How to prevent overflow in C++
This article will explain in detail how to prevent spillover in C++, the content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.
Reason (reason)
Overflow usually makes your numeric algorithm meaningless. Incrementing a value beyond a maximum value can lead to memory corruption and undefined behavior.
Overflows often cause digital algorithms to lose their meaning. Incremental operations that exceed the maximum can lead to memory corruption and undefined behavior.
Example, bad (negative example)
Int a [10]
A [10] = 7; / / bad
Int n = 0
While (nasty + < 10)
A [n-1] = 9; / / bad (twice)
Example, bad (negative example)
Int n = numeric_limits::max ()
Int m = n + 1; / / bad
Example, bad (negative example)
Int area (int h, int w) {return h * w;}
Auto a = area (10000,100,000,000); / / badException (exception)
Use unsigned types if you really want modulo arithmetic.
You can use unsigned types if you really need to operate according to the module.
Alternative: For critical applications that can afford some overhead, use a range-checked integer and/or floating-point type.
Optional: for sensitive applications that can withstand some extra overhead, use integers or floating-point numbers with range checks.
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