Convert Binary Stream/String to decimal number in C,C++

Again, there may be multiple way to doing it but I am listing one of the way which work for me.
Here is the code :

#include <iostream>
#include <conio.h>

using namespace std;

int BinaryStream_To_Decimal(char* str)
{
  int result = 0;

  for (int len = strlen(str) - 1, count = 0; *str != '\0'; ++count, ++str)
  {
    if (*str == '1')
    {
      result += pow(2, len - count);
    }
  }

  return result;
}

void main()
{
  char* binaryString = "111";

  cout << BinaryStream_To_Decimal(binaryString) << endl;

  _getch();
}

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