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Questions and Answers
What is the only function that all C++ programs must contain?
What is the only function that all C++ programs must contain?
What is the purpose of comments in a C++ program?
What is the purpose of comments in a C++ program?
What is a location in the computer's memory that may contain different values at various times throughout the execution of a program?
What is a location in the computer's memory that may contain different values at various times throughout the execution of a program?
Which of the following is a valid variable name in C++?
Which of the following is a valid variable name in C++?
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Which of the following data types is assigned only an integer value 1 or 0?
Which of the following data types is assigned only an integer value 1 or 0?
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What is the correct way to declare a variable as a string?
What is the correct way to declare a variable as a string?
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Which of the following is a valid variable declaration?
Which of the following is a valid variable declaration?
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What is the object used to input values from the keyboard?
What is the object used to input values from the keyboard?
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What is the correct way to declare a constant variable?
What is the correct way to declare a constant variable?
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What is the output of the statement cout << x + y << endl;
What is the output of the statement cout << x + y << endl;
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Study Notes
C++ Basics
- The only function that C++ programs must contain is main().
Code Blocks
- Code blocks in C++ are signaled by { and } punctuation.
Statements
- Every statement in C++ should end with a ; (semicolon).
- . (dot) is not used to end statements.
Comments
- Comments are used to document a program and improve its readability.
- Comments can be written using / */*, but not \.
- Comments are neglected by the compiler.
- Comments can be written anywhere in the program, not just at the top.
Variables
- A variable is a location in the computer's memory that may contain different values at various times throughout the execution of a program.
- Variable names can start with _ (underscore), but not with a number or space.
- A valid variable name is delta_univ, but not delte univ or delta-univ.
Data Types
- bool is a data type that can only be assigned an integer value of 1 or 0.
- float and double are valid data types, but real is not.
- char is a data type used to define a single character, and can be declared as char ch = 'Z';.
Variable Declaration
- A valid variable declaration is int a;, but not int a,, int a, or int a:.
Constants
- A correct declaration of a constant is const float PI = 3.14;, but not float PI 3.14; or # define PI = 3.14;.
Input/Output Objects
- The object used to print information on the screen is cout.
- The object used to input a value from the keyboard is cin.
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Description
Test your knowledge of the fundamental concepts of C++ programming language, including functions and code blocks.
