1. Chapter 4: Control Structures
Selection Statement
Selection Structure

2. Control Structures

3. Selection Structures One way selection (single if)
Two way selection (if…else)
Multiple Selection (Nested if…else)

4. One-Way Selection

5. If G more than or equal to 60 End
Write a program that read the grade of the student and if it is more than or equal 60; print “Pass”
Start
Start
Read the grade G
If G more than or equal to 60
Print “Pass”
End
Read G If
G >= 60
False
True
Print “pass”
End

6. Write a program that divide one integer by another only if the divisor not equal to 0.
Start
Read first number (dividend )
Read second number (divisor)
If divisor not equal 0
Result = dividend / divisor
Print Result
End
Start
Read D1
Read D2 If
D2 != 0
True
False
Result= D1 / D2
Print Result
End

7. Two-Way Selection

8. Write an algorithm to read two numbers and print the largest one
Start
Read first number (num1)
Read second number (num2)
If num1 is larger than num2
Print num1
else
Print num2
Start
Read num1
Read num2 If
num1 > num2
False
True
Print num1
Print num2
End

9. Write a program that read a temperature and if it is more than 35 print “Summer”, otherwise print “winter”
Start
Read D
If D>35
Print “Summer”
Else
Print “winter”
End

10. Start Read g1,g2,g3 Average = (g1+g2+g3)/3 If Average >= 60 Else
Write a program that read 3 grades for a student and find the average. If the average more than or equal 60; print “pass”, otherwise print “fail”
Start
Read g1,g2,g3
Start
Read g1,g2,g3
Average = (g1+g2+g3)/3
If Average >= 60
Print “pass”
Else
Print “fail”
End
Avg = (g1+g2+g3)/3 If
avg >= 60
False
True
Print “Pass”
Print “Fail”
End

11. Multiple Selection: Nested if

12. Start Read a number (N) If N greater than 0 Else if N less than 0 Else
Write a program that read a number then print a message saying whether the number is positive, negative or zero.
Start
Start
Read a number (N)
If N greater than 0
Print “Positive”
Else if N less than 0
Print “Negative”
Else
Print “Zero”
Read N If
N > 0 T
Print “Positive” F If
N < 0 T F
Print “Negative”
Print “Zero”
End

13. Bad Solution!! Start Read N T If N > 0 F Print “Positive”
Why check again ?!! If
N < 0 T F
Print “Negative”
Print “Zero”

14. If students grade is greater than or equal to 90 Display ‘A’
write a pseudocode / algorithm to work out what grade a student got based on the following information :- if student (above or equal) to 90 -> A , 80 –> B, 70 –> C, 60 –> D, less then or equal 60 –> F
Start
Read grade
If students grade is greater than or equal to 90
Display ‘A’
Else If students grade is greater than or equal to 80
Display ‘B’
Else If students grade is greater than or equal to 70
Display ‘C’
Else If students grade is greater than or equal to 60
Display ‘D’
Else
Display ‘F’
End

15. Start
Read G If
G >= 90 T F
Print “A” If
G >= 80 T F If
G >= 70 F T
Print “B” If
G >= 60 T F
Print “C”
Print “D”
Print “F”
End