ДЗ 11-2-3 2=>10

/*
Написать функцию для перевода числа,
записанного в двоичном виде, в десятичное представление.
*/

#include <iostream>

using namespace std;

void convert(int binaryNumber);
bool validation(int binaryNumber);

int main()
{
    int userBinaryNumber;

    cout << "This program converts the binary number to decimal." << endl <<
        "Enter the number in the binary system: ";
    cin >> userBinaryNumber;
    convert(userBinaryNumber);
}

void convert(int binaryNumber)
{
    if (!validation(binaryNumber))
    {
        return;
    };

    int multiplier = 1;
    int decimalNumber = 0;
    int numberDegree = 0;

    cout << "Number " << binaryNumber << " in decimal = ";

    do
    {
        decimalNumber += binaryNumber % 10 * multiplier;
        multiplier *= 2;
        binaryNumber /= 10;
    } while (binaryNumber > 0);

    cout << decimalNumber << endl;
}

bool validation(int binaryNumber)
{
    do
    {
        if ((binaryNumber % 10) == 1 || (binaryNumber % 10) == 0)
        {
            binaryNumber /= 10;
        }
        else
        {
            cout << "Incorrect value" << endl;
            return false;
        }
    } while (binaryNumber > 0);
    return true;
}