C++ 代码

#include <iostream>

using namespace std;

int main()
{
    string a,b;
    getline(cin, a);
    getline(cin, b);

    for(auto &c : a) 
        c = tolower(c);
    for(auto &c : b) 
        c = tolower(c);
    int m = a.compare(b); //若a按顺序先于b，则返回负值，即后者大
    if(m < 0)
        cout << '<' << endl;
    else if(m > 0)
        cout << '>' << endl;
    else
        cout << '=' << endl;
    return 0;
}