The Loops

• In computer programming, a loop is a
sequence of instructions that is continually
repeated until a certain condition is reached.
• Programming languages provide various
control structures that allow for more
complicated execution paths.
• Loop control statements change execution
from its normal sequence. When execution
leaves a scope, all automatic objects that were
created in that scope are destroyed.

• A loop statement allows us to execute a
statement or group of statements multiple
times and following is the general form of a
loop statement in most of the programming
languages.

DIFFERENT TYPES OF
LOOP
Loop Type Description
While loop Repeats a statement or group of statements
while a given condition is true. It tests the
condition before executing the loop body.
For loop Execute a sequence of statements multiple
times and abbreviates the code that
manages the loop variable.
Do……While loop Like a while statement, except that it tests
the condition at the end of the loop body
Nested loop You can use one or more loop inside any
another while, for or do..while loop.

FOR LOOP
 SYNTAX :
 The syntax of a for loop in C programming
language is:
 In computer science a for loop is a programming
language statement which allows code to be
repeatedly executed.

 Ex.1. A program to store 10 real nos.
using for loop.

SYNTAX:
 The syntax of a while loop in C programming
language is:
 A while loop statement in C programming
language repeatedly executes a target statement
as long as a given condition is true.

 Ex.2. A PROGRAM USING WHILE
LOOP.

DO…..WHILE loop
 Unlike for and while loops, which test the loop
condition at the top of the loop,
the do...while loop in C programming
language checks its condition at the bottom of
the loop.
 A do...while loop is similar to a while loop,
except that a do...while loop is guaranteed to
execute at least one time.

 Ex.3. A program using DO…WHILE loop
with its OUTPUT.

Nested loops
The syntax for a nested for loop statement in
C is as follows:

 The syntax for nested while and do….while
loop:
do
{
statement(s);
do
{
statement(s);
}
while(condition);
}
while( condition );
while( condition )
{
while( condition )
{
statement(s);
}
statement(s);
}
Nested loops

 Ex.4. A program using nested for
loop.

The Loops

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The Loops