CS010
Fall UCR 2003
Introduction to Computer Science I
Kris Miller, Dr. Brian Linard
Final
Time: 170 minutes
1. In C++ only one of the following is a valid indentifier (i.e. can be used as a name for a variable
or function, etc.). Which is it?
a.
b.
c.
d.
e.
number-of-elements
break
TOOMUCH
2fast
xy&z
2. Before a variable can be used in C++ it must be:
a.
b.
c.
d.
declared
initialized
inserted into a namespace
referenced in the header
3. What is the value of x after the following statements?
int x;
x = x + 30;
a.
b.
c.
d.
0
33
30
garbage
4. What is the value of x after the following statements?
double x;
x = 15/4;
a.
b.
c.
d.
3.75
4.0
3.0
60
5. What is the value of x after the following statements?
int x;
x = 15%4;
a.
b.
c.
d.
15
3
4
3.75
6. Given the following code fragment, what is the final value of y?
int x, y;
x = -1;
y = 0;
while(x < 3)
{
x += 1;
y += 2;
}
a.
b.
c.
d.
8
10
6
4
7. Given the following code fragment, what is the output?
int x=5;
if( x > 5)
cout << "x is bigger than 5. ";
cout <<"That is all. ";
cout << "Goodbye\n";
a.
b.
c.
d.
x is bigger than 5. That is all
x is bigger than 5
That is all. Goodbye
Goodbye
8. Executing one or more statements one or more times is known as:
a.
b.
c.
d.
selection
iteration
sequence
algorithm
9. Assuming num1, num2, and num3 have been declared and initialized as variables of type int,
which of the following is a correct function call for the following function declaration?
void product_output(int n1, int n2, int n3);
a.
b.
c.
d.
e.
void product_output(int num1, int num2, int num3);
void product_output(num1, num2, num3);
product_output(num1, num2, num3);
output = product_output(num1, num2, num3);
void output = product_output(num1, num2, num3);
10. What is wrong with the following function definition?
void add_tax(double tax_rate, double& cost)
{
cost = cost + ( tax_rate / 100.0 ) * cost;
}
a.
b.
c.
d.
The formal parameter, cost, should be pass-by-value, not pass-by-reference.
The formal parameter, tax_rate, should be pass-by-reference, not pass-by-value.
The function does not have a return statement.
You cannot have a pass-by-value parameter and a pass-by-reference parameter in the
same function definition.
e. None of the above.
11. What is wrong with the following function definition?
void print_output(int score, char grade)
{
void print_header()
{
cout << score grade
<< ------ -------;
}
print_header();
cout << score << << grade;
}
a.
b.
c.
d.
e.
The variable score should be a double, not an int.
A function call cannot appear inside the body of a function definition.
A function definition cannot appear inside the body of another function definition.
The function does not have a return statement.
None of the above.
12. If you need a function to get both the number of items and the cost per item from a user, which
would be a good function declaration to use?
a.
b.
c.
d.
int,float getData();
void getData(int& count, double& cost);
int getData(double cost);
void getData(int count, double cost);
13. Given the function definition
void something ( int a, int& b )
{
int c;
c = a + 3;
a = a * 2;
b = c + a;
}
What is the output of the following code fragment that invokes the function something?
(All variables are of type int.)
r = 1;
s = 2;
t = 3;
something(t, s);
cout << r << << s << << t << endl;
a.
b.
c.
d.
e.
1 12 3
129
6 12 6
1 12 6
none of the above
14. What is the best choice for a function header for the following function definition?
?(function header goes here)
{
cout << x = << x << endl
<< y = << y << endl;
return;
}
a.
b.
c.
d.
int print_output(int x, int y)
int print_output(int& x, int& y)
void print_output(int x, int y)
void print_output(int& x, int& y)
15. What is the best choice for a function header for the following function definition?
?(function header goes here)
{
return ( (12 * feet) + inches);
}
a. void total_inches(int feet, int inches)
b. void total_inches(int& feet, int& inches)
c. double total_inches(int feet, int inches)
d. double total_inches(int& feet, int& inches)
16. Call-by-reference should be used
a. For all variables
b. Never
c. When the function needs to change the value of one or more arguments
d. Only in void functions
17. A simplified version of a function which is used to test the main program is called
a. Abstraction
b. Polymorphism
c. A driver
d. A stub
18. A simplified main program used to test functions is called
a. Abstraction
b. Polymorphism
c. A driver
d. A stub
19. Which statement correctly opens an input stream named fin and attaches it to a file named
data_in.txt?
a. fin.open(data_in.txt);
b. fin.open("data_in.txt");
c. fin = data_in.txt
d. fin = "data_in.txt"
20. What is the output of the following code fragment assuming fin is an ifstream object that has
been connected to the file in.txt correctly?
in.txt
a.
b.
c.
d.
int next, num_items, sum = 0;
fin >> num_items;
while (fin >> next)
{
sum += next;
}
cout << sum = << sum;
cout << avg = << (sum / num_items) << endl;
sum = 32 avg = 4
sum = 25 avg = 3
sum = 7 avg = 1
sum = 0 avg = 0
73
17
12
47
21. What is the output of the following code fragment assuming fin is an ifstream object successfully
connected to the file, input.txt.
char next;
input.txt
int count = 0;
while (fin >> next)
01234
{
56789
if (next == \n)
10 11 12
{
break;
}
else ((count if % 2) == 0)
{
cout << next;
}
count++;
}
a. 024
b. 01234
c. 024681012
d. 02468111
e. none of the above
22. The following code fragment counts the total number of characters in a file. Fill in the missing
line of code that is needed to accomplish this. You can assume that fin is an ifstream object that
has been successfully connected to an input file.
char ch;
int num_char = 0;
fin.get(ch);
// What goes here?
