Write a program in C++ to convert a binary number into a decimal number using math function. .

.#include <iostream>
using namespace std;
void main()
{
    int n1, n;
int dec=0,i=0,j,d;

     cout<<"Convert Binary to Decimal:\n ";
     cout<<"\n";
cout<<"Input  the binary number :";
cin>>n;
n1=n;
while(n!=0)
{  d = n % 10;
  dec=dec+d*pow(2,i);
  n=n/10;
  i++;
}
        cout<<"\nThe Binary Number : "<<n1<<"\nThe equivalent Decimal  Number is : "<<dec<<endl;

      system ("pause");
}

Test Data : 

Input the binary number :1010100

Expected Output :

The Binary Number : 1010100 

The equivalent Decimal Number is : 84