KOTLIN: Basic Syntax - Revision history

Onnowpurbo: /* Packages in Kotlin */

2022-07-24T02:28:54Z

Packages in Kotlin

Onnowpurbo: /* Semicolon (;) in Kotlin */

2022-07-24T02:28:16Z

Semicolon (;) in Kotlin

Onnowpurbo: /* Entry Point with Parameters */

2022-07-24T02:22:55Z

Entry Point with Parameters

Onnowpurbo: /* Kotlin Program Entry Point */

2022-07-24T02:18:24Z

Kotlin Program Entry Point

Onnowpurbo at 02:02, 22 July 2022

2022-07-22T02:02:41Z

Onnowpurbo: Created page with "Sumber: https://www.tutorialspoint.com/kotlin/kotlin_basic_syntax.htm Kotlin Program Entry Point An entry point of a Kotlin application is the main() function. A function ca..."

2022-07-18T00:56:48Z

Created page with "Sumber: https://www.tutorialspoint.com/kotlin/kotlin_basic_syntax.htm Kotlin Program Entry Point An entry point of a Kotlin application is the main() function. A function ca..."

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Sumber: https://www.tutorialspoint.com/kotlin/kotlin_basic_syntax.htm

Kotlin Program Entry Point
An entry point of a Kotlin application is the main() function. A function can be defined as a block of code designed to perform a particular task.

Let's start with a basic Kotlin program to print "Hello, World!" on the standard output:

fun main() {
var string: String = "Hello, World!"
println("$string")
}
When you run the above Kotlin program, it will generate the following output:

Hello, World!
Entry Point with Parameters
Another form of main() function accepts a variable number of String arguments as follows:

fun main(args: Array<String>){
println("Hello, world!")
}
When you run the above Kotlin program, it will generate the following output:

Hello, World!
If you have observed, its clear that both the programs generate same output, so it is very much optional to pass a parameter in main() function starting from Kotlin version 1.3.

print() vs println()
The print() is a function in Kotlin which prints its argument to the standard output, similar way the println() is another function which prints its argument on the standard output but it also adds a line break in the output.

Let's try the following program to understand the difference between these two important functions:

fun main(args: Array<String>){
println("Hello,")
println(" world!")

print("Hello,")
print(" world!")
}
When you run the above Kotlin program, it will generate the following output:

Hello,
world!
Hello, world!
Both the functions (print() and println()) can be used to print numbers as well as strings and at the same time to perform any mathematical calculations as below:

fun main(args: Array<String>){
println( 200 )
println( "200" )
println( 2 + 2 )

print(4*3)
}
When you run the above Kotlin program, it will generate the following output:

200
200
4
12
Semicolon (;) in Kotlin
Kotlin code statements do not require a semicolon (;) to end the statement like many other programming languages, such as Java, C++, C#, etc. do need it.

Though you can compile and run a Kotlin program with and without semicolon successfully as follows:

fun main() {
println("I'm without semi-colon")

println("I'm with semi-colon");
}
When you run the above Kotlin program, it will generate the following output:

I'm without semi-colon
I'm with semi-colon
So as a good programming practice, it is not recommended to add a semicolon in the end of a Kotlin statement.

Packages in Kotlin
Kotlin code is usually defined in packages though package specification is optional. If you don't specify a package in a source file, its content goes to the default package.

If we specify a package in Kotlin program then it is specified at the top of the file as follows:

package org.tutorialspoint.com

fun main() {
println("Hello, World!")
}
When you run the above Kotlin program, it will generate the following output:

Hello, World!
Quiz Time (Interview & Exams Preparation)
Q 1 - Kotlin main() function should have a mandatory parameter to compile the code successfully:

A - True

B - False

Q 2 - What will be the output of the following Kotlin program

fun main() {
println("1"); println("2")
}
A - This will give a syntax error

B - It will print 12

C - 1 followed by 2 in the next line

D - None of the above

Q 3 - Which of the following statement is correct in Kotlin

A - A Kotlin program must have a main() function

B - A Kotlin program can be compiled without a main() function

C - It is mandatory to have a print() or println() functions in a Kotlin program

D - All statements are correct from Kotlin programming point of view

==Referensi==

* https://www.tutorialspoint.com/kotlin/kotlin_basic_syntax.htm

@@ Line 131: / Line 131: @@
 If we specify a package in Kotlin program then it is specified at the top of the file as follows:
 package org.tutorialspoint.com
   fun main() {
@@ Line 138: / Line 144: @@
 When you run the above Kotlin program, it will generate the following output:
   Hello, World!

