编辑代码

#include<iostream>
using namespace std;
int jS(int a,int b)//a为长，b为宽
{
if(a<b||a<=0||b<=0)
{
cout<<"数据不合法";
return -1;
}
if(a%b==0)
return b;
while(a%b!=0)
{
int change=b;
b=a%b;
a=change;
}
return b;
}
int main()
{
    int a;
    int b;
    cout<<"请输入长"<<endl;
    cin>>a;
    cout<<"请输入宽"<<endl;
    cin>>b;
    cout<<"方块的边长应该是"<<jS(a, b)<<endl;
    return 0;
}