You can give whole code(from displaying menu) inside a while loop and give condition as true so that after using a case it will automatically repeat(as you are using 6 to EXIT). And if any invalid input is given for eg:10 the case will go to default section and will execute the code there
The part you’re missing is converting from the integer to the type-safe enum. Java will not do it automatically. There’s a couple of ways you can go about this: Use a list of static final ints rather than a type-safe enum and switch on the int value you receive (this is the pre-Java 5 approach) … Read more
There is no syntax in C++ nor C# for the second method you mentioned. There’s nothing wrong with your first method. If however you have very big ranges, just use a series of if statements.
The C++ standard says: It is possible to transfer into a block, but not in a way that bypasses declarations with initialization. A program that jumps from a point where a local variable with automatic storage duration is not in scope to a point where it is in scope is ill-formed unless the variable has … Read more
I would like to use an enum value for a switch statement. Is it possible to use the enum values enclosed in “{}” as choices for the switch()“? I know that switch() needs an integer value in order to direct the flow of programming to the appropriate case number. If this is the case, do … Read more
In switch, the expression must be of “an integral type or of a class type for which there is an unambiguous conversion to integral type” (quoting VS2008 docs). A string class doesn’t have “unambiguous conversion to integral type”, like a char does. As a work-around: Create a map<string, int> and switch on the value of the map: switch(command_map[command]) ` Do a set of if/else instead of … Read more
Replace with So this will really be a constant as in “determined at compilation”. The specification precises that a “SwitchLabel” must be case followed by a constant expression case followed by the name of an enum value or default What is considered a valid constant expression is described here in the specification. It’s fairly limited.
See gjvdkamp’s answer; this feature now exists in C# I usually use a dictionary of types and delegates. It’s a little less flexible as you can’t fall through cases, continue etc. But I rarely do so anyway.
C is not Swift. You’ll be happier if you structure your switch statements using curly braces round all of the cases interiors, like this: The extra level of curly braces allows you to do things you can’t do otherwise.
As with most things you should pick which to use based on the context and what is conceptually the correct way to go. A switch is really saying “pick one of these based on this variables value” but an if statement is just a series of boolean checks. As an example, if you were doing: … Read more