While

Good Morning boys

Today we will take a step ahead into the concept of looping, with an introduction of the WHILE loop

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By the end of this session, you will be able to:

• understand the need for while loop
• Understand the syntax of the WHILE loop
• Apply the loop to get the desired result
• Predict the output for a group of statements.

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The Google meet link for the class today is:

Meeting ID

meet.google.com/yye-uwdw-enc

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The WHILE loop discussed so far is primarily used for repetitive statements which are repeated if a given condition is met.

We will first take a recap of the following  example

Example

count = 1  # initialization
while (count < =5):    # Test expression
   print('The number is:', count)
   count = count + 1   #increment

print "Good bye!"

When the above code is executed, 

Initial value of count= 1	Value of count	print('The number is: ', count)	Count=count+1	WILL THE LOOP GET EXECUTED?
	1	The number is: 1	2	Yes
	2	The number is: 2	3	Yes
	3	The number is: 3	4	Yes
	4	The number is: 4	5	Yes
	5	The number is: 5	6	No

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If we change the question and print only the odd numbers from 0-10 then

• Keep in mind- ODD NUMBERS between 0 and 10 are-1,3,5,7,9  
• count will be initialized to 1 , because 1 is the first odd number
• every time the loop executes, the increment will be with value 2
• condition will be tested for count<=10

count = 1 # initialization while (count < =10): # Test expression print('The number is:', count) count = count + 2 #increment print "Good bye!"

Initial value of count= 1	Value of count	print com	Count=count+2	WILL THE LOOP GET EXECUTED?
	1	The number is: 1	3	Yes
	3	The number is: 3	5	Yes
	5	The number is: 5	7	Yes
	7	The number is: 7	9	Yes
	9	The number is: 9	11	No

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If we change the question and print only the EVEN NUMBERS from 0-10 then

• Keep in mind- EVEN NUMBERS between 0 and 10 are-2,46,8,10  
• count will be initialized to 2 , because 2 is the first even number
• every time the loop executes, the increment will be with value 2
• condition will be tested for count<=10

count = 2 # initialization while (count < =10): # Test expression print('The number is:', count) count = count + 2 #increment print "Good bye!"

Initial value  of count= 2	Value of  count	print comm	Count=count+2	WILL THE LOOP  GET EXECUTED?
	2	The number is: 2	4	Yes
	4	The number is: 4	6	Yes
	6	The number is: 6	8	Yes
	8	The number is: 8	10	Yes
	10	The number is:  10	12	No