Programming Modules Quiz

Programming Logic and Design - Chapter 5: Modules

• Modules are groups of statements designed for specific tasks in a program
• Complex programs are effectively broken down into smaller subtasks (divide and conquer)
• This simplification enhances code readability and manageability.

Learning Objectives

• 5.1 Introduction: Overview of modules
• 5.2 Defining and Calling a Module: Defining and invoking modules
• 5.3 Local Variables: Scope and usage of local variables
• 5.4 Passing Arguments to Modules: Passing data between modules
• 5.5 Global Variables and Global Constants: Introduction to global variables/constants
• 5.6 Focus on Languages (Java, Python, C++): Implementation details in various languages

5.1 Introduction (1 of 2)

• A module is a segment of code for accomplishing specific tasks
• Large programs are divided into smaller modules to boost readability, testing, and reusability

5.1 Introduction (2 of 2)

• Using modules improves code clarity
• Modules are reusable and simplify testing.
• Modules facilitate teamwork by dividing tasks

5.2 Defining and Calling a Module (1 of 7)

• Module definition: the code that forms a module

• Example module (showMessage()):

  • Module showMessage()
  • Display "Hello world."
  • End Module

• To run the module: call it as a statement within the program.

  • Call showMessage()

5.2 Defining and Calling a Module (2 of 7)

• Module names should be clearly descriptive
• No spaces or punctuation marks in module names.
• Cannot start with a number

5.2 Defining and Calling a Module (3 of 7)

• Module Definitions consists two parts:
  • Header: starting point of module
  • Body: statements within module

5.2 Defining and Calling a Module (4 of 7)

• To carry out statements within the module, a call has to be made to the module.
• Program execution starts at main module

5.2 Defining and Calling a Module (5 of 7)

• Flowcharting programs with modules illustrates each module separately.
• Modules are depicted in a flow chart separately to improve visualization.

5.2 Defining and Calling a Module (6 of 7)

• Top-down design is a step:by-step approach to create algorithms into modules.
• Subtasks are identified and broken down.
• Subtasks are then converted to coded modules.

5.2 Defining and Calling a Module (7 of 7)

• A hierarchy chart visualizes the relationships between different modules in a program
• Hierarchy charts abstract away program details, focusing on module interactions

5.3 Local Variables (1 of 3)

• Local Variables: declared within a module and not accessible from outside the module.

5.3 Local Variables (2 of 3)

• Variable scope: the part of the program where a variable is accessible.

5.3 Local Variables (3 of 3)

• Duplicate variable names (in same scope): cannot have duplicate local variable names
• Variables in different scopes can have same names (e.g. different modules).

5.4 Passing Arguments to Modules (1 of 3)

• Arguments are data values sent to a module during a call
• Parameters are variables that receive arguments

5.4 Passing Arguments to Modules (2 of 3)

• Argument and parameter data types should be compatible

5.4 Passing Arguments to Modules (3 of 3)

• Multiple arguments can be sequentially passed into a module.
• Passing arguments by value/reference

5.5 Global Variables & Global Constants (1 of 2)

• Global variables are accessible from any module in a program.
• Avoid using global variables for better program structure and modularity. - They can lead to unintended side effects.

5.5 Global Variables & Global Constants (2 of 2)

• Global constants: named constants available to all modules.
• Global constants are preferable over global variables due to immutability.

5.6 Focus on Languages: Java (1 of 9)

• In Java, modules are known as methods
• Method definitions include:
  • Header: specifies method name
  • Body: statements executed when method is called

5.6 Focus on Languages: Java (2 of 9)

• Method calls cause the program to jump to and execute statements within the method's body

5.6 Focus on Languages: Java (3 of 9)

• Local Variables: declared and accessible only within scope of method

5.6 Focus on Languages: Java (4 of 9)

• Passing arguments to methods: use parameter variables in the method header

5.6 Focus on Languages: Java (5 of 9)

• Passing arguments to methods (continued)

5.6 Focus on Languages: Java (6 of 9)

• Passing multiple arguments to Java methods

5.6 Focus on Languages: Java (7 of 9)

• Arguments in Java methods are passed by value

5.6 Focus on Languages: Java (8 of 9)

• Global constants in Java are declared outside method

5.6 Focus on Languages: Java (9 of 9)

• Global constants in Java are accessible to methods within class.

5.6 Focus on Languages: Python (1 of 10)

• Functions in Python are used for modularizing code
• Define functions using the def keyword
• Function definitions consist of: header and body

5.6 Focus on Languages: Python (2 of 10)

• Calls executed by function names.

5.6 Focus on Languages: Python (3 of 10)

• Indentation is crucial in Python for code blocks

5.6 Focus on Languages: Python (4 of 10)

• Local variables are accessible only within functions.

5.6 Focus on Languages: Python (5 of 10)

• Passing arguments to Python functions: parameter variables must match data type

5.6 Focus on Languages: Python (6 of 10)

• Passing multiple arguments to functions

5.6 Focus on Languages: Python (7 of 10)

• Arguments in Python functions are passed by value

5.6 Focus on Languages: Python (8 of 10)

• Global variables defined outside functions

5.6 Focus on Languages: Python (9 of 10)

• Global variables accessed in any function.

5.6 Focus on Languages: Python (10 of 10)

• Python does not support true global constants, global variables can simulate

5.6 Focus on Languages: C++(1 of 8)

• Functions are used for modular code in C++
• Function definitions include a header (specifying the function name) and a body (statements).

5.6 Focus on Languages: C++ (2 of 8)

• Function calls cause program execution to transfer to function; execution continues in that function; then back to main

5.6 Focus on Languages: C++ (3 of 8)

• Local variables are accessible only inside functions

5.6 Focus on Languages: C++ (4 of 8)

• Passing arguments to C++ functions: parameter variables need matching data type.

5.6 Focus on Languages: C++ (5 of 8)

• Passing multiple arguments to functions.

5.6 Focus on Languages: C++ (6 of 8)

• Arguments are passed by value in C++ functions.

5.6 Focus on Languages: C++ (7 of 8)

• Reference variables in C++ enable modification of a variable, the value is directly passed.

5.6 Focus on Languages: C++ (8 of 8)

• Global variables are accessible in any function. Global constants (declared outside functions) are accessible to all functions in a program.

Test your knowledge on modules in programming with this quiz. Covering essential concepts such as module benefits, execution, and structure, this quiz is perfect for anyone looking to reinforce their understanding of modular programming. Answer questions related to module naming rules and local variables.