第7题

#include<iostream>using namespace std;int swap(int a=1,int b=2,int c=3){if(a>b)  a=a;else     a=b;if(a>c)  a=a;else     a=c;return a;}int main(){int a,b,c;cout <<"输入三个正整数"<<endl;cin>>a>>b>>c;swap(a,b,c);cout <<"最大数为:"<<swap(a,b,c)<<endl; return 0;}