Deitel C++ Chapter 2

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  1. What is the purpose of comments and how are they denoted?
    // Comment lines begin with // because it tells the program to skip the line. They can also be written across several lines with /* and */

    Comments document programs and improve readability.
  2. What is a preprocessor directive? Give an example.
    They are processed by the preprocessor before the program is compiled. They begin with a #. They do not end with a semi-colon.

    #include <iostream>
  3. What does the line #include <iostream>
    It tells the preprocessor to include the input/output stream header in the program.

    It allows std::cin and std::cout and operators << and >> to be used in the program.
  4. What is the purpose of white-space?
    White space makes programmers easier to read. They are ignored by the compiler.
  5. What is main ?
    The program begins executing at main even if it does not appear first in the program.
  6. What does the keyword int do?
    Returns an integer value.

    • example:
    • int main ()
  7. Explain the purpose of braces. { }
    The left brace { begins the body of the function.

    The right brace } ends the body of the function.
  8. What are other names for a "string"?
    A character string, message string, or string literal.
  9. What is a statement terminator?
    Every statement must end with a semicolon.
  10. What is the output stream object?
  11. What is the input stream object?
  12. How are multiple data items concatated for output?
    With stream insertion operators.

  13. How are multiple data items concatated for input?
    With stream extraction operators.

  14. std::cout is normally connected to which hardware device?
    the screen for output
  15. std::cin is normally connected to which hardware device?
    the keyboard for input
  16. What is conversational computing (or interactive computing)?
    Interaction between the user and the computer.

    • examples:
    • std::cout std::cin
  17. How is an escape sequence formed and what does it do?
    An escape sequence is formed from a backslash \ and the next character.

    • i.e.
    • \ncreates a new line
  18. Define prompt.
    A message that directs the user to take a specific action.
  19. Define the keyword
    (one of several means to) exit a function
  20. All variables in a C++ program must be _________ before they can be used.
  21. What are the rules for naming a variable in C++?
    • can contain letters, digits, and underscores (_)
    • cannot start with a digit
    • can be any length (some systems may impose limits on length)
    • cannot be one of the preset names (such as cout)
  22. Is C++ case sensitive?
    Yes, C++ is case sensitive.
  23. Where are calculations performed?
    Most calculations are performed in assignment statements.
  24. What is the name of a location in the computer's memory where a value can stored for use by a program?
    a variable
  25. What does the variable int hold?
    integer values, i.e. whole numbers

    • i.e.
    • -7, 11, 0, 23901
  26. Every variable stored in the computer's memory has:
    • 1) a name
    • 2) a value
    • 3) a type
    • 4) a size
  27. What does it mean when the process is nondestructive?
    A copy of the value is read, leaving the original value undisturbed.

    (keyword = read)
  28. What does it mean with the process is destructive?
    The new value replaced the previous value in that location. The previous value is lost.

    (think: write)
  29. What does the std::endl stream manipulator do?
    Outputs a newline, then flushes the output buffer.
  30. What are the order of operations for C++ arithmetic expressions?
    • ( ) (nested first)
    • * / % (from left to right)
    • + - (from left to right)
  31. When dividing integers in C++, does it return a decimal, fraction, or neither? Does it round the integer to the nearest whole number?
    None of the above. Any fractional part of the answer is truncated and no rounding occurs.

    • i.e.
    • mathematical answer: 346.875
    • C++ answer: 346
  32. What is the purpose of the modulus operator? What is the symbol used?
    The modulus operator, or %, yields the remainder after integer division. (It can only be used with integers.)

    • mathematical answer: 346.875
    • C++ % answer: 875
  33. What is an

    statement? What is the format for using one?
    It allows a program to make a decision when a certain condition is met. If the condition is true, the statement in the body of the statement is executed. If it is not true, the statement is skipped.

    • if (condition)
    • statement;
  34. What is a relational operator? What is an equality operator? Which one has precedence?
    • Relational Operators: > and < and derivatives
    • Equality Operators: = and derivatives
    • Relational operators have precedence.
  35. What is the purpose of the declaration using


    at the beginning of the program?
    The declaration eliminates the need to repeat the


    prefix. All that needs to be written thereafter is

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Deitel C++ Chapter 2
2011-02-13 21:36:17
Deitel Dietel

Introduction to C++ Programming
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