LOOPS IN C LANGUAGE

Why we use loops in C language or any language ? 

             Look friends to understand the looping concept you need to know the importance of  loop , loops are use to perform any task repeatedly and take decision according to condition set in looping , loops are always a part of a big program . 

Lopping in C

Loops :- Loops generally possess two parts one is body of loop and another is called control statement .Control statement decides the category of loop,there for control statement is classified as entry-control loop or exit-control loop.

Loops generally posses few steps :-

• declaration and initialization of condition variable
• writhing condition statement in loop
• putting increment or changing condition of variable

Loops provided by C language are as follows:-

• While loop
• Do loop
• for loop

While Loop

format of while loop

While (test condition )

{

Body of loop

}

example-

int i=1 sum=0; /* initialization */

While (i<=10 ) /* condition */

{

sum=i+1;

i=i+1; /* increment */

}

Do Loop

format of do loop:-

do

{

     Body of loop

}

While (test condition );

note:- this will execute the loop 1^st time and then from next time will check the condition of while till condition does not goes false .

Example:-

int I;

do

{

   printf(“Enter any number”)

   scanf(“%d”&i);

   printf(“number=%d”,i);

}

While (i>=1);

For Loop:-

for loop provides the best control structure and reduce the code length of a user.

Format of for loop :-

for (initialization;condition; increment)

{

   body of loop;

}

example:-

int I;

for (i=1;i<=5; i++)

{

     printf(“*”);

}

printf(“\n”);

this will print 5 star in a column every star on new line .