what is Check and uncheck in c#, when to use?

Anand

3 Replies

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Ashutosh Gupta6y ago
Accepted answer
if you push more data from RHS to LHS ( z = x + y) and overflow happens of data in such cases we use checked keyword to throw expectation. Uncheck is default does not throw any expectation. For constant values complier check data by default but for normal values it does not give any warning in such case checked word is useful.
Rajanikant Hawaldar6y ago
Hi Anand, Read these articles explained in detail.
https://www.c-sharpcorner.com/blogs/use-of-checked-and-unchecked-keyword-in-c-sharp1
https://www.c-sharpcorner.com/blogs/checked-and-unchecked-in-c-sharp

Those are operators that check (or do not check) for overflow in the resulting numerical operation. In the checked case, an OverflowException exception is raised if the result of the operation exceeds the minimum or maximum value allowed for the datatype https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/checked-and-unchecked
Shweta Lodha6y ago
In case of checked, exceptions will be raised for arithmatic operations whenenver overflow occurs, whereas in case of unchecked, no exceptions will be raised even if overflow occurs. Let's take an example:

int value = 2,147,483,647; // this is max value of integer;
var checkedResult = checked(value + 100); // this will raise an exception as checked is used.
var UncheckedResult = unchecked(value + 100); // this will not raise an exception as unchecked is used.