program to convert a binary number to a decimal number.

Program to convert a binary to decimal number.

#include <stdio.h>

int main()

{

    int n, sn, i = 1, dec = 0, rem;

    printf("Enter a binary number:\t");

    scanf("%d", &n);

    sn = n;

    while (n > 0) /* work when number is

greater than 0.*/

    {

        rem = n % 10; // reminder is 0 or 1 only

        if (rem == 1 || rem == 0) //binary number

        {

            dec = dec + rem * i;

            i *= 2; // power of 2's.

            n = n / 10;

        }

    }

    printf("Decimal Equivalent of %d is %d ", sn, dec);

    return 0;

}

Output :

Enter a binary number: 1101 Decimal Equivalent of 1101 is 13

for this we extract binary digits from right and add them after multiplying power of 2.