3 Variables

Beginner

You can declare variables with one of two modifiers: var or let: var makes the variable mutable, while let makes it immutable.

Cangjie can infer the type of the variable most of the time, in this case from a string literal. Because we defined a with the var modifier, we can change its value after initialization.

To specify the type of a variable, place : after its name followed by its type. In this case f is of type String. Pay attention that f has the let modifier, therefore we cannot modify it after initialization.

Thanks to pattern matching in Cangjie, we can declare multiple variables at the same time using tuples. Because we declared a tuple using var modifier, both b and c are also mutable.

Until e is initialized with a value, we cannot use it in any expressions. Calling println(e) would cause an error.

Variables.cj

main() {
    var a = "initial"
    println(a)
    a = "Cangjie Rocks"
    println(a)

    let f: String = "apple"
    println(f)

    var (b, c): (Int64, Int64) = (1, 2)
    println("${b} ${c}")

    var d = true // boolean type inferred
    println(d)

    var e: Int64
    // println(e)   
    // cannot use uninitialized variable
}

// Output: 
// initial
// Cangjie Rocks
// apple
// 1 2
// true