C Program to Convert the given Binary Number into Decimal

This C Program converts the given binary number into decimal. The program reads the binary number, does a modulo operation to get the remainder, multiples the total by base 2 and adds the modulo and repeats the steps.

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

1. /*

2.  * C program to convert the given binary number into decimal

3.  */

4. #include <stdio.h>

6. void main()

7. {

8.     int  num, binary_val, decimal_val = 0, base = 1, rem;

10.     printf("Enter a binary number(1s and 0s) \n");

11.     scanf("%d", &num); /* maximum five digits */

12.     binary_val = num;

13.     while (num > 0)

14.     {

15.         rem = num % 10;

16.         decimal_val = decimal_val + rem * base;

17.         num = num / 10 ;

18.         base = base * 2;

19.     }

20.     printf("The Binary number is = %d \n", binary_val);

21.     printf("Its decimal equivalent is = %d \n", decimal_val);

22. }

$ cc pgm38.c
$ a.out
Enter a binary number(1s and 0s)
10101001
The Binary number is = 10101001
Its decimal equivalent is = 169S