{
num_char++;
fin.get(ch);
}
a. while( !(fin.eof) )
b. if ( !(fin.eof) )
c. if (fin >> ch)
d. while (fin >> ch)
e. none of the above
23. Suppose ob1 is an object, mem1 is a member function of the object ob1, and mem1 takes one
argument of type int. Which of the following is a correct call to the member function mem1 of
the object ob1 using the argument 7.
a. mem1.ob1(7);
b. ob1.mem1 = 7;
c. mem1.ob1 = 7;
d. ob1.mem1(7);
e. ob1.mem1() = 7;
24. Given the following structure type definition and declarations, what is the type of auto1.model_year?
struct AutoType
{
int model_year;
double price;
};
AutoType auto1;
AutoType auto2;
a. AutoType
b. auto1
c. struct
d. int
e. double
25. Given the same structure type definition and declarations as the previous question, what is the
type of auto1?
a. AutoType
b. auto1
c. struct
d. int
e. double
26. Given the structure type definition and declarations from question 24, which statement is not
valid?
a. auto1.model_year = 1999;
b. AutoType.price = 10.50;
c. double cost = auto1.price;
d. auto1 = auto2;
e. auto1.price = auto2.price;
27. Given the following structure type definitions and declarations, which statement would print to
the screen the students letter grade assuming all member variables have been initialized?
struct Grade
{
int midterm;
int final;
char letter_grade;
};
struct Student
{
int id;
Grade scores;
double gpa;
};
Student student1;
a. cout << student1.letter_grade;
b. cout << student1.scores;
c. cout << scores.letter_grade;
d. cout << student1.scores.letter_grade;
e. cout << student1.Grade.letter_grade;
28. Which of the following are equivalent to (!(x <= 15 && y > 3))?
a.
(x >15 && y <= 3)
b. (x >= 15 && y < 3)
c. (x >= 15 || y < 3)
d. (x > 15 || y <= 3)
e. C and D
29. Given the following function definition, which function call would return a value of true to
the bool variable, my_bool?
bool my_func(int n3, int n2, int n1)
{
return ((n3 <= n2) && (n2 <= n1));
}
a. my_bool = my_func(3,1,2);
b. my_bool = my_func(2,3,1);
c. my_bool = my_func(1,2,3);
d. my_bool = my_func(3,2,1);
e. None of the above
30. The following code fragment changes any lower case letter grade to an upper case letter
grade. Otherwise it should do nothing. There is a problem with the code, however. What is
it?
switch(grade)
{
case a:
grade = A;
break;
case b:
grade = B;
break;
case c:
grade = C;
break;
case d:
grade = D;
case f:
grade = F;
a.
b.
c.
d.
}
There is no default statement.
Missing a break statement.
Cannot use char type variables with switch statements.
Missing a semicolon.
31. What would be the output of the following code fragment?
for (int i = 1; i < 10; i = i + 3)
{
cout << i << ;
}
cout << i;
a. 1 2 3 4 5 6 7 8 9
b. 1 2 3 4 5 6 7 8 9 10
c. 1 4 7
d. 1 4 7 10
e. 1 4 7 10 13 16 . infinite loop
32. Which of the following statements would correctly initialize the entire array declared below?
int array[10];
a.
for (int i = 1; i <= 10; i = i + 1)
array[i] = 0;
b.
for (int i = 0; i <= 10; i = i + 1)
array[i] = 0;
c.
for (int i = 1; i < 10; i = i + 1)
array[i] = 0;
d.
for (int i = 0; i < 10; i = i + 1)
array[i] = 0;
33. For the array declared below, which statement correctly assigns the value 5 to one element of
the array?
double score[5];
a. score = 5.0;
b. score[0] = 5;
c. score(2) = 5.0;
d. score[5] = 5.0;
34. What is the output of the following code?
double a[4] = {1.1, 2.2, 3.3, 4.4};
cout << a[0] << << a[1] << << a[2] << << a[3] << endl;
a[2] = a[3];
cout << a[0] << << a[1] << << a[2] << << a[3] << endl;
a. 1.1 2.2 3.3 4.4
1.1 2.2 2.2 4.4
b. 1.1 2.2 3.3 4.4
1.1 3.3 3.3 4.4
c. 1.1 2.2 3.3 4.4
1.1 2.2 4.4 4.4
d. 1.1 2.2 3.3 4.4
1.1 2.2 3.3 4.4
e. none of the above
35. Why should you use a named constant for the size of an array?
a. Readability of code
b. Makes changes to the program easier
c. Helps reduce logic errors
d. All of the above
36. What is wrong with the following code fragment?
const int SIZE =5;
double scores[SIZE];
for(int i=0; i<=SIZE;i++)
{
cout << "Enter a score\n";
cin >> scores[i];
}
a. Should be cin >> scores[0];
b. Array indices start at 1 not 0
c. Arrays must be integers
d. Array indices must be less than the size of the array
37. What is the best choice for a function header for the following function definition?
?(function header goes here)
{
for (int i = 0; i < size 1; i = i + 1)
{
if (array[i] > array[i + 1])
{
return (i +1);
}
}
return -1;
}
a. int out_of_order(double array[])
b. int out_of_order(double array, int size)
c. int out_of_order(double array[], int size)
d. int out_of_order(double array[size])
38. Which of the following is a correct call to the function out_of_order from the previous
question, given the following declarations?
double a[5];
int element;
a.
b.
c.
d.
element = out_of_order(a[], 4);
element = out_of_order(a, 4);
element = out_of_order(a[], 5);
element = out_of_order(a, 5);