1. Instructor - C. BoyleFall Semester - 2015 cboyle@cs.odu.edu

2. This was an in-class exercise, and something may have changed, SO Do not count on the accuracy of the solutions in this presentation! Verify With Your Textbook! Look Up The Answers Yourself!

3. Q#1 Question Which of the following methods for inserting comments in a C++ program are valid? Answer \\ comments in your program \* comments in your program *\ /* comments in your program */ #comments in your program

4. Q#1-Solution There are two methods for inserting comments in a C++ program: a comment can begin with the characters // or a comment can begin with the characters /* and then end with the characters */

5. Q#2 Question Question True or False: The setw manipulator cannot use a string as an argument. Answer True False

6. Q#3 Question Consider the following preprocessor directive: #include The directive specifies that the statements in the file: ANSWER contains a constant we use in executing loops. contains information related to the input statement used in the program contains info related to functions used to compute the sum of a value. contains a comment we use in exiting the program.

7. Q#4 Question Multiple Answer Question The main function contains two types of statements: Answer statements that define memory locations which will be used in the program pre-processor statements that define additional code to be inserted. statements that specify actions to be taken. post-processor statements that define additional code to executed.

8. Q#5 Question Question True or False: The if…else statement is a one-way selection structure. Answer True False

9. Q#6 Question Multiple Answer Question //define and initialize variables double quizscore1, quizscore3, quiz4=10, averagescore=4.0, avg, sumscores; This statement specifies that Answer the program will use five variables. the variable quiz4 should be initialized to the value of 10.0. the variable average should be initialized to the value of 10.0. nothing, because it should all be on one line.

10. Q#7 Question Question Rules for selecting a valid identifier are: Answer An identifier cannot begin with an alphabetic character or the underscore character. Alphabetic characters in an identifier must be lower case letters. An identifier can be of any length. Alphabetic characters in an identifier can be lower case or upper case letters.

11. Q#8 Question Question The following is a valid identifier: 1_quiz Answer True False

12. Q#9 Question Question The following is a valid identifier: max-value Answer True False

13. Q#10 Question Question The following is a valid identifier: $uperMan Answer True False

14. Q#11 Question Question True or False: File stream variables are predefined in the fstream header file and associated with input/output sources. Answer True False

15. Q#12 Question Question C++ is case sensitive, that is, it distinguishes upper case letters from lowercase letters. Thus Sum, sum, and SUM represent three ways of safely working with the same variable value. Answer True False

16. Q#13 Question Question The difference between the float, double, and long double types relates to the Answer exponent (or accuracy) and length of the values represented. precision (or accuracy) and range of the values represented. exponent (short accuracy), range (long accuracy) and length of the values represented. precision (or accuracy) and range of the libraries included.

17. Q#14 Question Question A float value will have a wider range of values for exponents than a double value. Answer True False

18. Q#15 Question Multiple Answer Question Select the true statements, concerning symbolic constants: Answer The compiler will replace each occurrence of the constant identifier with the constant value. Constant declarations, like variable declarations, and with a colon. ( : ) Several symbolic constants can be declared in one statement if they have the same data type. A symbolic constants is declared by prefixing a declaration with the const specifier.

19. Q#16 Question Question The assignment statements below define and initialize the variables at the same time. double sum, total; total = 10; sum = total; Answer True False

20. Q#17 Question Question Multiple assignments are allowed in C++, as in the following statement, which assigns a value of zero to each of the variables x,y, and z. x = y = z = 0; Answer True False

21. Q#18 Question Question What is an enumeration type? Answer C++’s method for allowing programmers to create their own simple data types. C++’s method for allowing programmers to use numerals to update control structures. One of C++’s simple integer data types, such as int. C++’s library of available numerical variables.

22. Q#19 Question Question An expression that has operands of different data types is called a(n) Answer mixed expression homogenous expression simple enumerated expression

23. Q#20 Question Question What is the syntax for declaring single or multiple variables? Answer dataType identifier, identifier, …; variableName dataType identifier, identifier, …; dataName identifierType, identifierType, …; identifier, identifier, …;

24. Q#21 Question Question True or False: The semantic rules of a language tell you what is legal and what is not legal. Answer True False

25. Q#22 Question Question What is the syntax of the ignore function? Answer cin.ignore(intExp, chExp); cout<< stringName.ignore(intExp, intExp); cin>> stringName.ignore(intExp, intExp); int value.stringName.ignore(intExp, intExp);

26. Q#23 Question Question The header file ______________ needs to be included to use the setw function. Answer iomanip iostream iosetw cmath

27. Q#24 Question Question Which of the following would you use as a statement to format the output of decimal numbers to two decimal places? Answer cout << setprecision(2); cin << setprecision(2); cout << setdotwidth( ); cout >> setw.setprecision(2);

28. Q#25 Question Question Which of the following are true? Answer The if…else statement is a two-way selection structure. A unary operator takes three operands. The equality operator in C++ is = A relational operator allows you to make comparisons in a program.

29. QUESTIONS?Assignments: Quiz due before class on Tuesday