Modest

Variable Definition

Variable definition creates new variable instance.

Common forms

1. Variable definition without default value. It will be initialized with zero value.

   var <#identifier#> : <#type_expression#>
   

2. Variable definition without explicit type specification, with default value (it must have Non-Generic type). Type of variable will be the same as default value type.

   var <#identifier#> = <#default_value_expression#>
   

3. Variable definition with explicit type specification and default value. Default value will be implicit casted to type of variable definition.

   var <#identifier#> : <#type_expression#> = <#default_value_expression#>
   

Global variables

Variable definition outside function body creates new local variable instance.

Global variables example

var x: Int16
var y = Int32 10
var z: Int32 = 20

public func main () -> Int32 {
	printf("x = %hd\n", x)
	printf("y = %d\n", y)
	printf("z = %d\n", z)

	return 0
}

Result:

x = 0
y = 10
z = 20

var counter: Int

func count () -> Unit {
	++counter
}

public func main () -> Int {
	printf("before counter = %i\n", counter)

	// call function count for ten times
	var i: Nat32 = 0
	while i < 10 {
		count()
		++i
	}

	printf("after counter = %i\n", counter)

	return 0
}

Local variables

Variable definition inside function body creates new local variable instance.

Global variables example

func mid (a: Int32, b: Int32) -> Int32 {
	var result: Int32
	result = a + b
	result = result / 2
	return result
}

public func main () -> Int32 {
	var x: Int16
	var y = Int32 10
	var z: Int32 = 10

	// We need to initialize x with some value
	// because local variable without default value
	// will contains 'garbage' value from memory
	// (some kind of 'random' value)
	x = 5

	printf("x = %hd\n", x)
	printf("y = %d\n", y)
	printf("z = %d\n", z)

	return 0
}

Result:

x = 5
y = 10
z = 20

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