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Write C++ Program to Convert Binary to Decimal

// CPP Program to Convert Binary to Decimal

#include <iostream>
#include <math.h>

using namespace std;

int main()
{
	long int n, ans = 0;

	cout << "Enter Binary Number :--> ";
	cin >> n;

	int i = 0;
	while(n != 0)
	{
		int digit = n % 10;  //here we take the last digit
		if(digit == 1)
		{
			ans = (digit * pow(2,i)) + ans;	  //formula for the conversion
		}
		n = n / 10;				// reducing the number
		i++;
	}
	cout << "The Decimal Number is :--> " << ans;
	return 0;
}

Output:

Enter Binary Number :--> 101101
The Decimal Number is :--> 45