INTRODUCTION OF LOOP

Loops are also known as “Iterative statements” because every loop repeats it's body part until the loop’s condition would be true.

TYPES OF LOOPS IN C
In C language there are three types of loops available, which are described below.

1. While loop
2. Do while loop
3. For loop

PARTS OF LOOP
A loop can be divide in the following three sub parts. 

1. Initialization: This part is responsible to initialize the loop’s variable.               
Example (int a=0)

2. Test condition: This statement is used to implement the test criteria and responsible to stop Loop’s execution.  Example while (a<10)

3. Increment or Decrement: These statements are used to change the value of loop’s variable.

Increment Examples

a++, a=a+1, a=a+2

Decrement Examples

a--, a=a-1, a=a-2

Increment and decrement statements can be also classify in two sub categories.
Pre increment (Example: ++a)
Post increment (Example: a++)

An example of pre and post increment 

int a=10

printf(“%d”,a++);

printf(“%d”,++a);

a=a+2;

printf(“%d,a);

- - - OUTPUT - - -

10

12

14