How to convert decimal number into its octal and hexadecimal equivalent in C++

Program to read one number from the user and display its octal and hexadecimal equivalent.

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#include<iostream>

#include<conio.h>

using namespace std;

int octal_conversion(int number);

void hexadecimal_conversion(int number);

int main()

{

       int number = 0, octal_number = 0;

       cout << "\n\t\t__ Octal and Hexadecimal Conversion __";

       cout << "\n\n\n  Enter the Decimal Number - ";

       cin >> number;

       octal_number = octal_conversion(number);

       cout << "\n\n\t __ Octal Conversion of " << number << " is " << octal_number << " __";

       hexadecimal_conversion(number);

       getch();

       return 0;

}

int octal_conversion(int number)

{

       int remainder = 0, octal_number = 0, counter = 1;

       while(number != 0)

       {

              remainder = number % 8;

              number = number / 8;

              octal_number = octal_number  + remainder * counter;

              counter = counter * 10;

       }

       return octal_number;

}

void hexadecimal_conversion(int number)

{

       int original_number = 0, remainder = 0, counter = 0, i  = 0, value = 0;

       char hexadecimal_number[10];

      

       original_number = number;

       while(number > 0)

       {

              remainder = number % 16;

             

              number = number / 16;

              value = 0;

              if (remainder >= 0 && remainder <= 9)

              {

                     value = 48;

                     for ( i = 1; i <= remainder; i ++)

                     {

                           value = value + 1;

                     }            

              }

              else if (remainder >= 10 && remainder <= 15)

              {

                     value = 65;

                     for ( i = 11; i <= remainder; i ++)

                     {

                           value = value + 1;

                     }

              }

             

              hexadecimal_number[counter] = (char)value;

             

              counter++;

       }

       cout << "\n\n\t __ Hexadecimal Conversion of " << original_number << " is ";

             

             

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

       {

              cout << hexadecimal_number[i];

       }

             

       cout << " __";

}

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