C 将二进制数转换为十进制数的程序不起作用

Question

Following is a C program which i wrote for converting binary number into decimal, but it always gives output '0'. Can someone point out the mistake?

#include<stdio.h>
main()
{
int a=1/2,p=0,rem,n;
printf("Enter a binary number:");
scanf("%d",&n);
while(n!=0)
{
    a=a*2;
    rem=n%10;
    p=p+rem*a;
    n=n/10;
}
printf("Its decimal equivalent is %d",p);
}

Answer 1

when you divide integer numbers in c its round the solution. so if you want to calc a/b as float you need casting like this a/(float)b