Is there a way to set a range on a case argument in a switch statement in Game Maker: Studio?

Question

Okay so I am making a tower defense game in GML and I came across a small problem when making a switch statement, I want to have anything from 1-10 to result in a variable changing to 1, anything from 11-20 result in the variable changing to 2, and anything 21-30 to change to 3. It would look something like this. Yes I know I'm new to coding..

switch(test)
{
    case (1-10):
        test = 1;
        break;

    case (11-20):
        test = 2;
        break;

    case (21-30):
        test = 3;
        break;
}

Except for the fact that that does not work and to actually do something like that, in my knowledge you'd have to make a case for every single number in the range which would take ~3 years. Help?

Answer 1

According to the documentation it looks like the switch works like it does in other languages and needs to have values known at compiletime, which means you can't use an expression as a case in a switch.
But there is a way to do a switch with a range and that is by skipping the break in some of the case statements. That can become quite tedius and it is probably simpler to use if else, especially in your exemple where it will look like this.

if(test > 0 and test <= 10)
{
    test = 1;
} 
else if (test > 10 and test <= 20)
{
    test = 2;
}
else if (test > 20 and test <= 30)
{
    test = 3;
}

But if you really want to use a switch it will look something like this

switch(test)
{
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 9:
case 10:
   test = 1;
   break;
case 11:
case 12:
case 13:
case 14:
case 15:
case 16:
case 17:
case 18:
case 19:
case 20:
   test = 2;
   break;
case 21:
case 22:
case 23:
case 24:
case 25:
case 26:
case 27:
case 28:
case 29:
case 30:
   test = 3;
   break;
}

Answer 2

You should use if:

if test < 11
{
    test = 1;
}
else if test < 21
{
    test = 2;
}
else if test < 31
{
    test = 3;
}

Another example with different ranges:

if test >= 5 and test <= 10
{
    test = 1;
}
else if test >= 15 and test <= 17
{
    test = 2;
}
else
{
    test = 3;
}

Answer 3

Instead of using a switch or an if-else, you can attempt a math-based approach.

test = floor((test + 9) / 10);

Answer 4

In example if you don't need 1 last digit you can use "div" operator - div, mod (%) - Division and modulo, where div gives you the amount a value can be divided into producing only an integer quotient, while mod gives you only the remainder of a division. Examples of use: secs = time mod 60; time_str = string(time div 60);

Answer 5

key = (test-1) div 10

switch (key) {
    case 1:
    break;

    case 2:
    break;

    case 3:
    break;
}