1.7

<img src="https://img-blog.youkuaiyun.com/20150407194531120?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQveHVlaG9uZ2hhbw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" /><pre class="cpp" name="code">#include<iostream>
using namespace std;
int max(int x,int y,int z)
{
	if(x>y) y=x;
	if(y>z) z=y;
	return z;
}
int main()
{
	int a=20,b=2,c=565;
	max(a,b,c);
    cout<<max(a,b,c); 
}