Looping Control Structures.

In this article,Looping Control Structures are explained in detail with examples.
These control structures are used to execute a block of statements continuously/iteratively based on a condition.

1.While loop

It is also known as pre-test loop i.e. first, we check the condition and if it is true, then it executes

the body. 

Syntax
initialization;
while(condition)
{
-----
body;
----
increment/decrement;
}

Ex

//program related to Looping Control Structures--while loop

class whileloop

{

public static void main(String args[])

{

int i=0;

while(i<10) // here condition is checked.If true, it enters into the loop and prints the result.

{

System.out.println("Number is: "+i);

i++;

}

System.out.println("End of WhileLoop"); // if condition fails, loop terminates and prints End of loop.

}

}

Output

                            To get the code file use me.

2.Do While loop
It is a post-test loop i.e,Condition is checked after executing the body at least once.
Syntax
Initialization;
do
{
-------
body;
-----
increment/decrement;
}
while(condition);
Ex
//program related to Looping Control Structures--Do While loop
class DoWhileLoop
{
public static void main(String args[])
{
int i=0;
do
{
System.out.println("Number is: "+i);
i++;
}
while(i<10);
System.out.println("End of DoWhileLoop");
}
}
Output

                             To get the code file use me.

3.For loop
It is also pre test loop.It is very efficient looping structure because initialization,condition checking,increment/decrement is done in a single line.  (From topic Looping Control Structures)
Syntax
for(initialization;condition;increment/decrement)
{
------
body;
------
}
Ex
//program related to Looping Control Structures--for loop
class ForLoop
{
public static void main(String args[])
{
for(int i=0;i<10;i++)
{
System.out.println("Numbers are: "+i);
}
System.out.println("End of for loop");
}
}
Output

                          To get the code file use me.

Break Statement using loops.

This statement is used in two situations i.e, switch case control structure and looping control structure.

In switch-case,It is used with case-value statements. (From topic Looping Control Structures)

In looping structures,it is used with a condition when encountered,it takes the control of execution out of looping block,by skipping current iteration remaining statements and also remaining iterations.

Ex

//program related to Looping Control Structures--Forloops break.

class ForLoopBreak

{

public static void main(String args[])

{

for(int i=0;i<10;i++)

{

if(i==6)

break; // here when i=6,loop breaks and proceed to print.

System.out.println("Number is: "+i);

}

System.out.println("Hello world");

}

}

Output

                             To get the code file use me.

Continue Statement using loops.

This statement is used only in looping structures when encountered in a loop, it skips remaining statements of the current iteration and continues with next iteration.
It is also used with a condition in a loop.    (From topic Looping Control Structures)
Ex
//program related to Looping Control Structures--For loop Continue.
class ForLoopContinue
{
public static void main(String args[])
{
for(int i=0;i<15;i++)
{
if(i==2) //here when i=2 then loop continue to next iteration.
continue;
if(i==8)
continue;
if(i==12);
break;
System.out.println("Number is: "+i);
}
System.out.println("End of the program");
}
}
Output

                          To get the code file use me.

Continue to the next topic Nested Loop and labeled break and labeled continue.

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