Why is int rather than unsigned int used for C and C++ for loops?

Question

This is a rather silly question but why is int commonly used instead of unsigned int when defining a for loop for an array in C or C++?

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Answer 1

Because unless you have an array with size bigger than two gigabyts of type char, or 4 gigabytes of type short or 8 gigabytes of type int etc, it doesn't really matter if the variable is signed or not.

So, why type more when you can type less?