COMSCI

In an instruction like: z = x + y, the symbols x, y, and z are examples of _____.

variables

What does this code output?


cout << "I ";
cout << "want pie." << endl;

I want pie.

What will a compiler do for the following three lines of code?


// x = 2; // width
// y = 0.5
// z = x * y; Total area

Ignore all three lines

C++ is _____.

derived from C

Which is not a component of a computer?

Programmer

Which item converts a high-level language program to low-level machine instructions?

Compiler

If a program compiles without errors, the program is free from _____.

syntax errors

A program should compute two times x. Which statement has a logic error?

y = x * x;

Choose the statement(s) that generate(s) this output:
I wish
you were here

What will a compiler do for the following code?


/*
numItems = 2; /* Total items to buy */
rate = 0.5;
*/

Generate an error.

Which one of the following would be an illegal variable name?

3rdQuartile

What will the value of x be after the following statements execute?
int x;
x = 11 % 5;

1

What will the following code display?
cout << "Monday";
cout << "Tuesday";
cout << "Wednesday";

MondayTuesdayWednesday

What is the value of an integer variable "y" after the following statement?
y= 44/33;

1

What is the output of the following statement?
cout << 4 * (15 / (1 + 3)) << endl;

12

Assume that a program has the following string object definition: string name;

Which of the following statements correctly assigns a string literal to the string object?

name = "Jane";

Which yields 3.4?

static_castdouble(17) / static_castdouble(5)

Which statement will read an entire line of input into the following string object? string address;

getline(cin, address);

Convert the decimal number 24 to an 8-bit binary number.

00011000

What is the output of the following program fragment?age = 29;cout << "Are you" << age << "years old?" << endl;

Are you29years old?

Which of the following choice represents a correct logical expression (right part after "=>") of the described condition (left part before "=>")?

userNum is neither 5 nor 10 =!( (userNum == 5) || (userNum == 10) )

Given numPeople = 10, numCars = 2, userKey = 'q'. Which choice is false?

(numPeople = 10) (numCars 2)

According to code like this, when userChar = 'E', which value of variable "encodedVal" is correct?
switch (userChar) { case 'A': encodedVal = 1; break; case 'B': encodedVal = 2; break; case 'C': case 'D': encodedVal = 4; break; case 'E': encodedVal = 5; case 'F': encodedVal = 6; break; default: encodedVal = -1; break; }

6

What is the output of the following code?

int w = 98;

int x = 99;

int y = 0;

int z = 1;

if (x >= 99){ if (x < 99){ cout << y << endl; }

else { cout << z << endl; }}

else { if (x==99){ cout << x << endl; }

else { cout << w << endl; }}

1

Without this statement appearing in a switch construct, the program "falls through" all of the statements below the one with the matching case expression.

break

Which value can be entered to cause the following code segment to display the message: "That number is acceptable."

int number;

cin >> number;

if (number > 10 && number < 100) { cout << "That number is acceptable" << endl;}

else { cout << "That number is not acceptable" << endl;}

99

Which statement allows you to properly check the char variable code to determine whether it is equal to a "C" and then output "This is a check" and then advance to a new line?

if (code == 'C') { cout "This is a check" endl;}

Which of the following expressions will determine whether x is less than or equal to y?

x <= y

Which choice is not correct according to code like this:
int csci40Score;
if (csci40Score

3rd branch range is [69, 84];

Which of the following statement is required for calling function "sqrt()"?

include cmath

How many times will the following loop display "Hello!"?
for (i=1; i

19

How many times will the following loop display "Hello!"?
for (i = 0; i <= 20; ++i){ cout << "Hello!" << endl; }

21

This is a variable that is regularly incremented or decremented each time a loop iterates.

counter

This statement causes a loop to terminate early.

break

What is the output of this code:

string x = "One";

string y = "Two";

string temp;

temp = y + x;

cout << temp << endl;

TwoOne

Complete the for loop to achieve the goal.
Iterate for i from 0 to 30 by 5s (0, 5, 10, 15, ...).
for (i=0; i

i=i+5

Complete the for loop to achieve the goal.
Iterate for i from 10 down to 0. Compare with 0.
for (i=10; ___________________ ; --i ) { // Loop body}

i=0;

How many times will the loop body execute?
Assume user would enter 'a', then 'b', then 'n'.

// Get userChar from user here while (userChar != 'n') { // Do something //Get userChar from user here }

Loops 2 times

How many times will the loop body execute?
Assume user would enter 'n', then 'n', then 'y'.

