CT3/P3

Question 1

What are the types of programming constructs?

Answer 1

Sequence
Selection
Iteration

Question 2

What is the function of a sequence programming construct?

Answer 2

It is used for the execution of statements or functions one after the other.

Question 3

What is the function of a selection programming construct?

Answer 3

Selection is used to execute only a particular set of statements if a condition is satisfied.

Question 4

What is the function of an iteration programming construct?

Answer 4

Iteration is used to execute a particular set of statements repeatedly until a condition is satisfied.

Question 5

In what ways can iteration statements be created?

Answer 5

By counting how many times the statements are to be executed
By repeatedly executing the statements until a condition is true
By repeatedly executing the statements while a condition is true

Question 6

What structure is used to count the number of times a statement is to be executed?

Answer 6

“for” structure

Question 7

What structure is used to execute statements until a condition is met ?

Answer 7

“Repeat until” or “Do while” loop

Question 8

What structure is used to execute statements while a condition is met?

Answer 8

“While” loop

Question 9

What iteration structures are available in Python?

Answer 9

‘for’ loop and while loop

Question 10

What type of programming construct is used to print a multiplication table?

Answer 10

Iteration. For loop

Question 11

What is the syntax for checking multiple conditions in Python?

Answer 11

if expression1:
statement(s)
elif expression2:
statements(s)
…
else:
statement(s)

Question 12

What is the syntax for ‘for’ loop in Python?

Answer 12

for num in range( , ):
statement(s)

Question 13

What is the syntax for while loop in Python?

Answer 13

while (condition):
statement(s)

Question 14

What is a break statement used for?

Answer 14

Break statement in Python terminates the current loop and resumes operation from the next statement.

Question 15

What are variables?

Answer 15

Variables are labels that are used to represent values stored in computer memory, whose values can be changed during the execution of a program.

Question 16

What are Constants?

Answer 16

Constants are labels that are used to represent values stored in computer memory that remain unchanged during the execution of a program.

Question 17

Why is declaration of variables important in programming?

Answer 17

Declaration of variables in a program is important because the correct amount of space in memory is allocated by the compiler.

Question 18

Why is it important to initialise a variable or constant?

Answer 18

It is important to initialise a variable or constant to avoid usage of previously stored values in a location. Not initialising a variable may result in wrong answers.

Question 19

How are values assigned to variables in Python?

Answer 19

In Python programming language, the variables are assigned when the first data is entered to it. The variables are typecast by using commands such as float, int or str to make them a floating-point, integer or string value.

Question 20

State an example for a typecasting statement.

Answer 20

length = int(input(‘Enter the length: ‘))

Question 21

What is the difference between integers and real numbers?

Answer 21

Integers are positive or negative whole numbers. Whereas positive or negative numbers that allow decimals and fractions are called real numbers.

Question 22

What is the output for the following program?
int_num = int(62) float_num=float(62) print(“integer num= “,int_num)
print(“float num= “,float_num)

Answer 22

integer num=62
float num=62.0