Loop In C Programming Language

Loop In C Programming Language

Introduction

In this post, we will learn about loops in c programming language. In C programming language, loops are used to execute a set of statements repeatedly until a particular condition is satisfied.
Remember in our very first we wrote a program to print "Hello, World". Now suppose we want to repeat this for 1000 times, means we want to print Hello, World 1000 in a program. It is not practically possible to repeat printf("Hello, World"); 1000 times and because here statement print "Hello, World" is repeatable we can use a loop.

Types of Loop in C programming language

There are three types of loop in C programming language.

• For Loop
• While Loop
• Do While Loop

For Loop in C

These are the steps that we follow while using for loop in c

1. It first evaluates the initialization code.
2. Then it checks the condition expression.
3. If it is true, it executes the for-loop body.
4. Then it evaluates the increment/decrement condition and again follows from step 2.
5. When the condition expression becomes false, it exits the loop.

Example: Print "Hello, World" 1000 times using for loop.

 #include<stdio.h>  
 void main( )  
 {  
   int i;  
   for(x = 0; i < 1000; i++)  
   {  
     printf("Hello, World\n");  
   }  
 }  

While loop in C

while loop can be addressed as an entry control loop. It is completed in 3 step

1. Variable initialization.(e.g int i = 0;)
2. Condition(e.g while(i <= 10))
3. Variable increment or decrement ( i++ or i-- or i = i + 2 )

Example: Print "Hello, World" 1000 times using While loop.

 #include<stdio.h>  
 int main()  
 {  
     int i = 0;  
      while(i<1000) {  
           printf("Hello, World\n");  
         i = i + 1;  
      }       
 }  

Do While loop in C

In some situations, it is necessary to execute the body of the loop before testing the condition. Such situations can be handled with the help of do-while loop.

1. Variable initialization
2. Execute body
3. check the condition

Example: Print "Hello, World" 1000 times using do While loop.

 #include <stdio.h>  
 void main( )  
 {  
   int i = 0;  
   do {  
           printf("Hello, World\n");  
           x = i + 1;  
      }while(i<1000)  
 }  

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