How to prevent underflow in C++

How to prevent underflow in C++? in view of this question, this article introduces in detail the corresponding analysis and answers, hoping to help more partners who want to solve this problem to find a more simple and feasible way.

Reason (reason)

Decrementing a value beyond a minimum value can lead to memory corruption and undefined behavior.

Reducing a value beyond the minimum can cause memory corruption and undefined behavior.

Example, bad (negative example)

Int a [10]

A [- 2] = 7; / / bad

Int n = 101

While (nMurt -)

A [n-1] = 9; / / bad (twice)

Exception (exception)

Use unsigned types if you really want modulo arithmetic.

If you do need modular operations, you can use unsigned types.

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