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C Program to Convert Decimal to Binary

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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.

Decimal to binary

Example:

Input: 5
Output: 101

Input: 15
Output: 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

#include <stdio.h>
#include <conio.h>

int main()
{
  int deciNum, binaryNum[30], i = 0;

  printf("Enter a decimal number: ");
  scanf("%d", &deciNum);

  while (deciNum != 0)
  {
    binaryNum[i] = deciNum % 2;
    i++;
    deciNum = deciNum / 2;
  }

  printf("Equivalent Binary Value: ");
  for (i = (i - 1); i >= 0; i--)
    printf("%d", binaryNum[i]);

  getch();
  return 0;
}

Output:

Enter a decimal number: 13
Equivalent Binary Number: 1101

C Program to Convert Decimal to Binary without using Array

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

#include <stdio.h>
#include <conio.h>

int main()
{
  int deciNum, binaryNum = 0, mul = 1, rem;

  printf("Enter any decimal number: ");
  scanf("%d", &deciNum);

  while (deciNum > 0)
  {
    rem = deciNum % 2;
    binaryNum = binaryNum + (rem *mul);
    mul = mul * 10;
    deciNum = deciNum / 2;
  }

  printf("Equivalent Binary Value: %d", binaryNum);

  getch();
  return 0;
}

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

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