（字符串）大小写字母转换

题目大意

大小写等价，比较两个字符串的大小

代码

#include <iostream>
#include <string>
using namespace std;

int main()
{
    string s1,s2;
    cin>>s1>>s2;
    int len = s1.size();
    for(int i=0;i<len;i++)
    {
        if(s1[i]>='a' && s1[i]<='z')
            s1[i] = s1[i] +'A' -'a';
        if(s2[i]>='a' && s2[i]<='z')
            s2[i] = s2[i] +'A' -'a';
        if(s1[i] > s2[i])
        {
            cout<<"1";
            return 0;
        }
        if(s1[i] < s2[i])
        {
            cout<<"-1";
            return 0;
        }
    }
    cout<<'0';
//    cout<<s1<<' '<<s2
    return 0;
}