Loops | For Loop in C

Loops in C

Hello friends

 Today we will discuss about loops in C programming Language.

Loops are repeatedly executed for a certain number of times.C Programming Language  supports three types of loop control statements for loop,while loop and do_while loop.

For loop allows to execute a set of instructions until a certain condition is satisfied.Conditions may be predefined.It comprises three actions or parameters.These three actions are initialisation, test_condition and Re-evaluation which are separated by semicolons.

Syntax :

for(initialisation,test_condition,re-evaluation)

{}

The initialization sets to an initial value.This statement is executed only once.

The test_condition is a relational expression that determines the number of iterations.

The re-evaluation decides how to make changes in the loop by increment or decrement operations.

We can write for loop in different ways:

1.Infinite loop

for(;;) 

 It goes infinite. It has no arguments/parameters.

for(a=0;a<=20;)

It also goes infinite because 'a' is neither incremented nor decremented.

2.Finite loop

for(a=0;a<=20;a++)

It display values from 0 to 20.

for(a=20;a>=0;a++)

It display values from 20 to 0.

A program to find square root.

For loop in C

Lets take some examples

A program to find the sum of the given series.

A program to display the stars using for loop

A program to display the series of numbers using for loop