实参与形参三种值传递的比较

#include<iostream>
using namespace std;
int func_chuanzhi(int x)
{
	x = x*10;
	return x;
}
int func_zhizhen(int *x)
{
	*x = *x * 10;
	return *x;
}
int func_yinyong(int &x)
{
	x = x * 10;
	return x;
}
int main()
{
	int a = 9;
	cout<<"值传递"<<endl;
	cout<<func_chuanzhi(a)<<endl;
	cout<<a<<endl;
	cout<<"指针传递"<<endl;
	cout<<func_zhizhen(&a)<<endl;
	cout<<a<<endl;

	a =9;
	cout<<"引用传递"<<endl;
	cout<<func_yinyong(a)<<endl;
	cout<<a<<endl;
	return 0;
}