Lecture 24:- Loop Statements

In Java, loop statements allow you to execute a block of code repeatedly based on a certain condition. There are three types of loop statements in Java:

1. while loop:

   • The while loop repeatedly executes a block of code as long as the given condition is true. It checks the condition before each iteration.

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   while (condition) {    // Code to be executed }

2. do-while loop:

   • The do-while loop is similar to the while loop, but it checks the condition after each iteration. This guarantees that the block of code is executed at least once.

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   do {    // Code to be executed } while (condition);

3. for loop:

   • The for loop is typically used when you know the number of iterations in advance. It consists of three parts: initialization, condition, and iteration expression, separated by semicolons.

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   for (initialization; condition; iteration) {    // Code to be executed }

Here are some examples to demonstrate each loop:

1. while loop example:

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int count = 1; while (count <= 5) {    System.out.println("Iteration " + count);    count++; }

Output:

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Iteration 1 Iteration 2 Iteration 3 Iteration 4 Iteration 5

1. do-while loop example:

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int count = 1; do {    System.out.println("Iteration " + count);    count++; } while (count <= 5);

Output:

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Iteration 1 Iteration 2 Iteration 3 Iteration 4 Iteration 5

1. for loop example:

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for (int i = 1; i <= 5; i++) {    System.out.println("Iteration " + i); }

Output:

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Iteration 1 Iteration 2 Iteration 3 Iteration 4 Iteration 5

Loop statements are powerful tools for automating repetitive tasks and iterating over data structures such as arrays and collections. They are commonly used in programming to make code more efficient and concise.