Learn While-Loop

while Loop

The while loop is the simplest example of a loop in action. This loop will repeatedly execute a code block as long as the condition inside the condition block evaluates to true. Once the condition returns false, the loop execution will stop.

Main.java


              123
            
while (condition) {
    // code to be executed
}

The while loop works as follows:

The condition is checked before each iteration; if true, the loop runs, if false, it ends;
The loop can contain one or more statements, executed repeatedly while the condition is true;
Ensure the condition eventually becomes false to avoid an infinite loop.

Here's an example to demonstrate the while loop:

Main.java


              123456789101112131415
            
package com.example;

public class Main {
    public static void main(String[] args) {
        int a = 0;
        int b = 10;
        while (a != b) {
            a = a + 1;
            System.out.println("a has value: " + a);
            b = b - 1;
            System.out.println("b has value: " + b);
        }
        System.out.println("Is a equal to b: " + (a == b));
    }
}

In our loop, we set a condition that reads as follows: as long as the value of variable a is not equal to the value of variable b, we increment variable a and decrement variable b. When their values are equal, we terminate the while loop.

Task

Swipe to start coding

Find the sum of a range of numbers from 1 to n.

Create a method called sumFrom1ToN(int n) that returns an int result.
Inside the method, define two variables:
- sum (to store the total).
- current (starting from 1).
Use a while loop to repeat the following steps until current is greater than n:
- Add the value of current to the sum.
- Increment current by 1.
Return the total sum at the end of the loop.

Solution

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Section 3. Chapter 2

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while Loop

Main.java


              123
            
while (condition) {
    // code to be executed
}

The while loop works as follows:

The condition is checked before each iteration; if true, the loop runs, if false, it ends;
The loop can contain one or more statements, executed repeatedly while the condition is true;
Ensure the condition eventually becomes false to avoid an infinite loop.

Here's an example to demonstrate the while loop:

Main.java


              123456789101112131415
            
package com.example;

public class Main {
    public static void main(String[] args) {
        int a = 0;
        int b = 10;
        while (a != b) {
            a = a + 1;
            System.out.println("a has value: " + a);
            b = b - 1;
            System.out.println("b has value: " + b);
        }
        System.out.println("Is a equal to b: " + (a == b));
    }
}

Task

Swipe to start coding

Find the sum of a range of numbers from 1 to n.

Create a method called sumFrom1ToN(int n) that returns an int result.
Inside the method, define two variables:
- sum (to store the total).
- current (starting from 1).
Use a while loop to repeat the following steps until current is greater than n:
- Add the value of current to the sum.
- Increment current by 1.
Return the total sum at the end of the loop.

Solution

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Everything was clear?

Thanks for your feedback!

Section 3. Chapter 2

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