Page 267 - Computer Science V2.0 Class 11

Consider the following sequence of statements in a program:

marks = 40 # Statement1
print(marks) # Statement2
print("Thank You") # Statement3
In the example given above, Statement1 will be executed, followed by Statement2 and then Statement3. Therefore,
the output produced on the execution of the above code will be:
40
Thank You
The flow of control in the above example may be depicted using Fig. 10.1.

Statement 1

Statement 2

Statement 3

Fig 10.1: Sequential Flow of Control

10.1.2 Conditional Flow
Suppose the pass percentage (Maximum Marks is 100) for an examination is 30. So, a student passes the examination
if he/she gets marks above the pass percentage and fails otherwise. Hence, the output will depend on the marks
obtained by a student. We can display the result of a student who secured 44 marks in this examination as follows:
marks = 44
passPercentage = 30
if marks >= passPercentage:
print("Passed")
else:
print("Failed")
In case of conditional flow, the execution of the statements depends upon a conditional expression. If evaluation of the
conditional expression yields True, a particular sequence of statements is executed, otherwise, another sequence
of statements may be executed. Such statements in a program are known as conditional, selection, or branching
statements.

False
Test Statement(s) to be executed if
Condition condition is False

True

Statement(s) to be executed if End of if statement
condition is True

Fig 10.2: Conditional flow of Control

Conditional Statements 253