How do you write a computer program to convert a decimal number into binary, octal, and hexadecimal?

#include <iostream>

using namespace std;

void hexadecimal(int dec)

{    

   char hexa[100];// character array to store hexadecimal number.

   int i = 0;

   while(dec!=0)

   {  

       int digit  = 0;

       digit = dec % 16;// storing remainder.

       if(digit < 10)//condition

       {

           hexa[i] = digit + 48;//storing digit according to ascii values.

           i++;

       }

       else

       {

           hexa[i] = digit + 55; //storing respective character according to ascii values..

           i++;

       }

       dec = dec/16;

   }

     cout<<"The corresponding Hexadecimal number is :- ";

   for(int j=i-1; j>=0; j--)// printing in reverse order .

       cout << hexa[j];

       cout<<endl;

}

void Binary(int dec)

{

   int bin[32];// integer array to store binary values.

   int i = 0;

   while (dec > 0) {

       bin[i] = dec % 2;// storing remainder

       dec = dec / 2;

       i++;

   }

 cout<<"The corresponding Binary number is :- ";

   for (int j = i - 1; j >= 0; j--) // printing in reverse order

       cout << bin[j];

       cout<<endl;

}

void Octal(int dec)

{

   int oct[100];// integer array to store octal values.

   int i = 0;

   while (dec != 0) {

       oct[i] = dec % 8;// storing remainder

       dec = dec / 8;

       i++;

   }

 cout<<"The corresponding Octal number is :- ";

   for (int j = i - 1; j >= 0; j--) // printing in reverse order

       cout << oct[j];

       cout<<endl;

}

int main() {

   int d,bin,oct,hex;

   cout<<"Enter decimal number"<<endl;

   cin>>d;//taking input.

   Binary(d);

   Octal(d);

   hexadecimal(d);

   return 0;

}

OUTPUT:-

Enter decimal number

10

The corresponding Binary number is :- 1010

The corresponding Octal number is :- 12

The corresponding Hexadecimal number is :- A

Enter decimal number

256

The corresponding Binary number is :- 100000000

The corresponding Octal number is :- 400

The corresponding Hexadecimal number is :- 100

Explanation:

I have built 3 function of type void Hexadecimal,Binary,Octal all the functions take decimal integer as argument.They print their respective number after conversion.

So main approach is that :-

1.Take an array to store the digit on dividing.

2.Find the remainder on dividing it by corresponding number (for ex:- if binary divide by 2).

3.Store each remainder in the array.

4.Divide the number until it becomes 0.

5.Print the array in reverse.

that would be my answer.