Infinite loop when using size_t in a count down for loop

Question

So I\'m using size_t instead of int in any indexing for loop to prevent negative indices. But when counting down, this leads to an overflow:

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Answer 1

The problem is that in in your implementation size_t has type unsigned long or unsigned int.

When i=0 the condition is accomplished and --i will transform it to 4294967295UL = ULONG_MAX, so the test condition i >= 0 from the loop will never be false .

size_t has some unsigned type, i will never be negative.