大整数比较

#include <iostream>
#include<algorithm>
#include<string>
#include<cstring>
#include<cmath>
#include<iomanip>
using namespace std;
int f(char* a, char* b)
{
    
    
	int l_a = strlen(a), l_b = strlen(b);
	if (a[0] == '-' && b[0] != '-')//a<0 ,b>0
	{
    
    
		return -1;
	}
	else if (a[0] == '-' && b[0] == '-')//a<0 ,b<0
	{
    
    
		if (l_a == l_b)
		{
    
    
			if (strcmp(a, b) == 1)return -1;
			else if (strcmp(a, b) == 0)return 0;
			else return 1;
		}
		else if (l_a < l_b)return 1;
		else return -1;
	}
	else if (a[0] != '-' && b[0] != '-')//a>0,b>0
	{
    
    
		if (l_a == l_b)
		{
    
    
			if (strcmp(a, b) == 1)return 1;
			else if (strcmp(a, b) == 0)return 0;
			else return -1;
		}
		else if (l_a < l_b)return -1;
		else return 1;
	}
	else if (a[0] != '-' && b[0] == '-')//a>0,b<0
	{
    
    
		return 1;
	}
}
int main()
{
    
    
	int t;
	cin >> t;
	while (t--)
	{
    
    
		char a[100], b[100];
		cin >> a >> b;
		if (f(a, b) == 1)cout << ">" << endl;
		else if (f(a, b) == 0)cout << "=" << endl;
		else if (f(a, b) == -1)cout << "<" << endl;
	}
}