// Get userChar from user here while (userChar != 'n') { // Do something // Get userChar from user here }

0

What will the following code output? (For an infinite loop, type "IL")
int x = 5; int y = 18; while (y >= x) { cout << y << " "; y = y - x; }

18 13 8

Which input value causes "Goodbye" to be output next?

int x;

cin >> x;

while (x <= 0) { // Do something cin >> x;}

cout << "Goodbye";

1

What is the ending value of sum, if the input is 2 3 7 5? All variables are ints.
cin >> x;

sum = 0;

for (i = 0; i < x; ++i) { cin >> currValue; sum += currValue;}

10

A loop should output 1 to n. If n is 5, the output is 12345. What should XXX and YYY be? Choices are in the form XXX / YYY.

cin >> n;

for (XXX; i++) { cout << YYY;}

i = 0; i = n / i + 1

What is the output if count is 4?
for (i = count; i >= 0; --i) { // Output count cout << i;}

43210

What is the output?
int n;for (n = 0; n < 10; n = n + 3) { cout << n << " ";}

0 3 6 9

The program should determine the largest integer seen. What should XXX be, if the input values are any integers (negative and non-negative)? All variables are ints and have unknown initial values.
for (i = 0; i < 10; ++i) { cin >> currValue; if (i == 0) { // First iteration XXX; } else if (currValue > maxSoFar) { maxSoFar = currValue; }}

maxSoFar = currValue

The program should output even values between -10 and 10 (inclusive), so -10 -8 ... 8 10. What should XXX be?
for (XXX) { cout << i << " ";}

i = -10; i = 10; i = i + 2

Which XXX causes every character in string inputWord to be output?
for (XXX) { cout << inputWord.at(i) << endl; }

i = 0; i = inputWord.size(); ++i

Which input value causes the loop body to execute a 2nd time, thus outputting "In loop" again?

string s = "Go";

while ((s != "q") && (s != "Q")){ cout << "In loop" << endl; cin >> s;}

"Quit"

If the input is 12, what is the final value for numItems?
int x;

int numItems = 0;

cin >> x;

if (x <= 12) { numItems = 100;}

else { numItems = 200;}

numItems = numItems + 1;

101

Which input for char c causes "Done" to be output next?
c = 'y';

while (c = 'y') { // Do something cout << "Enter y to continue, n to quit: "; cin >> c;}

cout << "Done";

No such value (infinite loop)

Which expressions for XXX, YYY, and ZZZ output "Great job" for scores above 90, and "Nice try" otherwise? Choices are in the form XXX / YYY / ZZZ.

int score;

cin >> score;

if (XXX) { cout << YYY;}

else { cout << ZZZ;}

score >= 91 / "Nice try" / "Great job"

What is the final value of y?
int x = 77;

int y = 4;

if (x == 77) { y = y + 1;}

if (x < 100) { y = y + 1;}

if (x > 77) { y = y + 1;}

y = y + 1;

7

What is y's ending value?
int x;int y = 0;cin >> x;if (x = 20) { y = 3;}

Always 3 no matter what the input

Which outputs "Negative" for values less than 0, otherwise outputs "Non-negative"?

if (val = 0) { cout "Non-negative";}

else { cout "Negative"; }

Which expressions for YYY and ZZZ correctly output the indicated ranges? Assume int x's value will be 0 or greater. Choices are in the form YYY / ZZZ.
if (YYY) { // Output "0-29"} else if (ZZZ) { // Output "30-39"}else { // Output "40+"}

x < 30 / x < 40

What is the output, if the input is 3 2 1 0?
cin >> x;

while (x > 0) { cout << 2 * x << " ";}

6 6 6 6 6 … (infinite loop)

Which expression for XXX outputs "Modern era" for any year 1980 and later?
if (year < 2000) { // Output "Past"}else if (XXX) { // Output "Modern era"}

(No such expression exists)

A restaurant gives a discount for children under 10. They also give the discount for adults over 55. Which expression evaluates to true if a discount should be given?

(age < 10) || (age > 55)

Which expression evaluates to false if x is 0 and y is 10?

(x == 0) && (y == 20)

To quit, a user types 'q'. To continue, a user types any other key. Which expression evaluates to true if a user should continue?

!(key == 'q')

Which expression for YYY correctly outputs that x is between 50-100?
if (YYY) { // Output "50, 51, ..., 99, 100"}

(x >= 50) && (x

What is the output for x = 15?
switch (x) { case 10: // Output: "First " break; case 20: // Output: "Second " break; default: // Output: "No match " break;}

No match

Which XXX and YYY will loop as long as the input is an integer less than 100? Choices are in the form XXX / YYY.

cin >> w;

while (XXX) { // Do something YYY;}

w < 100 / cin >> w

For what values of x does the default case execute in the code below? x is declared as an integer.
switch (x) { case 2: ... break; case 3: ... break; case 4: ... break; default: ... // When does this execute?}

