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C > Conversions Code Examples

Program to Convert a Decimal Number to Binary & Count the Number of 1s

Program to Convert a Decimal Number to Binary & Count the Number of 1s

 This C Program converts a decimal number into binary & count the number of 1s. The program uses module operation and multiplication with base 2 operation for conversion. It also uses modulo operation to check for 1's and accordingly increments the count of 1s.

/*
- C program to accept a decimal number and convert it to binary
- and count the number of 1's in the binary number
*/

    #include <stdio.h>
     

    void main()

    {

        long num, decimal_num, remainder, base = 1, binary = 0, number-of-1s = 0;

     

        printf("Enter a decimal integer \n");

        scanf("%ld", &num);

        decimal_num = num;

        while (num > 0)

        {

            remainder = num % 2;

            /*  To count no.of 1s */

            if (remainder == 1)

            {

                number-of-1s++;

            }

            binary = binary + remainder * base;

            num = num / 2;

            base = base * 10;

        }

        printf("Input number is = %d\n", decimal_num);

        printf("Its binary equivalent is = %ld\n", binary);

        printf("No.of 1's in the binary number is = %d\n", number-of-1s);

    }

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