Looping in programming involves repeatedly executing a block of code until a certain condition is met. There are three main types of loops in C: for, while, and do-while. For and while loops check the loop condition at the beginning of each iteration, while do-while checks at the end. Loops are useful for tasks like printing something many times without copying/pasting code. Looping can also be nested, with one loop placed inside another, to create more complex programs.

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Gandhinagar Institute Of Technology
Subject: CPU (2110003)
Looping Statements, Nesting of Loop Statements
Prepared by: Tarj Mehta
Enrollment No: 201707000179
Guided by- Mrs.Hetal Shah

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What is Looping?
●
Repeating the same path again and again is called
looping.
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The same path is repeated till the desired output is
obtained.
●
A simple life problem of looping can be understood by
example of searching the name from telephone directory
and repeating the process letter by letter till the desired
name is obtained.

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What is Looping in C?
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In C programming, looping is a sequence of instructions
that is continuously repeated until a certain condition is
reached.
●
The programming is done is such a way that certain
conditions are checked.
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If the conditions are satisfied, then only output is
obtained.

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Why is looping used?
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If we want to print ‘HI’ 100 times it is not a willing work to
implement ‘printf’ command 100 times.
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There are more chances to make mistake.
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If any error is found, it is very boring job to search for it
in 100 printf commands executed.
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Thus to save time and mistake looping is used.

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Types of Loop Statements in C
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Loop provides a way to repeat command and control
how many times it is repeated.
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Types of loop:
1. For
2. While
3. Do...while

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For Loop
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Syntax
●
for(initialization;condition;inc
r/decr)
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Flowchart
●

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For Loop
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For loop is called entry control
loop as it checks the condition
while entering the loop.
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The loop is repeated till the
given condition is satisfied,
once the condition is not
satisfied the loop is terminated
and program comes to next
statement.

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While loop
●
Syntax
●
while(condition)
{
execute statements//
}
●
Flowchart
●

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While Loop
●
While loop is also called
entry control loop as it
checks the condition during
entering the loop.
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Once the condition is
satisfied, loop is executed
and the printf statement in it
is executed and incr/decr is
done for next condition
checking.

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Do.....while Loop
●
Syntax
●
do
{
execute statement//
} while(condition)
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Flowchart
●

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Do.....while Loop
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Do...while loop is also
known as exit control loop
as the condition is
checked during exit of
loop.
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In false condition also the
output statement is
printed atleast once.

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Nesting of Loop Statements
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Loop within a loop is called Nested loop and this action
is called Nesting of loop statements.
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One loop is kept inside the body of first loop.
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Number of nested loops are also possible.

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Nesting of loops
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Syntax
●
loop1
{
loop2
{
execute statements//
}
}
●
Flowchart
●

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Example of Nested loop
●
The nesting of loop is
executed when condition
of first loop is true.
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The outer loop takes
control of number of
complete repetitions of
inner loop.
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The most common nested
loop is ‘for’ loop.

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Conclusion
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Looping saves time.
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It is easy to execute.
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It decreases the possibilities of mistakes while
programming.
●
Nesting of loop allows us to write more complex
programs.

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The End
Thank you