C++ - Decimal to binary converting

Question

I wrote a \'simple\' (it took me 30 minutes) program that converts decimal number to binary. I am SURE that there\'s a lot simpler way so can you show me? Here\'s the code:<

Answer 1

DECIMAL TO BINARY NO ARRAYS USED *made by Oya:

I'm still a beginner, so this code will only use loops and variables xD...

Hope you like it. This can probably be made simpler than it is...

    #include 
    #include 
    #include 

    using namespace std;

    int main()
    {
        int i;
        int expoentes; //the sequence > pow(2,i) or 2^i
        int decimal; 
        int extra; //this will be used to add some 0s between the 1s
        int x = 1;

        cout << "\nThis program converts natural numbers into binary code\nPlease enter a Natural number:";
        cout << "\n\nWARNING: Only works until ~1.073 millions\n";
        cout << "     To exit, enter a negative number\n\n";

        while(decimal >= 0){
            cout << "\n----- // -----\n\n";
            cin >> decimal;
            cout << "\n";

            if(decimal == 0){
                cout << "0";
            }
            while(decimal >= 1){
                i = 0;
                expoentes = 1;
                while(decimal >= expoentes){
                    i++;
                    expoentes = pow(2,i);
                }
                x = 1;
                cout << "1";
                decimal -= pow(2,i-x);
                extra = pow(2,i-1-x);
                while(decimal < extra){
                    cout << "0";
                    x++;
                    extra = pow(2,i-1-x);
                }
            }
        }
        return 0;
    }