8.1 Programming Concepts Cambridge IGCSE 0478

What is a variable in programming?

• A named storage location in memory that can hold different values during program execution.

• A fixed value that never changes.

• A part of the CPU used for calculations.

• A special type of loop structure.

Which of the following best describes a constant in programming?

• A value that does not change during program execution.

• A variable that can be updated any time.

• A data type that stores only integers.

• A temporary storage location.

In Python, which keyword is commonly used to declare a constant (by convention)?

• Writing the variable name in uppercase (e.g., PI = 3.14).

• Using the const keyword.

• Using let before the variable name.

• Using fixed before the variable name.

Which of the following is the correct way to declare a variable in Python?

• age = 25

• int age = 25;

• let age = 25;

• constant age = 25;

What is the main difference between a variable and a constant?

• A variable can change its value during execution, while a constant remains the same.

• A variable stores numbers, while a constant stores text.

• A constant is always declared before variables.

• A constant is a special type of loop structure.

In a strongly typed programming language like Java, how would you declare a constant?

• final int MAX_SCORE = 100;

• int MAX_SCORE = 100;

• constant int MAX_SCORE = 100;

• let MAX_SCORE = 100;

Which of the following correctly assigns a value to a variable in Python?

• temperature = 37.5

• temperature == 37.5

• temperature := 37.5

• set temperature to 37.5

What happens if you try to change the value of a constant during execution?

• The program will generate an error.

• The constant will be updated successfully.

• The program will ignore the change and continue.

• The compiler will automatically convert it into a variable.

Why is it important to use constants in programming?

• To improve code readability and prevent accidental modification of important values.

• To allow values to change frequently.

• To reduce execution time significantly.

• To store random data values.

In pseudocode, how would you declare a constant?

• CONSTANT PI ← 3.14

• VAR PI ← 3.14