How to convert decimal to binary in C

This C program converts a decimal number into its binary equivalent.

Before writing the code, you must learn about binary and decimal number systems.

Program 1: C program to convert decimal to binary

#include<stdio.h>
int main()
{
    long num,rem,base=1,binary=0;
    printf("Enter a number: ");
    scanf("%ld",&num);
    while(num>0)
    {
        rem=num%2;
        binary=binary+rem*base;
        num=num/2;
        base*=10;
    }
    printf("\nBinary equivalent of the entered number is: %ld \n",binary);
    return 0;
}

Sample Output:

Enter a number: 9

Binary equivalent of the entered number is: 1001

Program 2: C Program to convert decimal to binary using for loop

#include<stdio.h>
int main()
{
    long num,rem,base=1,binary=0;
    printf("Enter a number(base 10): ");
    scanf("%ld",&num);
    //decimal to binary conversion using for loop
    for(;num>0;num=num/2)
    {
        rem=num%2;
        binary=binary+rem*base;
        base*=10;
    }
    printf("\nBinary equivalent of the entered number is: %ld \n",binary);
    return 0;
}

Sample output:

Enter a number(base 10): 15

Binary equivalent of the entered number is: 1111 

Share your code to convert decimal to binary in the comments.