 的调用！" << endl;
//}
//void func(double a ,int b)
//{
// cout << "func (double a ,int b)的调用！" << endl;
//}
//函数返回值不可以作为函数重载条件
//int func(double a, int b)
//{
// cout << "func (double a ,int b)的调用！" << endl;
//}
//函数重载注意事项
//1、引用作为重载条件
void func(int &a)
{
cout << "func (int &a) 调用 " << endl;
}
void func(const int &a)
{
cout << "func (const int &a) 调用 " << endl;
}
//2、函数重载碰到函数默认参数
void func2(int a, int b = 10)
{
cout << "func2(int a, int b = 10) 调用" << endl;
}
void func2(int a)
{
cout << "func2(int a) 调用" << endl;
}
int main()
{
// func();
// func(10);
// func(3.14);
// func(10,3.14);
// func(3.14,10);
int a = 10;
func(a); //调用无const
func(10);//调用有const
// func2(10); //碰到默认参数产生歧义，需要避免
return 0;
}