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C++ Program to Convert Decimal to Binary

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In this tutorial, we will learn to convert a decimal number into binary in C++. Before that, you must have knowledge of the following topics in C++.

Binary number

The binary numbers are based on 0 and 1, so it is a base 2 number. They are the combination of 0 and 1. For example, 1001, 110101, etc.

Decimal Number

These are the numbers with a base 10, which ranges from 0 to 9. These numbers are formed with the combination of 0 to 9 digits such as 24, 345, etc.

Here is the chart where for the equivalent value of decimal and binary numbers.

Decimal to binary

Now let us go through a program for the conversion of decimal to binary in C++.

C++ Program to Convert Decimal to Binary

The program asks the user to enter a decimal number and using a for loop it calculates the binary value. Lastly, display the equivalent binary value. 

#include <iostream>
using namespace std;

int main()
{
   int bin[10], deci, i;

   cout << "Enter the decimal number: ";
   cin >> deci;

   for (i = 0; deci > 0; i++)
   {
      bin[i] = deci % 2;
      deci = deci / 2;
   }

   //Display the converted decimal number
   cout << "Binary value: ";
   for (i = i - 1; i >= 0; i--)
      cout << bin[i];

   return 0;
}

Output:

Enter the decimal number: 10
Binary value: 1010

Also, check out a similar program:

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