Only for values that are not 2, 3, or 4

A loop should sum all inputs, stopping when the input is 0. If the input is 2 4 6 0, sum should end with 12. What should XXX, YYY, and ZZZ be? Choices are in the form XXX / YYY / ZZZ.

int sum;

int currVal;

XXX;

cin >> currVal;

while (YYY) { ZZZ; cin >> currVal;}

sum = 0 / currVal != 0 / sum = sum + currVal

How many times does the while loop execute for the given input values of -1 4 0 9?
userNum = 3;

while (userNum > 0) { // Do something // Get userNum from input}

1

What is the output?
int x = 18;while (x > 0) { // Output x and a space x = x / 3; }

18 6 2

Which for loop will iterate 100 times?

for (i = 0; i=100; i++)

What is the output, if the input is 3 2 4 5? All variables are ints.
cin >> num;for (i = 0; i < num; ++i) { cin >> curr; cout << curr;}

245

This vector function returns the number of elements in a vector.

size

What does the following statement do?vector z(10);

It creates avectorobject with a starting size of 10.

Which statement correctly defines a vector object for holding integers?

vectorint v;

What does the following code do with a vector "v" that has N double elements?
double temp = v.at(0);
v.at(0) = v.at(N-1);
v.at(N-1) = temp;

Swap the first and last elements of vector "v"

for (i = 0; _______________________ ;++i){
cout<< daysList.at(i)<< endl;
}
Complete the code to print all items for the given vector:
vector daysList(365);

i 365

________ algorithms are used to arrange random data into some order.

Sorting

Assign the vector's last item's value into the first position. Assume vector scoresList has 10 items.

scoresList.at(0) = scoresList.at(9)

What is the size of the myVector after the following statements:
vector myVector;myVector.push_back(1);myVector.pop_back();myVector.push_back(10);myVector.back();

1

Define an int vector testVctr with 50 elements.

vectorint testVctr(50);

Assume that a vector is defined as follows. What is the correct statement if we want to set the first element to 3?
vector v;

v.push_back(3); to set it to the first element

Given a function definition: void CalcVal(int a, int b, int c)and given int variables i, j, and k, which are valid syntax for the call CalcVal(...)?

CalcVal(k,i+j,99)

Given a function that returns the bigger value of two integers as follows: int max(int x, int y). Which of the following is the incorrect syntax for getting the maximum of three variables a, b, and c?

max(a,b,c)

If itemPrices has element values 45, 48, then after what function, itemPrices' element values are 45,48,38?

itemPrices.push_back(38);

Assume itemPrices initially has elements 45, 22, 38. After "pop_back" function executes, what does "itemPrices.at(2)" return? Select "error" if appropriate.

error

Which of the following is the correct syntax for a function call used to print out the area of a rectangle with sides being values of variables x and y? The function declaration is as follows:
int RectArea(int a, int b);

cout RectArea(x, y);

The size of vector "vctr" can be set or changed while a program is executing using:

vctr.resize(N)

Which correctly declares a function named "PrintDistance" that takes four integer parameters x1, y1, x2, y2? The function does not return any value.

void PrintDistance(int x1, int y1, int x2, int y2);

Assume that table1 is an instance of the Table class, and that the Table class has a member function named addEmptyChair. Which of the following is a valid call to the addEmptyChair member function?

table1.addEmptyChair();

Public members of a class object can be accessed with the ________.

dot operator

This type of member variable may NOT be accessed directly from a statement outside the class.

private

This type of member variable may be accessed only from within a function that is a member of the same class.

private

Which of the following is the correct syntax for accessing a "public" member "GetDist()" of a variable named "runnerInfo" of class "RunnerInfo"?

runnerInfo.GetDist()

Which of the following is the correct syntax for accessing a "private" member "GetDist()" of a variable named "runnerInfo" of class "RunnerInfo"?

There is no way to do this directly

Suppose we have a class named "PointClass" defined. What is the correct syntax for creating an object of PointClass named "point1"?

PointClass point1;

Which of the following is the correct declaration for pass by reference for a function that converts a given time to hours and mins?

void ConvHrMin (int timeVal, int hrVal, int minVal);

Which correctly declares a function named "CalcVal" that takes two integer parameters x and y? The function does not return any value.

void CalcVal(int x, int y);

What code for XXX, YYY correctly swaps a and b? Choices are written as XXX / YYY.


XXX;
a = b;
YYY;
b = tmp;

tmp = a / (nothing)

Which of the following prints out the data from a pointer/memory address, given the following code?
double x = 0.0;
double* p = &x;

cout *p endl;

Assume variable int numStudents = 12 is at memory address 99, and variable int* myPtr is at address 44. What does
cout << &numStudents;
output?

99

Given a pointer variable "sp" pointing to an object of class "Point" with a public member variable "x", which of the following is a correct statement to print the member variable?

cout (*sp).x;