Though C89 does not support declaration of a scoped loop variable like C99 does:

    for(int i = 0; i < 10; i++) {
        // ...
    }

C89 does support declaration of variables at the top of braced blocks whose scope is limited to that block:

    {
        int i;
        for(i = 0; i < 10; i++) {
            // ...
        }
    }