In this blog post, we learn how to write a C program to decimal to binary number using recursion?. We will write the C program to decimal to binary number using recursion. Write a C program to input the decimal number and convert it to a binary number using recursion. How to convert decimal to binary number in C programming using recursion. Logic to convert decimal to binary number in C using recursion.

Example,

Input: 5
Output: 101


Input: 9
Output: 1001

C program to decimal to binary number using recursion:

The below program ask the user to enter the decimal number. After getting the value from the user it will convert the decimal number in a binary number.

#include <stdio.h>

// Recursive function to convert n
// to its binary equivalent
int decimalToBinary(int n)
{
    if (n == 0)
    {
        return 0;
    }
    else
    {
        return (n % 2 + 10 *
                decimalToBinary(n / 2));
    }
}

int main()
{
    //num for decimal number
    int num;

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

    //Called function
    printf ("%d",decimalToBinary(num));

    return 0;
}

Output:

Enter decimal number: 34
100010