Kotlin Expression, Statements, and Blocks

Kotlin statement expression: In this tutorial, you will learn about Kotlin expressions, Kotlin statements, differences among expressions and statements, and Kotlin blocks.

Kotlin Expressions

Like other programming languages, Kotlin expression is the building block of any kotlin program that is generally created to produce new value. In some cases, it is used to simply assign a value to a variable. Kotlin expression is created using values, variables, operators, or technique calls. At long last, expressions results in a single value.

Expressions comprise of variables, operators and so forth that assesses to a single value.

Let’s take an example,

val score: Int
score = 90 + 25

Here, 90 + 25 is an expression that returns Int value.

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In Kotlin, if is an articulation dissimilar to Java (In Java, if is a statement). For instance,

fun main(args: Array<String>) {

    val a = 12
    val b = 13
    val max: Int

    max = if (a > b) a else b
    println("$max")
}

Here, if (a > b) a else b is an articulation. At that point value of the articulation is appointed to max variable in the above program.

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Kotlin Statements

Statements are all that make up a total unit of execution. For instance,

val score = 90 + 25

Here, 90 + 25 is an expression that returns 115, and val score = 9*5; is a statement.

Expressions are part of statements.

some examples:

println("Howdy")

var a = 5
++a

max = if (a > b) a else b

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Kotlin Blocks

A block is a group of statements (zero or more) that is encased in curly braces { }. For instance,

fun main(args: Array<String>) {  // main function block
    val flag = true

    if (flag == true) {      // start of if block
        print("Hey ")
        print("sohail!")
    }                        // end of if block
}                            // end of main function block

There are two statements print(“Hey “) and print(” sohail!”) inside if branch block.

print("Hey ")
print("sohail!")

Additionally, the main() work likewise has a block body.

val flag = true

if (flag == true) {      // start of block
    print("Hey ")
    print("sohail!")
}                        // end of block

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Kotlin Introduction