CSC 213 - Introduction to Structured Programming

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Questions and Answers

Which of the following best describes the sequence structure in structured programming?

Executing lines or blocks of code in a specific order. (correct)

Executing repetitive actions until a condition is false.

Deciding which task to execute based on conditions.

Executing tasks based on user input.

What is the purpose of the structured program theorem?

To highlight the inefficiencies of unstructured programming.

To outline the advantages of using higher-level programming languages.

To demonstrate that sequencing, selection, and iteration can express any computable function. (correct)

To explain how to write and analyze structured programs.

Who is mainly credited with advancing the principles of structured programming?

Ole-Johan Dahl

E.W. Dijkstra (correct)

Tony Hoare

David Gries

Why is structured programming considered easier to read and maintain?

It reduces the number of lines and codes by using modular forms. Signup and view all the answers

In structured programming, what is meant by 'repetition'?

Repeating a block of code while a condition is true. Signup and view all the answers

Which aspect of structured programming primarily focuses on breaking down tasks into smaller subtasks?

Modularity Signup and view all the answers

How can programmers implement structured programming?

Using any programming language, but preferably procedural languages. Signup and view all the answers

What major contribution did authors like Dijkstra and Floyd make to structured programming?

They addressed how to write and analyze usefully structured programs. Signup and view all the answers

Which of the following languages is NOT typically classified under structured programming?

Assembly Signup and view all the answers

What is the primary advantage of structured programming over unstructured programming?

It improves readability and maintainability. Signup and view all the answers

Which of the following is a key characteristic of a structured program?

Single entry and single exit elements Signup and view all the answers

Which of the following statements about structured programming is True?

It enforces a logical structure to programs. Signup and view all the answers

What are the three types of elements primarily involved in structured programming?

Selection, Sequence, Iteration Signup and view all the answers

What is a common misconception about structured programming?

It is applicable only in older programming languages. Signup and view all the answers

Why might GOTO statements be avoided in structured programming?

They can make the flow of execution harder to follow. Signup and view all the answers

Which of the following languages is an example of a structured programming language?

Python Signup and view all the answers

Study Notes

Introduction to Structured Programming

Structured programming focuses on three main constructs: sequence, repetition, and selection.
Sequence involves executing lines or blocks of code in order.
Repetition allows for repeating a code block while a condition remains true.
Selection entails outlining major tasks and refining them into smaller, understandable subtasks, as proposed by E.W. Dijkstra in 1969.
The structured program theorem states that sequencing, selection, and iteration are sufficient to express any computable function.

Historical Context

Dijkstra's contributions to structured programming were influenced by work from Böhm and Jacopini in 1966.
The structured program theorem also relates to concepts in CPU instruction cycles and Turing machines.
Key figures in the late 1960s and early 1970s, including Robert W. Floyd and Tony Hoare, added to the development of structured programming principles.

Importance of Structured Programming

Follows a top-to-bottom design approach.
Emphasizes data structures and subroutines for easier task management.
Modular form makes programs simpler, leading to improved readability and reduced code length.

Languages for Structured Programming

Any programming language can support structured programming, but procedural languages are preferable.
Early languages used for structured programming include ALGOL, Pascal, PL/I, and Ada.
Modern procedural languages often integrate features encouraging structured programming and may exclude elements like GOTO to restrict unstructured programming.

Structured Programming Approach

The approach ensures programs execute instructions in a linear, structured manner without jumps.
Supported by programming languages such as C, C++, Java, and C#.
Assembly languages, like Microprocessor 8085, do not inherently support structured execution and allow GOTO statements, leading to non-linear flows.

Elements of Structured Programs

Structured programs consist of three key elements:
- Selection Statements
- Sequence Statements
- Iteration Statements
Structured programs have single-entry and single-exit points, promoting maintenance and clarity.

Advantages of Structured Programming

Enhances code readability and comprehension.
Facilitates program maintenance and modifications, making it a preferred approach in software development.

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Description

This quiz explores the fundamental concepts of structured programming, focusing on the three essential constructions: sequence, repetition, and selection. Understand how these constructs form the backbone of structured programming through various coding examples and theoretical questions.