Lecture on Loop while loop for loop + program

Topic Covered: Introduction to Loops
, while loop+ programs, For loop + do
while loop +programs, Programming
practice using loops.
LECTURE: 8

Life is all about Repetition.
We do same thing everyday

Introduction of loop
Loop is used to execute the block of code several times according to the condition
given in the loop. It means it executes the same code multiple times.
In programming, loops are used to repeat a block of code until a specified condition
is met.
Output:
Hello
Hello
Hello
Hello
Hello
loop(condition)
{
//statements
}

Types of
loop
C programming has three types of loops.
for loop
while loop
do...while loop

While Loop
•while is an entry control loop.
•Statements inside the body of while are
repeatedly executed till the condition is true.
•while is keyword.
•The syntax of the while loop is:
while (testExpression) {
// the body of the loop
}

How while loop works?
The while loop evaluates the test Expression inside
the parentheses ().
If test_Expression is true, statements inside the
body of while loop are executed.
Then, test_Expression is evaluated again.
The process goes on until test Expression is
evaluated to false.
If test_Expression is false, the loop terminates
(ends).

Write A Program to print 1 to n
using While loop?

Write A Program to print Odd numbers
between 1 to n using while loop.

WAP to print multiplication table
using while loop.

WAP to Sum of 5 numbers entered
by user using while loop.

WAP to find factors of a
number using while loop.

WAP to print reverse a number
while loop.

for loop
for is an entry control loop.
Statements inside the body of for are
repeatedly executed till the condition is true
for is keyword.
The syntax of the for loop is:
for (initialization; condition; updateStatement)
{
// statements
}

How for loop works?
The initialization statement is executed only once.
Then, the test expression is evaluated. If the test
expression is evaluated to false, the for loop is
terminated.
However, if the test expression is evaluated to true,
statements inside the body of the for loop are executed,
and the update expression is updated.
Again the test expression is evaluated.
This process goes on until the test expression is false.
When the test expression is false, the loop terminates.

WAP to print numbers 1 to n using
for loop.

do while loop
•do while is an exit control loop.
•Statements inside the body of do while are repeatedly executed till
the condition is true.
•Do and while are keywords.
The do.. while loop is similar to the while loop with one
important difference. The body of do...while loop is executed
at least once. Only then, the test expression is evaluated.
The syntax of the do...while loop is:
do {
// the body of the loop
}
while (test_Expression);

How do...while loop
works?
•The body of do...while loop is executed once.
Only then, the test_Expression is evaluated.
•If test_Expression is true, the body of the
loop is executed
again and test_Expression is evaluated once
more.
•This process goes on
until test_Expression becomes false.
•If test_Expression is false, the loop ends.

WAP to print Odd numbers between
1 to n using do while loop.

WAP to find factors of a number
using do while loop.

Lecture on Loop while loop for loop + program

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