https://stackoverflow.com › questions › 58212508

Reason is variables are not defined before they are used. Following changes added to the code. since you have named functions as "getSomeValue ()" better to use a return type instead of void. its better to use double instead of int, because there are divisions in the calculation.

https://stackoverflow.com › questions › 51462248

You must declare the variable (size3) in a scope where it can be accessed. In your case just declare this (int size3;) in outside and before calling if condition. then just assign values. It will solve the problem. int size3 ; if (size1 > size2) {. size3 = size1; } else.

https://learn.microsoft.com › en-us › cpp › error-messages › compiler-errors-1 › compiler-error...

The most common causes of C2065 are that the identifier hasn't been declared, the identifier is misspelled, the header where the identifier is declared isn't included in the file, or the identifier is missing a scope qualifier, for example, cout instead of std::cout.

https://en.cppreference.com › w › c › language › identifier

The following identifiers are reserved and may not be declared in a program (doing so invokes undefined behavior): The identifiers that are keywords cannot be used for other purposes. In particular #define or #undef of an identifier that is identical to a keyword is not allowed.

https://www.gnu.org › software › c-intro-and-ref › manual › html_node › Identifiers.html

An identifier (name) in C is a sequence of letters and digits, as well as ‘ _ ’, that does not start with a digit. Most compilers also allow ‘ $ ’. An identifier can be as long as you like; for example, int anti_dis_establishment_arian_ism; Letters in identifiers are case-sensitive in C; thus, a and A are two different identifiers.

https://cs50.stackexchange.com › questions › 6070 › why-do-i-get-an-undefined-identifier...

If you try to use the name of a variable or a function that hasn't been declared you will get an "undeclared identifier" error. You issue deals with scoping. To fix your issue you need to declare the variable height before the while lope.

http://docs.cs.uct.ac.za › cpp › reference › en › c › language › identifier.html

The following identifiers are reserved and may not be declared in a program (doing so invokes undefined behavior): 1) The identifiers that are keywords cannot be used for other purposes. In particular #define or #undef of an identifier that is identical to a keyword is not allowed.

https://learn.microsoft.com › en-us › cpp › error-messages › compiler-errors-2 › compiler-error...

To fix this error, compare use of identifier to the identifier declaration for case and spelling. Verify that scope resolution operators and namespace using directives are used correctly. If the identifier is declared in a header file, verify that the header is included before the identifier is referenced.

https://github.com › microsoft › vscode-cpptools › issues › 8149

Could you provide sample code that produces the error "identifier is undefined" but definition is found (with extern C)? Also, could you share logs from running C/C++: Log Diagnostics from the VS Code command palette?