Computer Programming Basics
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Questions and Answers

What is a computer?

An electronic device that accepts data from the user.

What is the difference between data and information?

Data is unstructured facts and figures, while information is structured data.

What are the two main types of software?

System software and application software.

What is the purpose of system software?

<p>It operates directly on hardware devices of the computer to provide a platform to run applications.</p> Signup and view all the answers

What is the purpose of application software?

<p>To perform specific tasks, such as word processing, spreadsheet calculations, or presentations.</p> Signup and view all the answers

What is a program?

<p>A list of instructions that the computer must follow to process data into information.</p> Signup and view all the answers

What is the main requirement to develop a program?

<p>We need to use our mind power or logic to develop the detailed instructions.</p> Signup and view all the answers

What are the five steps of programming?

<p>Define the problem, Design the solution/program, Code the program, Test the program, Document the program</p> Signup and view all the answers

What is the top-down approach in programming?

<p>The overall task is first fixed in terms of generalized sub-tasks, making the process more defined.</p> Signup and view all the answers

What is modularization in programming?

<p>Long programs are split into smaller programs, each with specific functions.</p> Signup and view all the answers

What is pseudo-code?

<p>A plain language description of the steps in an algorithm or another system.</p> Signup and view all the answers

How is the logic of a program translated into a high-level programming language?

<p>Through program coding, which involves converting the pseudo-code or flowcharts into a programming language.</p> Signup and view all the answers

What is the difference between syntax and semantics?

<p>Syntax refers to the grammatical structure of the code, while semantics refers to the meaning and interpretation.</p> Signup and view all the answers

What does program testing involve?

<p>Desk checking, debugging, and running real data to ensure the program works as intended.</p> Signup and view all the answers

What is desk checking in program testing?

<p>Reading through the program and correcting any errors manually.</p> Signup and view all the answers

What is debugging in program testing?

<p>Detecting, locating, and removing errors in the program.</p> Signup and view all the answers

What are syntax errors?

<p>Typographical errors or incorrect formatting in the code.</p> Signup and view all the answers

What are logical errors?

<p>Mistakes in the program's source code that result in incorrect output or program crashes.</p> Signup and view all the answers

What is documenting a program?

<p>Writing descriptions of what the program is about and how to use it.</p> Signup and view all the answers

What is user documentation for a program?

<p>A manual that helps the user understand how to use the program.</p> Signup and view all the answers

What is operator documentation for a program?

<p>A manual that provides information on what to do when the program displays error messages.</p> Signup and view all the answers

What is program documentation for a program?

<p>This documentation aids in training new programmers on how to maintain the existing system.</p> Signup and view all the answers

What is program logic formulation?

<p>The step-by-step development of a solution to a given problem.</p> Signup and view all the answers

Why is program logic formulation considered the most difficult part of solving a problem on a computer?

<p>It requires a deep understanding of the problem and the ability to translate it into a series of instructions that a computer can understand.</p> Signup and view all the answers

What is a flowchart?

<p>A visual representation of the steps involved in a program, using boxes with different shapes that contain simple statements or instructions connected by lines.</p> Signup and view all the answers

What is a system flowchart?

<p>A flowchart that represents a targeted system as a whole.</p> Signup and view all the answers

What is a program flowchart?

<p>A flowchart that describes processing procedures based on a detailed analysis.</p> Signup and view all the answers

What is the purpose of flowchart development?

<p>To organize the steps in a flowchart in an orderly, understandable, and clear manner.</p> Signup and view all the answers

What are the three basic methods of control used in structured flowcharts?

<p>Sequential structure, selection structure, and repetition structure.</p> Signup and view all the answers

What are the main characteristics of a sequential structure?

<p>It is a strictly sequential manner of execution, where each step is executed exactly once.</p> Signup and view all the answers

What is the purpose of a selection structure?

<p>To choose one of several alternative actions based on a decision.</p> Signup and view all the answers

What is an algorithm?

<p>A set or series of instructions that solves a specific problem.</p> Signup and view all the answers

What are the characteristics of an algorithm?

<p>It should be a single thought, expressed in an understandable English language, and can be represented as pseudo-code.</p> Signup and view all the answers

What is pseudo-code in relation to algorithms?

<p>A way to express algorithms in a clear and organized manner, similar to a flowchart.</p> Signup and view all the answers

What is the basic combined programming language (BCPL)?

