Program to convert binary to decimal using while loop in C-language

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#include<stdio.h>
#include<math.h>
int main()
{
    int a,b,c=0,f=0;
    printf("Enter the binary number\n");
    scanf("%d",&a);
    printf("Decimal of %d is\n",a);
    while(a!=0)
    {
        b=a%10;
        a=a/10;
        f=f+pow(2,c)*b;
        c++;
    }
    printf("%d",f);
}

OUTPUT
Enter the binary number
1011
Decimal of 1011 is
11

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