Kotlin Program to Generate Multiplication Table

Example 1: Generate Multiplication Table using for loop

fun main(args: Array<String>) {
    val num = 5

    for (i in 1..10) {
        val product = num * i
        println("$num * $i = $product")
    }
}

When you run the program, the output will be:

5 * 1 = 5
5 * 2 = 10
5 * 3 = 15
5 * 4 = 20
5 * 5 = 25
5 * 6 = 30
5 * 7 = 35
5 * 8 = 40
5 * 9 = 45
5 * 10 = 50

Unlike Java, in the above program, we've used ranges and in operator to loop through numbers from 1 to 10.

Here's the equivalent Java code: Java Program to Generate Multiplication Table.

The same multiplication table can also be generated using a while loop in Kotlin.

Example 2: Generate Multiplication Table using while loop

fun main(args: Array<String>) {
    val num = 9
    var i = 1
    
    while (i <= 10) {
        val product = num * i
        println("$num * $i = $product")
        i++
    }
}

When you run the program, the output will be:

9 * 1 = 9
9 * 2 = 18
9 * 3 = 27
9 * 4 = 36
9 * 5 = 45
9 * 6 = 54
9 * 7 = 63
9 * 8 = 72
9 * 9 = 81
9 * 10 = 90

In the above program, unlike a for loop, we have to increment the value of i inside the body of the loop.

Though both programs are technically correct, it is better to use for loop in this case. It's because the number of iteration (from 1 to 10) is known.