I've been trying to use the ToInt function, but it doesn't work. I get the error message Error running script: Function not found: 'ToInt'.

Help please. Where can I find the function/what do I need to do to make it?

It is probably the way you are using it. You need to use it like this:

s = "456"
n = ToInt(s)

If you do this:

ToInt(s)

... Quest will try to find a function with no return value, fail to find it and give the less-than-helpful error you report.

What I'm trying to do is get the action to perform in a loop, with the user inputting the number of times. So how would I do this?

It looks like ToInt won't be helpful

Like this:

msg("How many times?")
get input {
  number = ToInt(result)
  for (i, 1, number) {
    msg("Iteration " + i)
  }
}

Thanks

to expand upon Pixie's post, about the concept:

Attribute Type and Value Type matter

Strings are text (a collection/sequence of letters, numbers, and other symbols). Concatenation (literally putting together/next to each other) can be done on Strings/text

Integers/Doubles are amounts (arithmetic/math operations can be done on amounts) represented by non-decimal (integers) and decimal (doubles) numbers

String Atribute+Value: game.state = "0"
Integer (int) Attribute+Value: game.state = 0

game.state = "5"
game.state = game.state + 5
// ERROR! can't combine string:"5" and int:5, no comprehension!

game.state = 5
game.state = game.state + "5"
// ERROR! can't combine int:5 and string:"5", no comprehension!

game.state = "5"
game.state = game.state + "5"
// game.state = "55"

game.state = 5
game.state = game.state + 5
// game.state = 10

game.state = "mama"
game.state = game.state + 5
// ERROR! can't combine string:"mama" and int:5, no comprehension!

game.state = "mama"
game.state = game.state + "5"
// game.state = "mama5"

game.state = "mama"
game.state = game.state + "mia"
// game.state = "mamamia"

---------

get input: converts whatever you type in (into the command/text box during game play) into a String Value, and automatically stores it into the built-in 'result' Variable

result <- returned/outputted String Value <- get input () <- (your typed-in input)

get input {
  // your typed-in input is converted into a String Value, by the 'get input' Script/Function
  // automatically (hidden from you) sets/stores your String Value into the built-in 'result' Variable: result = (your typed-in input)
  msg (result)
}

-------

ToInt (String Value): converts the intputted String Value into a returned/outputted Integer (int) Value

VARIABLE <- returned/output Integer Value <- ToInt (input String Value)

game.state_string = "0"
game.state_integer = ToInt (game.state_string)
// game.state_integer = 0

------

and then your other question was on how to do iteration (cycling), which Pixie already covered.