Lecture No 12 Loop Logic Structure Overview Learning

Lecture No. 12 Loop Logic Structure

Overview • • • Learning Objectives Learning Outcomes Loop Logic Structures Example Summary

Learning Objectives • To explain loop logic structures • To apply loop logic structures

Learning Outcomes • The Students are able to: • Explain loop logic structures • Apply loop logic structures

Overview of Sequential Logic Structure

Overview of Decision Logic Structure

Introduction to Loop Logic Structure

While/While. End Pretest Looping (While Loop) 0 -8

Flowchart Diagram of While/While. End 0 -9

Python Syntax: While Loop • Python Syntax: while condition : repeated statements 0 -10

Example 1 • Print n times “Hello” using while loop Algorithm: 1) Start 2) Input n 3) i=1 4) while i<=n print “Hello” i=i+1 while end 4) Stop 0 -11

Example 1 • Python Code: n=input(‘Enter N: ’) i=1 while i<=n: --->print “Hello” --->i=i+1 Start input n i=1 While i<=n T print “Hello” i=i+1 Stop 0 -12 F

Example 2 • Print 1 to n numbers using while loop Algorithm: 1) Start 2) Input n 3) i=1 4) while i<=n print i i=i+1 while end 4) Stop 0 -13

Example 2 • Python Code: n = input (‘Enter N: ’) i=1 while i<=n: --->print i --->i=i+1 Start input n i=1 While i<=n T print i i=i+1 Stop 0 -14 F

Example 3 • Print 1 to n and find sum of all numbers using while loop Algorithm: 1) Start 2) Input n 3) i=1, sum=0 4) while i<=n print I sum = sum+i i=i+1 while end 5) print “Sum: ”, sum 6) Stop 0 -15

Example 3 • Python Code: n=input(‘Enter N: ’) i=1 sum=0 while i<=n: --->print i --->sum=sum+i --->i=i+1 print “Sum: ”, sum 0 -16 Start input n i=1, sum=0 While i<=n T print i sum=sum+i i=i+1 print sum Stop F

Example 4 • Print all even numbers and find sum of all even numbers from 1 to n using while loop Algorithm: 1)Start 2)Input n 3) i=1, sum=0 4) while i<=n if n%i ==0 then print i sum = sum+i end if i=i+1 while end 5) print “Sum: ”, sum 0 -17 6) Stop

Example 4 • Python Code: n=input(‘Enter N: ’) i=1 sum=0 while i<=n: --->if n%i ==0 then --->print i --->sum=sum+i --->i=i+1 print “Sum: ”, sum Start Input n i=1, sum=0 While i<=n i=i+1 T if n%i then print i sum=sum+i Print sum 0 -18 Stop F

Example 5 • Print reverse number of given number using while loop Algorithm: 1)Start 2) Read n 3) rev=0 3) while n>0 d=n%10 rev=rev+d n=n/10 while end 4) print “Reverse Number: ”, rev 5) Stop 0 -19

Example 5 • Python Code: n=input(“Enter N: ”) sum=0 while n>0: --->d=n%10 --->rev=rev*10+d --->n=n/10 print “Reverse: ”, rev 0 -20 Start Read n rev=0 While n>0 T d=n%10 rev=rev+d n=n/10 Print “Reverse: ”, rev Stop F

Example 6 Find average of the given ages Python Code: n=input(“Enter n: ”) i=1 sum=0 while(i<=n): ---->age=input(“Enter Age: ”) ---->sum=sum+age ---->i=i+1 avg=sum/n print “Average: ”, avg 0 -21

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Example • • Print 1 to n and its square using while loopc Check number is perfect square Check number is prime or not Check number is divisible by 3 Check number is divisible by 5 Find factorial of a given number Find Fibonacci series Find Multiplication Table 0 -23

Summary • Introduction of Loop Logic Structures • Use of Loop Logic Structures using while loop

Important Questions Loop Logic Structure • Explain pretest condition loop logic structures with proper example.