Iterative Statements

Iterative statements are used when you need to keep repeating statements until the condition for termination is not met. These types of statements are normally exhibited in:

1) for loops

• For loops are used for definite loops where the number of iterations is known.

• A for loop starts with an initialization followed by a condition and increment/decrement.

Consider a simple for loop that prints numbers from 1 to 10.

The FizzBuzz problem as explained on our AlgoDaily Youtube channel(https://youtu.be/giS2G3TCmWI) is a classic example of using for loops to solve a problem.

1public class fizzbuzz {
2
3    public static void main(String[] args) {
4        for (int i = 1; i <= 100; i++) {
5
6            if (i % 3 == 0 && i % 5 == 0) {
7
8                System.out.println("FizzBuzz");
9            } else if (i % 3 == 0) {
10
11                System.out.println("Fizz");
12            } else if (i % 5 == 0) {
13
14                System.out.println("Buzz");
15
16            } else {
17
18                System.out.println(i);
19            }
20
21        }
22    }
23}

In this program, the statements are repeated until the conditions are met. The fizz buzz program details what numbers are divisible by 3, 5, and both 3 and 5. However, as aforementioned, see a more detailed explanation from the AlgoDaily youtube channel.

2) While loops

• While loops are used when the number of iterations is not known.

• In contrast to for loops, there is no built-in loop control variable.

1public class Example {
2
3    public static void main(String[] args) {
4        int i = 0;
5
6        while (i < 11) {
7
8            System.out.println(i);
9            i++;
10
11        }
12
13    }
14
15}

The above example shows the condition specified within the loop. While the number i is less than 11 then the print statement is continuously executed. The i is used as a built in control variable.

3) Do while loops

• Do while loops follow a similar structure as while loops however the statement is executed first before evaluating the condition.

In the example attached, we are printing the value of the i and incrementing first. Then check the condition in the while looking to see if the number i is less than 11.