In this kotlin example we will learn how to reverse an array. To reverse an array we have two methods
reverse()
reversedArray()
By using abpve two method we will write kotlin program to reverse the int array.
Let's get started
Step 1: Create an Array with fixed size.
Step 2: Write for loop to ask user to enter array elements using scanner class
Step 3: Take user inputs and add inside created Int array
Using reversedArray:
Step 4: Now apply reversedArray method on given array. It will reverse the given array and returns new array.
Step 5: Assign return array to new var and print the new array.
import java.util.*
fun main() {
var k:Int;
var inputArray: IntArray =IntArray(5);
val integer = Scanner(System.`in`)
for( k in 0..4)
{
print("Enter an integer at position $k : ")
var enteredinteger:Int = integer.nextInt()
inputArray[k]=enteredinteger
}
println("Given array : ${Arrays.toString(inputArray)}")
var reversedArray = inputArray.reversedArray()
println("Reversed array : ${Arrays.toString(reversedArray)}")
}
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Output:
Enter an integer at position 0 : 12 Enter an integer at position 1 : 1 Enter an integer at position 2 : 23 Enter an integer at position 3 : 14 Enter an integer at position 4 : 123 Given array : [12, 1, 23, 14, 123] Reversed array : [123, 14, 23, 1, 12] |
using reverse(): This reverse method instead of create new array it will modifies original array.
Step 4: Now apply reversed() method on given array.
Step 5: Now print the array.
import java.util.*
fun main() {
var k:Int;
var inputArray: IntArray =IntArray(5);
val integer = Scanner(System.`in`)
for( k in 0..4)
{
print("Enter an integer at position $k : ")
var enteredinteger:Int = integer.nextInt()
inputArray[k]=enteredinteger
}
println("Given array : ${Arrays.toString(inputArray)}")
inputArray.reverse()
println("Reversed array : ${Arrays.toString(inputArray)}")
}
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Output:
Enter an integer at position 0 : 12 Enter an integer at position 1 : 34 Enter an integer at position 2 : 2 Enter an integer at position 3 : 1 Enter an integer at position 4 : 345 Given array : [12, 34, 2, 1, 345] Reversed array : [345, 1, 2, 34, 12] |
Conclusion: In this example we covered how to reverse an array using revers() and reversedArray() methods.
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