Looping in C Programming Language

 Looping in C Programming Language

• Use: When we want to perform specific task repeatedly then we can use looping.
• In C Language there are three type of loop:
1. For Loop
2. While Loop
3. Do while Loop
4. Nested for Loop
• Each Loop statement requires three things:
1. Initialization 
2. Test Condition
3. Increment/Decrement Operation

1. For Loop:

• For Loop is a repetition control structure which allow us to write a loop that is executed a specific number of time.
• Syntax:

            for( initialization ; test condition; increment/decrement operation) 

            {

                ------

                body of for loop;

                ------

            }

2. While Loop:

• While Loop is use to per to perform specific task repeatedly.
• Syntax:

            initialization

            while( test condition )

            {

                --------

                body of loop;

                -------

                increment/decrement;

            }

• In while loop initialization before while loop.
• After that condition is checked in while statement.
• while loop will be executed when condition is true.
• Increment or Decrement is done in body part of while loop.
• while loop is terminated when condition is false.

3. Do While Loop:

• Do while loop is use to perform specific task repeatedly.
• Syntax:

        <initialization>

        do

        {

            -------

            body of loop

            ------

            <increment/decrement>

        } while( test condition );

        --------

        --------

• do while is a exit control loop because test condition is check after body of loop.
• do keyword is used at beginning of loop.
• Initialization is done before loop.
• Initialization/Decrement is used in do while loop.
• Initially for the first time body part of do while loop is executed whether the condition is true or false.
• do while loop is executed until the condition is true.
• do while loop is terminated when condition is false.

4. Nested For Loop:

• Nested For Loop is for loop in another for loop.
• Syntax:

            for( initialization ; test condition ; increment/decrement )

            {

                for( initialization ; test condition ; increment/decrement )

                {

                    ------

                    body part of inner for loop;

                }

                -------

                body part of outer for loop;

            }

• In this syntax there are two for loop:
1. Inner For Loop
2. Outer For Loop