Loops In C programming

In C programs if user want to execute block of code several times here loops are used.in other words loops are used to excecute block of code multiple times until specific condition met.

In C programs we  have 3 types of loops

1. For Loop
2. while Loop
3. Do-while Loop

 

Lets learn more by taking examples for Loops

For Loop

It execute the code until condition is false. it depends on 3 parameters

Syntax

[php]for (Initialization;condition;increment/decrement)

{

//code

}

[/php]

How For loops Works

1. First initialization executed once
2. now condition will executed until its false
3. if condition is true it will increment by 1

Example 

[php]#include<stdio.h>

#include<conio.h>

void main() {

int i;

for( i = 20; i < 25; i++)

{

printf ("%d " , i);

}

getch();}[/php]

while Loop

While loop is executed until condition is false

Synax

[php]while(condition){
//code
}[/php]

Example

 

[php]#include<stdio.h>
#include<conio.h>
void main()
{
int i = 35;
do{
printf ("%d " , i );
i++;
}
while( i < =40 );
getch();
}
[/php]

Output

35
36
37
38
39

Do-while Loop
syntax

[php]do{
//code
}while(condition);
[/php]

Example

[php]
#include<stdio.h>
#include<conio.h>
void main()
{
int i = 10;
do{
printf ("%d " , i );
i++;
}
while( i < =10 );
getch();
}
[/php]

output

10
11