reapting_blocks.md

Theory: Repeating blocks

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Repeat loop

To use the simplest loop, write repeat(n) and a sequence of statements in curly braces {...}. N is an integer that determines how many times these statements are going to be repeated.

repeat(n) {
    // statements
}

For example, the program below prints Hello three times:

fun main() {
    repeat(3) {
        println("Hello")
    }
}

Output:

Hello
Hello
Hello

• 간단한 반복문이 필요하다면 repeat() {} 로 구현이 가능하다 라는 점.

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Reading and processing data in a loop

You can read data from the standard input, declare variables and even perform calculations inside the repeat statement.

Take a look at this example. The program below reads numbers from the standard input and calculates their sum. The first number is not a part of the sum, it determines the length of the input sequence.

fun main() {    
    val n = readLine()!!.toInt()
    var sum = 0
    
    repeat(n) {
        val next = readLine()!!.toInt()
        sum += next
    }
    
    println(sum)
}

This code reads a length of a number sequence and assigns it to the n variable. After that, it creates a variable to store the total sum. The code reads the next number and adds it to the sum exactly n times. Then, the loop stops, and the program prints the total sum.

Here is an example of input numbers:

5
40
15
30
25
50

Output

160