@@ Line 99: / Line 99: @@
 Though you can compile and run a Kotlin program with and without semicolon successfully as follows:
   fun main() {
@@ Line 107: / Line 114: @@
 When you run the above Kotlin program, it will generate the following output:
   I'm without semi-colon
@@ Line 112: / Line 122: @@
 So as a good programming practice, it is not recommended to add a semicolon in the end of a Kotlin statement.
 ==Packages in Kotlin==

@@ Line 27: / Line 27: @@
 Another form of main() function accepts a variable number of String arguments as follows:
   fun main(args: Array<String>){
@@ Line 33: / Line 36: @@
 When you run the above Kotlin program, it will generate the following output:
   Hello, World!
@@ Line 38: / Line 43: @@
 If you have observed, its clear that both the programs generate same output, so it is very much optional to pass a parameter in main() function starting from Kotlin version 1.3.
-print() vs println()
+Jika Anda telah mengamati, jelas bahwa kedua program menghasilkan output yang sama, jadi sangat opsional untuk melewatkan parameter dalam fungsi main() mulai dari Kotlin versi 1.3.
 The print() is a function in Kotlin which prints its argument to the standard output, similar way the println() is another function which prints its argument on the standard output but it also adds a line break in the output.
 Let's try the following program to understand the difference between these two important functions:
   fun main(args: Array<String>){
@@ Line 52: / Line 66: @@
 When you run the above Kotlin program, it will generate the following output:
   Hello,
@@ Line 58: / Line 74: @@
 Both the functions (print() and println()) can be used to print numbers as well as strings and at the same time to perform any mathematical calculations as below:
   fun main(args: Array<String>){
@@ Line 68: / Line 86: @@
 When you run the above Kotlin program, it will generate the following output:

@@ Line 2: / Line 2: @@
-Kotlin Program Entry Point
+==Kotlin Program Entry Point==
 An entry point of a Kotlin application is the main() function. A function can be defined as a block of code designed to perform a particular task.
 Let's start with a basic Kotlin program to print "Hello, World!" on the standard output:
-fun main() {
+ fun main() {
-   var string: String  = "Hello, World!"
+    var string: String  = "Hello, World!"
-   println("$string")
+    println("$string")
-−
+ }
 When you run the above Kotlin program, it will generate the following output:
-Hello, World!
+ Hello, World!
 Entry Point with Parameters
 Another form of main() function accepts a variable number of String arguments as follows:
-fun main(args: Array<String>){
+ fun main(args: Array<String>){
-    println("Hello, world!")
+     println("Hello, world!")
-−
+ }
 When you run the above Kotlin program, it will generate the following output:
-Hello, World!
+ Hello, World!
 If you have observed, its clear that both the programs generate same output, so it is very much optional to pass a parameter in main() function starting from Kotlin version 1.3.
@@ Line 30: / Line 36: @@
 Let's try the following program to understand the difference between these two important functions:
-fun main(args: Array<String>){
+ fun main(args: Array<String>){
-    println("Hello,")
+     println("Hello,")
-    println(" world!")
+     println(" world!")
 When you run the above Kotlin program, it will generate the following output:
-Hello,
+ Hello,
-world!
+ world!
-Hello, world!
+ Hello, world!
 Both the functions (print() and println()) can be used to print numbers as well as strings and at the same time to perform any mathematical calculations as below:
-fun main(args: Array<String>){
+ fun main(args: Array<String>){
-    println( 200 )
+     println( 200 )
-    println( "200" )
+     println( "200" )
-    println( 2 + 2 )
+     println( 2 + 2 )
 When you run the above Kotlin program, it will generate the following output:
-−
-−
-−
-−
 Semicolon (;) in Kotlin
 Kotlin code statements do not require a semicolon (;) to end the statement like many other programming languages, such as Java, C++, C#, etc. do need it.
 Though you can compile and run a Kotlin program with and without semicolon successfully as follows:
-fun main() {
+ fun main() {
-    println("I'm without semi-colon")
+     println("I'm without semi-colon")
-−
-    println("I'm with semi-colon");
+     println("I'm with semi-colon");
-−
+ }
 When you run the above Kotlin program, it will generate the following output:
-I'm without semi-colon
+ I'm without semi-colon
-I'm with semi-colon
+ I'm with semi-colon
 So as a good programming practice, it is not recommended to add a semicolon in the end of a Kotlin statement.
-Packages in Kotlin
+==Packages in Kotlin==
 Kotlin code is usually defined in packages though package specification is optional. If you don't specify a package in a source file, its content goes to the default package.
@@ Line 80: / Line 94: @@
 package org.tutorialspoint.com
-fun main() {
+ fun main() {
-    println("Hello, World!")
+     println("Hello, World!")
-−
+ }
 When you run the above Kotlin program, it will generate the following output:
-Hello, World!
+ Hello, World!
 Quiz Time (Interview & Exams Preparation)
 Q 1 - Kotlin main() function should have a mandatory parameter to compile the code successfully: