In this blog post, we learn how to write a C program to decimal to binary without using arithmetic operators?. We will write the C program to decimal to binary number without using arithmetic operators. Write a C program to input the decimal number and convert it to a binary number without using arithmetic operators. How to convert decimal to binary number in C programming without using arithmetic operators. Logic to convert decimal to binary number in C without using arithmetic operators.

Example,

Decimal Input: 5
Binary Output: 101


Decimal Input: 9
Binary Output: 1001

#include <stdio.h>


#define CHAR_BITS  8  // size of character
#define INT_BITS  (sizeof(int) * CHAR_BITS)

int main()
{
    int num, index, i;
    int bin[INT_BITS] = {0};

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

    //Array Index for binary number
    index = (INT_BITS - 1);

    while(index >= 0)
    {
        // to get the last binary digit of the number 'num'
        // and accumulate it at the beginning of 'bin'
        bin[index] = (num & 1);

        //Decrement index
        index--;

        //Right Shift num by 1
        num >>= 1;
    }

    //Display converted binary on the console screen
    printf("Converted binary is: ");
    for(i=0; i<INT_BITS; i++)
    {
        printf("%d", bin[i]);
    }

    return 0;
}

Output:

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