How to add a if condition in this block of code!

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C++

C

This is block of Sutherland line clipping. I am trying to add a condition here which says "No need of Clipping" if line is inside viewport. But when i am adding this condition its not getting executed. Even if line is inside viewport the message is not showing.

What I have tried:

void cohenSutherland(double x1, double y1,
                      double x2, double y2)
{
    int code1 = compute(x1, y1);
    int code2 = compute(x2, y2);
    bool accept = false;
    while (true)
    {
        if ((code1 == 0) && (code2 == 0))
        {
            accept = true;
            break;
        }
        else if (code1 & code2)
        {
            break;
        }
        else
        {
            int code_out;
            double x, y;
            if (code1 != 0)
                code_out = code1;
            else
                code_out = code2;
            if (code_out & TOP)
            {
                x = x1 + (x2 - x1) * (y_max - y1) / (y2 - y1);
                y = y_max;
            }
            else if (code_out & BOTTOM)
            {
                x = x1 + (x2 - x1) * (y_min - y1) / (y2 - y1);
                y = y_min;
            }
            else if (code_out & RIGHT)
            {
                y = y1 + (y2 - y1) * (x_max - x1) / (x2 - x1);
                x = x_max;
            }
            else if (code_out & LEFT)
            {
                y = y1 + (y2 - y1) * (x_min - x1) / (x2 - x1);
                x = x_min;
            }

            if (code_out == code1)
            {
                x1 = x;
                y1 = y;
                code1 = compute(x1, y1);
            }
            else
            {
                x2 = x;
                y2 = y;
                code2 = compute(x2, y2);
            }
        }
    }
    if (accept)
    {
        cout <<"Line accepted from " << x1 << ", "
             << y1 << " to "<< x2 << ", " << y2 << endl;
        ClearDev();
        drawBoundary();
        draw(x1,y1,x2,y2);
    }
    else
        cout << "Line rejected" << endl;
}