cpp, c++, c, read numbers

gistfile1.cpp

// Input sequence of numbers
while (1)
{
        ch = getchar_unlocked();
        if (ch == EOF)
        {
            // do something with N
            break;
        }
            
        else if (ch == '\n')
        {
            // do something with N
            N = 0;
        }
        
        else
            N = (N << 3) + (N << 1) + ch - '0'; 
}