C/C++: goto into the for loop

Question

I have a bit unusual situation - I want to use goto statement to jump into the loop, not to jump out from it.

There are strong reasons to do so - this c

Answer 1

First, I need to say that you must reconsider doing this some other way. I've rarely seen someone using goto this days if not for error management.

But if you really want to stick with it, there are a few things you'll need to keep in mind:

• Jumping from outside the loop to the middle won't make your code loop. (check the comments below for more info)

• Be careful and don't use variables that are set before the label, for instance, referring to *data_to_request. This includes iwhich is set on the for statement and is not initialized when you jump to the label.

Personally, I think in this case I would rather duplicate the code for ...process data... then use goto. And if you pay close attention, you'll notice the return statement inside your for loop, meaning that the code of the label will never get executed unless there's a goto in the code to jump to it.

function foo(int not_a_first_call, int *data_to_request, ...other parameters... )
{
    int i = 0;
    if( not_a_first_call )
    {
        ...process data...
        *data_to_request = i;
        return;
    }

    for (i=0; i