BinaryToDecimal&&<-C++

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

string decToBin(int dec) {
    int i;
    string txt="";
    string bin="";
    while(dec!=0){
        if(dec%2==0){
            txt+="0";
        } else{
            txt+="1";
        }
        dec/=2;
    }
    for(i = txt.size()-1; i >= 0; i--){
        bin+=txt.at(i);
    }
    return bin;
}

int binToDec(int bin) {
    int dec = 0;
    int power = 0;
    while (bin != 0) {
        dec += (bin % 10) * pow(2, power);
        power++;
        bin /= 10;
    }
    return dec;
}

int main() {
    while (true) {
        cout<< endl<< "1: BIN -> DEC";
        cout<< endl<< "2: DEC -> BIN";
        cout<< endl<< "3: EXIT"<< endl;
        cout<< endl<< "What is your choice: ";
        int choice;
        cin>> choice;
        switch (choice) {
        case 1:
            cout<< endl<< "Enter binary number: ";
            int bin;
            cin>> bin;
            cout<< endl<< "Decimal number: "<< binToDec(bin)<< endl;
            break;
        case 2:
            cout<< endl<< "Enter decimal number: ";
            int dec;
            cin>> dec;
            cout<< endl<< "Binary number:"<< decToBin(dec)<< endl;
            break;
        case 3:
            break;
        default:
            cout<< endl<< "Wrong choice! Try again!" << endl;
        }
        if (choice == 3) {
            break;
        }
    }
    return 0;
}