C++缺省参数

1.定义

2.分类

1.全缺省参数

//定义函数Func
void Func(int a = 10,int b = 20,int c = 30)
{
    cout <<<< "a = " << a << endl;
	cout << "b = " << b << endl;
	cout << "c = " << c << endl;
	cout << endl;
}
int main()
{
	Func();
	Func(1);
	Func(1, 2);
	Func(1, 2, 3);
	return 0;
}

运行结果：

2.半缺省参数

//定义函数Func
void Func(int a,int b = 20,int c = 30)//参数的值只能从右向左给出
{
    cout <<<< "a = " << a << endl;
	cout << "b = " << b << endl;
	cout << "c = " << c << endl;
	cout << endl;
}