Binary to decimal conversion

#1

int n,s=0;
cin>>n;
while(n>0)
{
s+=(n%10);
s=s<<1;
n=n/10;
}
cout<<s;
/* Above code giving wrong output for numbers which ends with 0 ,how do i correct it?*/

#2

@aniket07
You would require the help of a third variable to solve this problem which will act as a multiplier factor for s.

int n, s = 0, b = 1; 
 cin>>n;
        while (n > 0) {
            s += (n % 10) * b;
            b = b << 1;
            n = n / 10;
        } 
 cout<<s;
#3

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