字符串升序

#include<bits/stdc++.h>
using namespace std;

int main()
{
    char a[55] = {},b[55] = {} ;
    while(cin >> a && cin >> b)
    {
        ///方式一
        int len = max(strlen(a), strlen(b));
        bool flag = 1;
        for(int i = 0; i < len; i++)
        {
            if(a[i] < b[i])
            {
                cout << a << '\n' << b << '\n';
                flag = 0;
                break;
            }
            if(b[i] < a[i])
            {
                cout << b << '\n' << a << '\n';
                flag = 0;
                break;
            }
            if(a[i] == b[i])
                continue;
        }
        if(flag)
            cout << "a == b" << '\n';
        cout << '\n';
        ///方式二
        if(strcmp(a, b) < 0)
            cout << a << '\n' << b << '\n';
        if(strcmp(a, b) > 0)
            cout << b << '\n' << a << '\n';
        if(strcmp(a, b) == 0)
            cout << "a == b" << '\n';
        cout << '\n';
        ///方式三（不可取）
        if(a < b)
            cout << a << '\n' << b << '\n';
        if(a > b)
            cout << b << '\n' << a << '\n';
        if(a == b)
            cout << "a == b" << '\n';
    }
    return 0;
}