C Foundation

What is C? C Compiler Installation C Extensions C Compiler C Interpreter C Program Structure

C Basics

C Keywords C Data Types C Identifiers C Variables C Constant C Escape Sequences C Constant and Volatile C Typecast


What is Operator C Comma Operator C Arithmetic Operators C Relational Operators C Logical Operators C Bitwise Operators C Conditional Operators C : : Operator C Operator Priority

Basic IO's

Basic IO's C Formatted Functions C Unformatted Functions C Common Functions

Control Statements

What is Control Statement C if Statement C if else Statement C Nested if Statement C Else if Statement C Break Statement C Continue Statement C Switch Statement C Goto Statement


What is Control Loop C for Loop C Nested for Loop C while Loop C Nested while Loop C do while Loop C Nested do while loop


What is Function C User Defined Functions C Recursion C Passing Parameters


Scope C Local Scope C Global Scope

Storage Classes

What is Storage Class C Auto C Extern C Static C Register


What is Array C One Dimensional Array C Two Dimensional Array C Multi Dimensional Array C Arrays Of Strings


What is String C String Functions


What is Pointer C Pointers Arithmetic C Pointer to Pointer C Pointers and Arrays C Pointers and Strings C Pointer to Functions Void Pointers Null Pointers C Null and Void Pointer


What is Structure C Struct within Struct C Array within Structure C Pointer to Structure C Structure and Function C Enum C Bitfield Structure C Type def


What is Union


What is File C read a file C write a file C File Handling C Error Handling C Low Level Disk I/O C Other file functions

Memory Allocation

What is Memory Allocation C Malloc() C Calloc() C Free() C Realloc() C Coreleft()

C Reference

All ASCII Code Basic C Questions

C Interview

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The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

C while loop

The while loop, otherwise said to be a splitted for loop. Any program which are written using for loop can be written using while loop. Here, a block followed by the while loop will be executed repeatedly until the test condition is true.

while loop Syntax

Let us see how neat a syntax of while loop is

while(test condition)
Body of the loop

while loop Flowchart

C for Loop

while loop Realtime


C program - while loop

The following example program will clearly explain the concept of while loop

#include <stdio.h>
int main()
int a = 1;
while(a <= 5)
printf("%d ", a);
return 0;
  • 1 2 3 4 5


A variable a is initialized to 1 at the time of initializing a variable. The condition a = 5 is the test condition, which is tested for every iteration. A block followed by a while loop will be executed repeatedly until the test condition is true. a++ is used to increment the value of a every time after printing the value of a.

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