C Foundation

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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

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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

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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


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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

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

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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 for loop

what is for loop?

Conceptually, for loop is a bit more complex than while loop and do while loop, though syntax is neat and compact way to write certain types of loops. Typically, a programmer need to use a for loop when you exactly know how many times you want a block of statement to be executed repeatedly.

Syntax for loop

Let us see how neat a syntax of for loop is

for (initializeCounter; testCondition; ++ or -- )

for loop FlowChart

C for Loop

for loop Realtime


Program for loop

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

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


The variable a is initialized to 1 for the first time when the program execution starts in. The condition a <= 5 is a test condition, which is tested for every iteration. The statements under a loop will be executed repeatedly until the test condition is true.

Infinite for loop

When the for statement contains no test condition between the ;(semicolon) then the loop is said to be an infinite for loop.

Program Infinite for loop

The following C program will clearly demonstrate infinite for loop

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


for(;;) statement allows execution of a loop continued for infinite times.

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