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Loops In Java

A loop (iteration) is a sequence of instructions that is continually repeated until a certain condition is reached. Loops are different in syntax but their basic functionality is same. Loops are beneficial when you’re going to reuse a certain code sequence several times.

There are three main types of loops in java-

  1. for loop

  2. while loop

  3. do-while loop


for loop : A for loop is a repetition control structure that allows you to write a loop that needs to be executed a specific number of times.

A for loop is useful when you know how many times a task is to be repeated.


Syntax-

for ( Initialization; Condition; Increment/ Decrement) {

//code to be executed

}


Initialization- This step executes first and only only once at the beginning of the for loop.

Condition-If it's true the loop execute and the control jump to the Incrementation/ Decrementation

Incrementation/ Decrementation- Here we increment or decrement the loop counter value. this executes at the end of each iteration after the code block has been executed.

Note_ Do not forget to increase the variable used in the condition, otherwise the loop will never end!


Flowchart


Example: The example below will print the numbers 1 to 6


Output:



while loop- When the number of iteration is not fixed we use while loop. it is called entry-controlled loop too. In while loop we only give condition. Initialization we do separately outside the loop. At last we do incrementation/ decrementation in the loop.


Syntax-


Initialization;

while ( Condition) {

//code to be executed

Incrementation/ Decrementation;

}


Flowchart



Example: The example below will print the numbers 1 to 6

Output:



do/while loop- Do/while loop is a variant of while loop. In this loop code executes at least once without fail because it does not check the condition for the first time.

Syntax-


Initialization;

do {

//code to be executed

Incrementation/ Decrementation;

}

while (Condition) ;


Flowchart



Example: The example below will print the numbers 1 to 6


Output:


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