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Message: [QUOTE="Keith Thompson, post: 1685863"] Quick answer: Yes. The standard requires an implementation to handle at least 127 nesting levels of blocks (the actual statement is more complicated than that, but the details aren't important for this discussion). Realistically, most compilers don't use fixed-size data structures internally, so the number of nested loops is going to be limited by the compiler running out of memory, not by any fixed upper bound. The compiler will let you have far more levels of nested loops than you should. Note that nested loops don't have to be physically nested. It's very common for a function to be called from within a loop, and for the function itself to execute a loop, and so on to arbitrarily many levels. Done properly, this can avoid the discombobulation you're quite rightly concerned about. [/QUOTE]