编辑代码

#include<iostream>
using namespace std;
int farm(int a, int b)
{
    if ( a <= 0 || b <= 0)
    {
        cout << "请检查数据输入是否正确";
        return -1;
    }
    if (b < a)
    {
        int t = a;
        a = b;
        b= t;
    }
    if (a % b == 0)
        return a;
    while (a% b != 0)
    {
        int c = b;
        b= a% b;
        a = c;
    }
    return b;
}
int main()
{
    int a, b;
    cin >> a;
    cin >> b;
    cout << "土地的边长为" << farm(a, b) << endl;
    return 0;
}