all about looping in c programming....

1. 1
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.
●
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?
●
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.
●
If the conditions are satisfied, then only output is
obtained.

4. 4
Why is looping used?
●
If we want to print ‘HI’ 100 times it is not a willing work to
implement ‘printf’ command 100 times.
●
There are more chances to make mistake.
●
If any error is found, it is very boring job to search for it
in 100 printf commands executed.
●
Thus to save time and mistake looping is used.

5. 5
Types of Loop Statements in C
●
Loop provides a way to repeat command and control
how many times it is repeated.
●
Types of loop:
1. For
2. While
3. Do...while

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

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For Loop
●
For loop is called entry control
loop as it checks the condition
while entering the loop.
●
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.

8. 8
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.
●
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)
●
Flowchart
●

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

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

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Nesting of loops
●
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.
●
The outer loop takes
control of number of
complete repetitions of
inner loop.
●
The most common nested
loop is ‘for’ loop.

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Conclusion
●
Looping saves time.
●
It is easy to execute.
●
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