Thread: implicit declaration of function warning

here is a rough view of my code (original is far to big to post here)

Code:

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int break_loop = 1;
    
    for (;;)
    {
        while (break_loop == 1)
        {
            //ask player for old co-ordinates
            //ask user for new co-ordinates
            //do stuff with co-ordinates
            //if everything ok break_loop = 0
        }
        //call a function
    }
    return 0;
}

when i compile i get a warning implicit declaration of function although everything works fine as far as i can tell.

apart from being an oxymoron what does the warning mean and should i be worried about it.
coop

oops forgot to include the header file...... duh!!!!
that's why when i tried to mimic the issue i didn't get it
thanks for the help
coop

This isn't what you were asking about, but there are a few better ways you could arrange those loop.

Code:

for (;;) {
    for(int loop = 1; loop;) {
        // ...
        if(ok) loop = 0;
    }
    func();
}

Move the variable that controls the loop in as far as you can get it. Limiting the scope of your variables as much as possible is always a good thing. I also renamed it, boolean variables should have a positive meaning. If we want to keep looping, loop is true. Having a variable called "break loop" that breaks the loop when it's 0 is more than a little confusing, someone (possibly future you) is going to come along and make an incorrect assumption about the purpose of that variable and possibly cause a bug.

Or... well, just the break keyword.

Code:

for (;;) {
    for(;;) {
        // ...
        if(ok) break;
    }
    func();
}