<p>A high-level programming language developed in 1967 by Martin Richards.</p> Signup and view all the answers

What are the key differences between BCPL and B programming languages?

<p>B was developed as a type &quot;less&quot; language, while C introduced data types.</p> Signup and view all the answers

What is Turbo C?

<p>A version of the C programming language that runs on various microcomputer systems.</p> Signup and view all the answers

What is source code?

<p>Text that users can read and understand.</p> Signup and view all the answers

What is an interpreter in programming?

<p>A program that reads source code line by line and executes it immediately.</p> Signup and view all the answers

What is a compiler in programming?

<p>A program that converts source code into machine-readable object code.</p> Signup and view all the answers

What is compile time?

<p>The time when events occur while compiling a program.</p> Signup and view all the answers

What is run time?

<p>The time when events occur while a program is executing.</p> Signup and view all the answers

What is a runtime error?

<p>An error that occurs during run time and can cause the program to crash.</p> Signup and view all the answers

What is a library in programming?

<p>A collection of pre-written code modules that can be used in multiple programs.</p> Signup and view all the answers

What are the key components of Turbo C?

<p>Editor, extended C language, compiler, debugger, run-time environment, and user interface.</p> Signup and view all the answers

What is the purpose of the editor in Turbo C?

<p>To create and modify source code.</p> Signup and view all the answers

What is the purpose of the extended C language in Turbo C?

<p>To provide a more comprehensive and standardized version of the C language.</p> Signup and view all the answers

What is the purpose of the compiler in Turbo C?

<p>To convert source code into machine-readable object code.</p> Signup and view all the answers

What is the purpose of the debugger in Turbo C?

<p>To find and fix errors in the program.</p> Signup and view all the answers

What is the purpose of the run-time environment in Turbo C?

<p>To provide the necessary support for running the compiled program.</p> Signup and view all the answers

What is the purpose of the user interface in Turbo C?

<p>To provide an integrated environment for all aspects of program development, from editing and compiling to debugging and running.</p> Signup and view all the answers

What are identifiers in C?

<p>Names used to reference variables, functions, labels, and other user-defined objects.</p> Signup and view all the answers

What are the rules for naming identifiers in C?

<p>They must start with a letter or underscore, can contain letters, numbers, and underscores, and are case-sensitive.</p> Signup and view all the answers

What are simple data types in C?

<p>Basic building blocks of data that represent specific kinds of values.</p> Signup and view all the answers

What is the purpose of the int data type in C?

<p>To store whole numbers.</p> Signup and view all the answers

What is the purpose of the short int data type in C?

<p>To store whole numbers with a smaller range than the int data type.</p> Signup and view all the answers

What is the purpose of the unsigned int data type in C?

<p>To store non-negative whole numbers.</p> Signup and view all the answers

What is the purpose of the double data type in C?

<p>To store double-precision floating-point numbers.</p> Signup and view all the answers

What are variables in C?

<p>Identifiers that can be assigned a value within a program.</p> Signup and view all the answers

What is variable declaration in C?

<p>The process of defining a variable by giving it a name and a data type.</p> Signup and view all the answers

What is variable initialization in C?

<p>The process of assigning an initial value to a variable.</p> Signup and view all the answers

What are the three ways of initializing variables in C?

<p>By assignment, using the scanf function, and during declaration.</p> Signup and view all the answers

What are global variables in C?

<p>Variables declared outside of any function, making them accessible from anywhere in the program.</p> Signup and view all the answers

What are constants in C?

<p>Fixed values that cannot be changed by the program.</p> Signup and view all the answers

What are character constants in C?

<p>Single characters enclosed in single quotes.</p> Signup and view all the answers

What are integer constants in C?

<p>Whole numbers without a decimal point.</p> Signup and view all the answers

What are floating-point constants in C?

<p>Numbers with a decimal point.</p> Signup and view all the answers

What are string constants in C?

<p>Sequences of characters enclosed in double quotes.</p> Signup and view all the answers

What are declared constants in C?

<p>Constants defined using the #define directive, associating a name with a constant value.</p> Signup and view all the answers

What is the const modifier in C?

<p>A modifier that prevents the value of a variable from being changed after initialization.</p> Signup and view all the answers

How is the const modifier used in C?

<p>It is declared before the variable name in the variable declaration.</p> Signup and view all the answers

What is the #define directive in C?

<p>A preprocessor directive used for defining symbolic constants or macros.</p> Signup and view all the answers

How is the #define directive used in C?

