Why the loop becomes infinite? [closed]

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Make your loop variable an int.

unsigned char can’t exceed 255, so incrementing i past that will wrap it to 0.

2*130 is 260, because the type of literal 2 is int, and multiplying an int by unsigned char you get an int.

Thus, when i is an unsigned char, your loop termination condition will never be satisfied since i will always be less than 260, hence the infinite looping.

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