Compiler options

Suggested compiler options

This web page will give you some hints for compiler options that check your code regarding typical unsafe or suspicious programming or supporting new features (C++-17).
These option can be included in

code::blocks by activating the boxes in "Settings" --> "Compiler" --> "Global compiler settings"
compile options for calling the g++ compiler: g++ [options] file.cpp
makefile: CPPLAGS =
suggested compile option: -pedantic -std=c++17 -Wall -Wshadow -Wswitch-default -Wunreachable-code -Wredundant-decls

Recommended warnings for g++ (with decreasing priority):

-Wall (switches on most warnings)
-pedantic (Yes, the name is the behavior)
-Wshadow (checks for shadow variables)
-Wunused-parameter (reports variables in the parameter list of a function that are not used in the function)
-Winit-self (checks for self-initialization as "a = a+1" without previous initialization of "a".)
-Wswitch-default
-Wunreachable-code
-Wredundant-decls
-Wmissing-declarations
-Wfloat-equal (checks for test == in case of float/double variables)
-Wmain (Checks for correct main function)
-Weffc++ (Checks your class (-hierarchy) regarding the book by Scott Meyers)

C++ features:

-std=c++20
-std=c++17

When the compilation produces warnings then you should read carefully the message and change the code such that the warning disappears.

Problem Handling

WINDOWS: The code compiles and links but cannot be executed.

One reason might be the anti virus program (e.g., kaspersky) that blocks the execution.
Here an exception has to be declared for your code.