Binary to decimal CPP

#include <iostream>
using namespace std;

// Function to convert binary to decimal
int binaryToDecimal(int n)
{
int num = n;
int dec_value = 0;

// Initializing base value to 1, i.e 2^0
int base = 1;

int temp = num;
while (temp) {
	int last_digit = temp % 10;
	temp = temp / 10;

	dec_value += last_digit * base;

	base = base * 2;
}

return dec_value;

}

int main()
{
int num ;
cin>>num;

cout << binaryToDecimal(num) << endl;

}