int int1 = 1;
int int2 = 2;
switch(int1)
{
   case int2:
      doSomething();
      break;
}

Here's an example of when I get this error, is there a way to do something like that without getting the "CS0150: A constant value is expected" error, or do I have to use if statements?

CodePudding user response：

It should be case 2, not case int2. case should have a constant value not a variable.

CodePudding user response：

You would have to use an if statement to accomplish what you want, or make int2 const.

Tutorials Point does a good job of explaining this:

The following rules apply to a switch statement −

The expression used in a switch statement must have an integral or enumerated type, or be of a class type in which the class has a single conversion function to an integral or enumerated type.

You can have any number of case statements within a switch. Each case is followed by the value to be compared to and a colon.

The constant-expression for a case must be the same data type as the variable in the switch, and it must be a constant or a literal.

When the variable being switched on is equal to a case, the statements following that case will execute until a break statement is reached.

When a break statement is reached, the switch terminates, and the flow of control jumps to the next line following the switch statement.

Not every case needs to contain a break. If no break appears, then it will raise a compile time error.

A switch statement can have an optional default case, which must appear at the end of the switch. The default case can be used for performing a task when none of the cases is true.