C Programms: C 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.

Here is source code of the C program to convert a decimal number to binary & count the number of 1s. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * 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, no_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)
```
```
        {
```
```
            no_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", no_of_1s);

```
}
```

$ cc pgm46.c
$ a.out
Enter a decimal integer
134
Input number is = 134
Its binary equivalent is = 10000110
No.of 1's in the binary number is = 3

C Programms

Monday, August 4, 2014

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

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