loop in c

Loops in c programming language, repeats statement, for a given number of times until given condition is satisfied.

c language has 2 types of loops

1. Entry control loop
2. Exit control loop

Entry control loop

Loops in which condition gets checked first, before executing the statements. Entry control loop are of two types

1. for
2. while

for loop

for loop is an entry control loop, which repeat statements until test condition become false.

Syntax

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

initialization	The initial value from where the loop starts with.
condition	It specifies the number of times loop will repeat itself.
iteration	It either increases or decreases the loop cycle to continue.

while loop

while loop is also an entry control loop, similar to for loop, but initialization is done outside loop and iteration is done inside loop body.

Syntax

initialization;
while(expression)
{
	// statements
	// iteration
}

Example

#include<stdio.h>
int i = 0;
while (i < 10)
{
	printf("%d ", i);
	i = i + 1;
}

Exit control loop

Loop in which statements executes first & test condition is checked later.

do-while loop

do while is an exit control loop, which executes statements first then check the test condition.

Syntax

do{
   // statements
}while(expression)