MTQ1 yeo

//yeo punya
//midtermq1
#include <iostream>
#include <string>
using namespace std;

string AddBin(string num1, string num2);
string TwosComp(string bin);
string SubBin(string a, string b);

int main()
{
    string a, b,result;
    cout << "Enter 2 number: ";
    cin >> a;
    cin >> b;
    result = AddBin(a, b);
    cout << result << endl;
    result = TwosComp(a);
    cout << result << endl;
    result = SubBin(a, b);
    cout << result << endl;
    return 0;
}

string AddBin(string num1, string num2){
    string temp = "";
    int carry = 0;
    for (int i = num1.length() - 1; i >= 0; i--){
        if (num1.at(i) == '1'&& num2.at(i) == '1' && carry == 0){
            temp = '0' + temp;
            carry = 1;
            continue;
        }
        if (num1.at(i) == '0'&& num2.at(i) == '0' && carry == 0){
            temp = '0' + temp;
            carry = 0;
            continue;
        }
        if (num1.at(i) == '1'&& num2.at(i) == '1' && carry == 1){
            temp = '1' + temp;
            carry = 1;
            continue;
        }
        if (num1.at(i) == '0'&& num2.at(i) == '0' && carry == 1){
            temp = '1' + temp;
            carry = 0;
            continue;
        }
        if (num1.at(i) == '1'&& num2.at(i) == '0' && carry == 0){
            temp = '1' + temp;
            carry = 0;
            continue;
        }
        if (num1.at(i) == '0'&& num2.at(i) == '1' && carry == 0){
            temp = '1' + temp;
            carry = 0;
            continue;
        }
        if (num1.at(i) == '1'&& num2.at(i) == '0' && carry == 1){
            temp = '0' + temp;
            carry = 1;
            continue;
        }
        if (num1.at(i) == '0'&& num2.at(i) == '1' && carry == 1){
            temp = '0' + temp;
            carry = 1;
            continue;
        }
    }
    if (carry == 1)
        temp = '1' + temp;
    return temp;
}
string TwosComp(string bin){
    int len = bin.length();
    string temp = 0, one;
    for (int i = 0; i < len; i++){
        if (bin[i] == '1')
            temp = temp + '0';
        else
            temp = temp + "1";
    }
    for (int j = 0; j < len - 1; j++)
        one[j] = '0';
    one += "1";
    temp = AddBin(temp, one);
    return temp;
}
string SubBin(string a, string b){
    string mb = TwosComp(b);
    string temp = AddBin(a, mb);
    return temp;
}