Instructor : Muhammad Haris

All Rights Reserved to Department of Computer Science – GCU Lahore

Programming Fundamentals

Consider this Example

Determine status of a Student from marks of two of his subjects and his GPAIf either the marks for both of the subjects

are greater than 40 or GPA is greater than 2, he’s considered passed

Programming Fundamentals | Lecture-5 2

Programming Fundamentals | Lecture-5 3

START

READ m1, m2, GPA

DISPLAY “Passed”

STOP

(m1 > 40 AND m2 > 40) OR GPA > 2

YesNo

DISPLAY “Failed”

Another Example

Determine whether a student has got Grade A from his total marks and his GPAIf marks are greater than 80 and less than

90 OR GPA is greater than 3.7 and less 3.8, he will be graded as “A”

Programming Fundamentals | Lecture-5 4

Programming Fundamentals | Lecture-5 5

START

READ tm, GPA

DISPLAY “A”

STOP

(tm > 80 AND tm < 90) OR

(GPA > 3.7 AND GPA < 3.8)

YesNo

DISPLAY “Other than A”

Try this Yourself

Determine whether a car is of mid-size type or not from its price (in millions) and engine capacity (in cc)If price is between 1 million and 2 million or

if engine capacity is between 1000 and 1500, a car is considered to be a mid-size car

Programming Fundamentals | Lecture-5 6

Programming Fundamentals | Lecture-5 7

Decision Box Yes No

> > <=

< < >=

== == !=

!= != ==

<= <= >

>= >= <

Operator Opposite

> <=

< >=

== !=

!= ==

<= >

>= <

Decision leading to Decisions In real-world problems, it frequently

happens that result of a decision leads to further decision making

This way computer programs prove to be much more useful

Programming Fundamentals | Lecture-5 8

Consider this Example

For two numbers, do the followingIf second number is greater than 0

○ Divide themIf second number is less than 0

○ Multiply themIf second number is equal to 0

○ Add them

Programming Fundamentals | Lecture-5 9

Programming Fundamentals | Lecture-5 10

START

READ num1, num2

DISPLAY ans

STOP

ans = num1 / num2

num2 > 0YesNo

num2 < 0

ans = num1 * num2ans = num1 +num2

<= >

Yes<

No==

Another Example

For given roll number of a student, display his nameAssume that there are only three students

(first three roll numbers of your section)

Programming Fundamentals | Lecture-5 11

Programming Fundamentals | Lecture-5 12

START

READ rollNo

DISPLAY “Ali”

STOP

rollNo == 2YesNo

!= ==

Yes<No

rollNo == 4

rollNo == 8

DISPLAY “Rehman”

DISPLAY “Hassan”

DISPLAY “No Such Student”

YesNo

Try this Yourself

For given day number of the week, display the corresponding day

Programming Fundamentals | Lecture-5 13

Day Number Week Day

1 Monday

2 Tuesday

3 Wednesday

4 Thursday

Tasks (to be done by next lecture) Display the name of a city against given

city codeDesign your solution for 4-5 cities only

Calculate base pay from given annual salary and pay typeBase pay = salary / Dividing Factor

Programming Fundamentals | Lecture-5 14

Pay type Description Dividing Factor

1 Weekly 52

2 Bi-monthly 24

3 Monthly 12

Programming Fundamentals | Lecture-5 15

BE PREPAREDFOR QUIZ

INNEXT LECTURE