converting Binary Numbers in to decimal numbers

Question

I need a program to convert Binary numbers into Decimal number in Java or in C++.

is there some one who can help me.

Answer 1

Algorithmically (in c/c++):

const char* binary = "110010101011";
int decimal = 0;

while ( *binary ) 
{
    decimal*=2;
    decimal+=*binary-'0';
    binary++ ;
 }

Note that this doesn't handle invalid characters (anything other than binary digits).