This is a good practice, of course. But, if you hace a large code, maybe this could be dificult to read.

To remove the warning you may initialize i as unsigned long rather than int, or cast sizeof(strings)/sizeof(char*) to int (this way (int) sizeof(strings)/sizeof(char*)). Though it's not likely to be the cause of your code failing. Seems hard to say without more elements.

I am facing the same error! Did you find the solution?