# C Program to Convert Decimal to Binary2 min read

In this tutorial, we will write a C program to convert decimal to binary. 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 of 10, which ranges from 0 to 9. These numbers are formed by 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.

Example:

`Input: 5 Output: 101Input: 15Output: 1111`

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

## C Program to Convert Decimal to Binary using While loop

Output:

`Enter a decimal number: 13Equivalent Binary Number: 1101`

## C Program to Convert Decimal to Binary without using Array

Source code: Decimal to Binary without using Array in C.

After the successful execution of the above program, it will produce the same output as the above program.

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