<p>It is used at the beginning of the program to define constants or macros that are used throughout the code.</p> Signup and view all the answers

What are type modifiers in C?

<p>Keywords or symbols that modify the size or behavior of a data type.</p> Signup and view all the answers

What is the purpose of the assignment statement in C?

<p>To assign a value to a variable.</p> Signup and view all the answers

What is the assignment operator in C?

<p>The equal sign (=), used to assign a value to a variable.</p> Signup and view all the answers

What are operators in C?

<p>Symbols that perform specific mathematical, relational, or logical operations on variables.</p> Signup and view all the answers

What are conditional statements or constructs in C?

<p>Statements that allow for conditional execution of code based on specific conditions.</p> Signup and view all the answers

What is a single-selection construct?

<p>A conditional statement that executes one block of code if a condition is true and skips it if the condition is false.</p> Signup and view all the answers

What is an if statement in C?

<p>A single-selection construct that executes a block of code if a condition is true.</p> Signup and view all the answers

What is a nested if statement?

<p>An if statement that is used as the statement part of another if statement.</p> Signup and view all the answers

What is a multiple selection construct?

<p>A statement that allows for choosing between multiple options based on a value.</p> Signup and view all the answers

What is a switch statement in C?

<p>A multiway conditional statement that generalizes the if-else statements.</p> Signup and view all the answers

What is the switch expression in a switch statement?

<p>An expression that evaluates to an integer, character, or floating-point value.</p> Signup and view all the answers

What is a case block in a switch statement?

<p>A block of code that is executed if the switch expression matches the value of the case label.</p> Signup and view all the answers

What does the break keyword do in a switch statement?

<p>It causes the program's execution to jump to the end of the switch statement.</p> Signup and view all the answers

What is an unconditional transfer statement?

<p>A statement that alters the program's flow of execution without any conditions.</p> Signup and view all the answers

What is the break statement in C?

<p>A statement used to terminate a case in a switch statement or to exit an iteration of a loop.</p> Signup and view all the answers

What is the continue statement in C?

<p>A statement used to skip the current iteration of a loop and continue with the next iteration.</p> Signup and view all the answers

What is the purpose of the system("cls") function in C?

<p>To clear the console screen.</p> Signup and view all the answers

Study Notes

Computer Programming

  • Computer: An electronic device that accepts data from the user.
  • Data: Unstructured facts and figures; lacks information about patterns, context, etc.
  • Information: Structured data.
  • Hardware: Mechanical devices that make up a computer. Interconnected electronic devices that control input, output, and the computer's information.
  • Computer Hardware: Components that work together.
  • Software: A set of instructions, also called a program.

Two Types of Software

  • System Software: Operates directly on computer hardware. Used to run applications (e.g., Linux, Unix, Windows).
  • Application Software: Used to perform tasks (e.g., Word, Excel, PowerPoint, Oracle).

Program or Software

  • A list of instructions that the computer must follow to process data into information.
  • To solve a problem, use logic to develop detailed instructions.

Five Steps of Programming

  • Define the problem.
  • Design the solution/program.
  • Code the program.
  • Test the program.
  • Document the program.

Top-Down Approach

  • The overall task is broken down into generalized subtasks.

Modularization

  • Long programs are split into smaller programs.

Pseudocode

  • A plain language description of steps in an algorithm or system.

Program Coding

  • Translates program logic (using pseudocode or flowcharts) into a programming language.

Syntax

  • Grammatical structure of a programming language.

Semantics

  • Meaning and interpretation of a programming language.

Program Testing

  • Desk checking, debugging, and running real data to ensure a program works correctly.

Desk Checking

  • Manually reading through a program's code to find errors.

Debugging

  • Detecting, locating, and removing program errors.

Syntax Errors

  • Typos or incorrect formatting.

Logical Errors

  • Mistakes in the source code, leading to wrong outputs or program crashes.

Documenting the Program

  • Written descriptions of the purpose and usage of a program.

User Documentation

  • Manual helping users understand how to use the program.

Operator Documentation

  • Manual giving the computer operator instructions on program errors messages and actions to take.

Program Documentation

  • Documentation is used to train new programmers on maintaining existing computer systems.

Program Logic Formulation

  • Step-by-step development of a solution to a problem.

Flowchart

  • Visual representation of a program or algorithm using boxes with different shapes connected by lines.

System Flowchart

  • Flowchart for a complete targeted system.

Program Flowchart

  • Flowchart that illustrates the detailed process of a program.

