CHAPTER 7—ARRAYS AND STRINGS

CHAPTER 7—ARRAYS AND STRINGS 

Questions:
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1. An array element is accessed using
a. a first-in-first-out approach.
b. the dot operator.
c. a member name.
d. an index number.
2. All the elements in an array must be the _________ data type.
3. Write a statement that defines a one-dimensional array called doubleArray of type double that holds 100 elements.
4. The elements of a 10-element array are numbered from ________ to ________.
5. Write a statement that takes element j of array doubleArray and writes it to cout with the insertion operator.
6. Element doubleArray[7] is which element of the array?
a. The sixth
b. The seventh
c. The eighth
d. Impossible to tell
7. Write a statement that defines an array coins of type int and initializes it to the values of the penny, nickel, dime, quarter, half-dollar, and dollar.
8. When a multidimensional array is accessed, each array index is
a. separated by commas.
b. surrounded by brackets and separated by commas.
c. separated by commas and surrounded by brackets.
d. surrounded by brackets.
9. Write an expression that accesses element 4 in subarray 2 in a two-dimensional array called twoD.
10. True or false: In C++ there can be an array of four dimensions.
11. For a two-dimensional array of type float, called flarr, write a statement that declares the array and initializes the first subarray to 52, 27, 83; the second to 94, 73, 49; and the third to 3, 6, 1.
12. An array name, used in the source file, represents the ________ of the array.
13. When an array name is passed to a function, the function
a. accesses exactly the same array as the calling program.
b. accesses a copy of the array passed by the program.
c. refers to the array using the same name as that used by the calling program.
d. refers to the array using a different name than that used by the calling program.
14. Tell what this statement defines: employee emplist[1000];
15. Write an expression that accesses a structure member called salary in a structure variable that is the 17th element in an array called emplist.
16. In a stack, the data item placed on the stack first is
a. not given an index number.
b. given the index number 0.
c. the first data item to be removed.
d. the last data item to be removed.
17. Write a statement that defines an array called manybirds that holds 50 objects of type bird.
18. True or false: The compiler will complain if you try to access array element 14 in a 10-element array.
19. Write a statement that executes the member function cheep() in an object of class bird that is the 27th element in the array manybirds.
20. A string in C++ is an _________ of type _________.
21. Write a statement that defines a string variable called city that can hold a string of up to 20 characters (this is slightly tricky).
22. Write a statement that defines a string constant, called dextrose, that has the value “C6H12O6-H2O”.
23. True or false: The extraction operator (>>) stops reading a string when it encounters a space.
24. You can read input that consists of multiple lines of text using
a. the normal cout << combination.
b. the cin.get() function with one argument.
c. the cin.get() function with two arguments.
d. the cin.get() function with three arguments.
25. Write a statement that uses a string library function to copy the string name to the string blank.
26. Write the declaration for a class called dog that contains two data members: a string called breed and an int called age. (Don’t include any member functions.)
27. True or false: You should prefer C-strings to the Standard C++ string class in new programs.
28. Objects of the string class
a. are zero-terminated.
b. can be copied with the assignment operator.
c. do not require memory management.
d. have no member functions.
29. Write a statement that finds where the string “cat” occurs in the string s1.
30. Write a statement that inserts the string “cat” into string s1 at position 12.
__________

My answers:
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1. an index number.
2. same.
3. double doubleArray[100];
4. 0, 9.
5. cout<<doubleArray[j-1];
6. The eighth.
7. int coins[6] = {penny, nickel, dime, quarter, half-dollar, dollar};
8. surrounded by brackets.
9. twoD[1][3];
10. True;
11. float flarr[3][3] = {52,27,83, 94,73,49, 3,6,1};
12. name.
13. accesses exactly the same array as the calling program.
14. An array called emplist of type employee with size 1000.
15. emplist[16].salary;
16. the last data item to be removed.
17. bird manybirds[50];
18. False.
19. manybirds[26].cheep();
20. array, char.
21. char city[21];
22. const char[] = “C6H12O6-H2O”;
23. True.
24. the cin.get() function with three arguments.
25. strcpy(name, blank);
26. class dog{ string breed; int age;};
27. False.
28. can be copied with the assignment operator, do not require memory management.
29. s1.find("cat");
30. s1.insert(12, "cat");
___________

Answers:
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1. d
2. same
3. double doubleArray[100];
4. 0, 9
5. cout << doubleArray[j];
6. c
7. int coins[] = { 1, 5, 10, 25, 50, 100 };
8. d
9. twoD[2][4]
10. True
11. float flarr[3][3] = { {52,27,83}, {94,73,49}, {3,6,1} };
12. memory address
13. a, d
14. an array with 1000 elements of structure or class employee
15. emplist[16].salary
16. d
17. bird manybirds[50];
18. False
19. manybirds[26].cheep();
20. array, char
21. char city[21] (An extra byte is needed for the null character.)
22. char dextrose[] = “C6H12O6-H2O”;
23. True
24. d
25. strcpy(blank, name);
26.
class dog
{
private:
char breed[80];
int age;
};

27. False
28. b, c
29. int n = s1.find(“cat”);
30. s1.insert(12, “cat”);
________