C / C++ / MFC

#include <iostream>
#include <cmath>
#include <sstream>
#include <cstring>
#include <string>
using namespace std;

int main()
{
	int cases, binary[100];
	cin>>cases;

	int *result = new int[cases];
	int j;
	for(j=0; j<cases; j++){
		
        stringstream ss[3];
		for(int k=0; k<2; k++)
		{
			int n;
			cin>>n;
			int temp=n, i=0, len;
			while(temp > 0){
				binary[i] = temp%2;
				temp /= 2;
				i++;
			}
			len = i;

			string str ;
			for(int i=0; i<len; ++i){
				stringstream ss;
				ss << binary[(len-1)-i];
				str += ss.str() ;
			}
			ss[k] << str;
		}

    	string str1 = ss[0].str(), str2 = ss[1].str();
	    int len = (str1.length() > str2.length()) ? str1.length() : str2.length() ;

    	if(str1.length() < (unsigned)len){
       	 int diff = len - str1.length();
       	 for(int i=0; i<diff; ++i){
        	    str1 += '0';
    	    }
   	 	}
    	else if(str2.length() < (unsigned)len){
      	  int diff = len - str2.length();
       	 for(int i=0; i<diff; ++i){
        	    str2 += '0';
    	    }
   	 	}

   	 	string str3 = str1;
  	  	for(int i=0; i<len; ++i){
   	    	 if(str1[i]==str2[i]){
    	        str3[i]='0';
    	    }else   str3[i]='1';
    	}
		int length = str3.length(), val=0;
 	   	for(int i=0, m=length-1; i<length, m>=0; ++i,--m){
       		if(str3[i] == '1'){
	        	    val += pow(2, m);
    	   	 }
   	 	}
   	 	result[j] = val;
	}

	for(int i=0; i<cases; i++){
		cout<<result[i]<<endl;
	}
	return 0;
}