Structured Flowchart

  • Orderly, understandable, and clear solution using three basic methods of control.

Sequential Structure

  • Strict sequence of instructions.

Selection Structure

  • The program chooses between multiple actions.

Repetition Structure

  • Steps that are repeated.

Algorithm

  • A set or series of instructions.

Algorithm Development

  • Creating algorithms using flowcharts/pseudocode, and ensuring they are understandable and clear.

High-Level Languages

  • Programming languages used by computers.

Symbolic Names (Identifiers)

  • Names used in programs to represent quantities.

Input/Output Operations

  • Read or enter (input) or display, print, and write (output)

Basic Combined Programming Language (BCPL)

  • Programming language developed in 1967.

B Language

  • Programming language developed in 1970, used for the first UNIX system.

C Language

  • Programming language developed in 1972, designed for the UNIX operating system.

Turbo C

  • Version of C used on microcomputers developed by Borland.

Source Code

  • Text that users can read.

Interpreter

  • Reads source code.

Compiler

  • Converts source code to object code.

Object Code

  • Code executed by the computer.

Compile Time

  • Events during the compilation process.

Run Time

  • Events during program execution.

Syntax Errors (Run Time)

  • Errors detected during program execution.

Logical Errors (Run Time)

  • Errors detected when the output is incorrect.

Runtime Errors

  • Errors that arise during the program's execution, often when a program asks for an integer or number input but receives text.

Library

  • Collection of pre-written codes.

Turbo C Environment

  • Complete Software environment for creating, testing, and running Turbo C programs.

Turbo C Components

  • Editor: Used to produce source code.
  • Extended C Language: Makes Turbo C compatible with updated standards.
  • Compiler: Converts source code into machine code.
  • Debugger: Helps test and diagnose errors.
  • Run-time Environment: System enables program execution.
  • User Interface (UI): A user-friendly interface for the Turbo C environment.

Identifiers (C Language)

  • Names used to refer to objects in the program.

Rules for Naming Identifiers

  • Names must start with a letter or underscore and can include subsequent letters, numbers, or underscores. No spaces or hyphens. First 63 characters are significant, and the case matters.

Data Types (C Language)

  • Simple Data Types (int/integer): Whole numbers (optional + or -), followed by digits; cannot contain commas. Used in conditional statements and loops.
  • Short int: Byte size 2. Range -32768 to +32767.
  • Long int: Byte size 4. Range -2,147,483,648 to +2,147,483,647.
  • Float: Signed numbers with decimal points and/or digits after the decimal. Occupies 4 bytes
  • Double: Special float storing more significant digits. Occupies 8 bytes. Range 1.7E-308 to 1.7E+308.
  • Char: Single letter, digit, punctuation mark, or control symbol within single quotes. Can be assigned an integer between -128 and +127.
  • Unsigned Char: - Can be assigned values from 0 to 255.
  • Void: Declares a function that returns no value.

Variables (C Language)

  • Identifiers that hold values.
  • Declaration: Give a variable a name and reserves memory.
  • Initialization: Assign values to variables. Can be done in declaration or later.
  • Global Variables: Declared outside functions; accessible throughout the program. Initialized to zero unless otherwise specified.
  • Local Variables: Declared inside functions; only accessible within that function. Initialized to zero unless otherwise specified.

Constants (C Language)

  • Fixed values that cannot be changed during program execution.
  • Types of constants: character, integer, floating-point, and string.

Modifiers (C Language)

  • Const: Variables declared as const cannot be changed during program execution.
  • #Define, Const: Symbols used for declaring constants.
  • Type Modifiers: Used to adjust the meaning of a basic data type (e.g., short, long).

Assignment Statements

  • Used to assign values to variables using the '=' operator.

Operators

  • Symbols used for mathematical, relational, and logical operations.

Conditional Statements

  • If, else, switch: Used to control program flow based on conditions.

Single Selection Statements

  • If/if-else statements

Multiple Selection Constructs

  • Switch statements: Executes code blocks based on different conditions.

Unconditional Transfer Statements

  • Break Statement: Terminates a loop or a switch case block.
  • Continue Statement: Skips the rest of the current loop iteration while the loop continues to run .

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Description

This quiz covers the fundamental concepts of computer programming, including definitions of data, information, hardware, and software. It also explores the two main types of software: system and application software. Additionally, the five steps of programming are outlined to provide a comprehensive understanding of the programming process.

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