Binary number to decimal number

Given a Binary Number, Print its decimal equivalent.

Input:

The first line of input contains an integer T denoting the number of test cases. The description of T test cases follows. Each test case contains a single Binary number. 

Output: 

Print each Decimal number in new line.

Constraints:

1< T <100
1<=Digits in Binary<=8

Example:
Input:
2
10001000
101100

Output:
136
44

Your Code

#include<iostream>

using namespace std;

#include<math.h>

int main()

{

int t;

cin>>t;

while(t--)

{

long int n;

int i=0, sum=0;

cin>>n;

while(n!=0)

{

int k;

k=n%10;

n=n/10;

sum=sum+k*pow(2,i);

i++;

}

cout<<sum<<endl;

}

}