C++ Program to Convert Decimal to Octal

C++ Decimals to Binary C++ Decimal to Octal C++ Decimal to Hexadecimal C++ Binary To Decimal C++ Hexadecimal to Decimal C++ hex (Hexadecimal) string to signed Integer C++ an Integer into a String C++ a String into an Integer Data C++ a string into the ASCII Format C++ Character into Integer C++ Character into a String C++ String to Date C++ double to string C++ Character To Ascii C++ Character Into Integer C++ string to float C++ string to Double C++ Numbers Into Their Words Equivalent C++ Decimal int to Hexadecimal C++ HEX to ASCII String

#include <iostream>
#include<cmath>
using namespace std;
void DecToOct(int decnum)
{
                int digits=1;
                int howbig=1;
                // check to see how many digits
                while(1)
    {
                if((8*howbig)>decnum)
        {
                break;
        }
                else
        {
            howbig*=8;
            digits++;
        }
    }
                // using binary to get octal
                for(int i=digits; i>0; i--)
        cout<<((decnum>>((i-1)*3))&7);
}
void DecToQuat(int decnum)
{
                int digits=1;
                int howbig=1;
                // check to see how many digits
                while(1)
    {
                if((4*howbig)>decnum)
        {
                break;
        }
                else
        {
            howbig*=4;
            digits++;
        }
    }
                // using binary to get quat
                for(int i=digits; i>0; i--)
        cout<<((decnum>>((i-1)*2))&3);
}
int main()
{
                int decimalnum;
    cout<<"Enter the decimal to be converted:";
    cin>>decimalnum;
    DecToOct(decimalnum);
    cout<<endl;
    DecToQuat(decimalnum);
                return 0;
}
/*
OUTPUT:
Enter the decimal to be converted:512
1000
20000
*/