Convert Hexadecimal to Octal.cpp

#include<iostream>

#include<math.h>

using namespace std;

int main()

{

    int decimalNum=0, octalNum[30], rem, i=0, len=0;

    char hexDecNum[10];

    cout<<"Enter the Hexadecimal Number: ";

    cin>>hexDecNum;

    while(hexDecNum[i]!='\0')

    {

        len++;

        i++;

    }

    len--;

    i=0;

    while(len>=0)

    {

        rem = hexDecNum[len];

        if(rem>=48 && rem<=57)

            rem = rem-48;

        else if(rem>=65 && rem<=70)

            rem = rem-55;

        else if(rem>=97 && rem<=102)

            rem = rem-87;

        else

        {

            cout<<"\nInvalid Hex Digit!";

            cout<<endl;

            return 0;

        }

        decimalNum = decimalNum + (rem*pow(16, i));

        len--;

        i++;

    }

    i=0;

    while(decimalNum != 0)

    {

        octalNum[i] = decimalNum%8;

        i++;

        decimalNum = decimalNum/8;

    }

    cout<<"\nEquivalent Octal Value: ";

    for(i=(i-1); i>=0; i--)

        cout<<octalNum[i];

    cout<<endl;

    return 0;

}