C Tutorial

C Tutorial C Language Environment Setup Execution flow of C program C printf and Scanf C Data type C Token Variable in C Operators in C Comments in C Escape Sequence in C C – Storage Classes C Decision control statement Loop Statement in C Break, continue and goto statement in C Type Casting in C Function in C Recursion in C String in C C Array Pointer in C Dynamic memory allocation C –Structure Nested Structure in C Union in C File Handling in C C pre-processor Static Function In C Sizeof In C Selection Sort In C Scope Of Variables In C Runtime Vs Compile Time In C Random Access Lseek In C Queue Implementation In C Pseudo Code In C Prototype In C Pointer To Pointer In C Pointer Arithmetic In C Passing Array To Function In C Null Character In C Merge Sort In C Macros In C Library Functions In C Memory Leak In C Int In C Goto And Labels In C Fibonacci Series In C Fflush In C Derived Data Types In C Data Types In C Const Vs Volatile In C Character Set In C Character Class Tests In C Calloc In C C Pointers Arrays In C Include In C Clrscr In C C Vs Java String Literals In C Types Of Pointers In C Variables In C Volatile In C Why C Is A Middle Level Language Infix To Postfix Program In C Ceil function in C LCM of two numbers in C Quick sort in C Static in C function pointer as argument in C Top Array Keywords in C Add two numbers using the function in C Armstrong program in C using function Array, Declaring Arrays and Array Initialization Limitations of Inline Function in C Merge and Merge sort with example in C Do-While Loop in C For Loop in C While-Loop in C Difference between while and do-while loop in C Array Of Structures in C Data Structures And Algorithms in C Types Of Structures In C How to Avoid Structure Padding in C Use of Structure in C Do WHILE LOOP in C Programming Examples For Loop in C Programming Examples Entry Control Loop in C Exit control loop in C Infinite loop in C Nested loop in C pow() function in C String Handling functions in C Prime Number code in C Factorial Program in C using For Loop Factorial Program in C Using While Loop Fibonacci Series in C Using For Loop Fibonacci series in C using while loop Prime Number Program in C using for Loop While Loop in C programming examples Built-in functions in C Assert() Function C vs Java Strings Call Back Function in Embedded C Else If Ladder fgets() function Ftell() Function getc() function getch() function gets() function Heap Sort Nested if-else statement Pi() Function Positioning of file Write() function abs() function in C Attributes in C C program to find factorial of a number using Recursion Ferror() in c fopen() function in C Fibonacci series program in C using Recursion Formatted Input and output function in C Snake Game in C User Defined Functions in C Beep() function in C Cbrt() function in C Hook() function in C Isalnum() function in C C Program to find the Roots of a Quadratic Equation C Switch Statements Difference between rand() and srand() function in C Difference between while and for loop in C Doubly Linked list in C Example of Iteration in C How to use atoi() function in C How to use floor() function in C How to use sine() function in C How to use Typedef Struct in C Integer Promotions in C C Program Swap Numbers in cyclic order Using Call by Reference C Program to Find Largest Number Using Dynamic Memory Allocation C Program to Find the Largest Number using Ternary Operator C/C++ Program to Find the Size of int, float, double and char Find the Largest Three Distinct Elements in an Array using C/C++ Loop Questions in C Modulus on Negative Numbers in C Multiplication table program in C using For loop Nested Loops in C Programming Examples C Program for Mean and Median of an Unsorted Array Results of Comparison Operations in C and C++ Reverse a Stack using Recursion in C Simple hash() function in C strcat() Function in C Sum of N numbers in C using For loop Use of free() function in C Write a program that produces different results in C and C++ C Function Argument and Return Values Keywords in C Bank management system in C Calendar application in C Floor() Function in C Free() Function in C How to delete a file in C How to move a text in C Remove an element from an array in C Unformatted input() and output() function in C What are linker and loader in C fork() in C GCD program in C Branching Statements in C Comma Operator in C Control statement in C Double Specifier in C How to create a binary file in C Long int in C Palindrome Number in C Pure Virtual Function in C Run Time Polymorphism in C Types of Array in C Types of Function in C What is a buffer in C What is required in each C Program Associativity of Operators in C Bit Stuffing Program in C Actual and Formal Parameters Addition of two Numbers in C Advantages of function in C Arithmetic Progression Program in C Binomial Coefficient Program in C Difference between Array and List in C Diffie-Hellman Algorithm in C How to convert a number to words in C How to convert a string to hexadecimal in C Difference between If and Switch Statement in C

Example of Iteration in C

The iterations in the C language are the statements which are executed number of times until a certain condition is reached. These iterations are regarded as “Loops” in C language. The Iterations can be able to modify the control flow of the program thus they referred as “Control Statements.”

Loops:

The Continuous repetition of statements until a condition is satisfies are called loops.

The loops consist of initialization, condition and updating. In initialization, a variable is declared a variable with a value. In Condition, a specific condition is provided so that the repetition of the code is controlled to specific number of times. In Updating, the value which is initialized earlier is being increased/ decreased according to the condition.

The Loops are classified into two types:

  1. Pre-test Loop.
  2. Post-Test Loop.

Pre-Test Loop:

In the Pre-Test Loop, the checking of the condition whether its true or false is done at the start of loop and then enters the loop body.

The Pre-Test Loops are:

While Loop:

In while loop, the condition is checked first and allows the flow of execution into the loop body if the condition is true. The Initialization of the variable in while loop id done before creating a loop body. The Condition is mentioned after the “while” keyword in the Parenthesis i.e., (). The Updating is done inside Loop block.

Syntax:

while(condition)


{
	//Loop statements and Updating(Increasing/ Decreasing)
}

Example:

//Program for while loop
#include<stdio.h>
#include<conio.h>
void main (void)
{
	int n=3 , i=0; // initialization
	while(i<n) //conditon
	{
		printf(“Loop Executed successfully\n”);
		i=i+1; // Updating
}


}

Output:

Loop Executed Successfully
Loop Executed Successfully
Loop Executed Successfully

For Loop:

The For loop is ideal among all the loops as, the initialization, condition and updating can be done in a single line.

Syntax:

for(initialization; condition ; updating )
{
	// statements
}

Example:

// Program for “for Loop”
#include<stdio.h>
#include<conio.h>
void main (void)
{
	int i, n =3;
	for(i=0;i<n;i++)
	{
		printf(“For Loop Successfully Executed\n”);
}
}

Output:

For Loop Successfully Executed
For Loop Successfully Executed
For Loop Successfully Executed

Post-Test Loop:

In the post test loop, the loop condition is checked after execution of block of code.

The Pre-test loops are:

Do While Loop:

The Do-while loop is same as while loop but the block of code is executed at least once before checking the loop condition. The initialization is done outside the loop body. The condition is written after the block of code. The Increment/ Decrement (updating) is done inside the block.

Syntax:

do
{
//statements
} while(Condition);

Example:

// Program for do-while loop
#include<stdio.h>
#include<conio.h>
void main (void)
{
	int i , n=3; // initialization 
	do
	{
		printf(“do-while loop successfully executed\n”);
		i++; // updation
}  while(i<3); // conditon
}

Output:

do-while loop successfully executed
do-while loop successfully executed
do-while loop successfully executed

Summary:

The iterations in c language are the statements which are executed multiple number of times until a condition is reached which is referred as loops. These loops are of two types of Pre-test and Post-test loops. The Pre-test loops are “For Loop” and “While Loop”. The Post-Test Loops are “Do-while Loop”.



ADVERTISEMENT
ADVERTISEMENT