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Midterm Exam

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Question 1

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What is the output of the following code?

// before’s elements set to: 0, 4, 8, then 12

after.at(0) = before.at(0);

for(i = 1; i < before.size(); ++i) {

   tmp = before.at(i-1) + before.at(i);

   after.at(i) = tmp / 2;

   cout << after.at(i) << ” “;

}Select one:a. 0 4 8 12b. 4 8 12c. 0 2 6 10d. 2 6 10 

Correct

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The correct answer is: 2 6 10

Question 2

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What is the output of the following code?

char myFirstInitial = ‘b’;

switch (myFirstInitial) {

   case ‘a’:

       cout << ‘A’;

   case ‘b’:

       cout << ‘B’;

   case ‘c’:

       cout << ‘C’;

   default  :

       cout << ‘D’;

}Select one:a. BCD 

Correct

b. Bc. BCd. D

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The correct answer is: BCD

Question 3

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Which line of code will cause an error when added to the following program?

int main() {

   const int      numCtry=16;

   vector<string> ctryNames(numCtry);

   vector<int>    ctryMins(numCtry);

   // line of code here

   return 0;

}Select one:a. ctryNames = “Germany”;b. ctryNames.at(0) = ctryMins.at(0);c. ctryNames.at(5) = ctryNames.at(0);d. ctryMins.at(0) = 223; 

Incorrect

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The correct answer is: ctryNames.at(0) = ctryMins.at(0);

Question 4

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What is the output of the following code?

int main() {

   int y = 4;  int z = 7;

   cout << (z % y);

   return 0;

}Select one:a. 1b. 3 

Correct

c. 7d. 28

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The correct answer is: 3

Question 5

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Which of the following defines an array named nums that stores 15 items of type int?Select one:a. int nums[15]; 

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b. int nums[] = 15;c. int nums = [15];d. nums = int[15];

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The correct answer is: int nums[15];

Question 6

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Which expression determines whether x is not negative?Select one:a. !(x > 0)b. !(x >= 1)c. !(x < 0) 

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d. !(x == 0)

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The correct answer is: !(x < 0)

Question 7

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What is the output of the following code?

int main() {

   int i = 10;

   while (i < 100) {

       i = i * 2;

       cout << i << ” “;

   }

   return 0;

}Select one:a. 10 20 40 80 160b. 10 20 40 80c. 20 40 80 

Incorrect

d. 20 40 80 160

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The correct answer is: 20 40 80 160

Question 8

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Which line of code contains a syntax error?int main() {

   double roomTemp; // A)

   string roomName;

   roomTemp = 0.0; // B)

   roomName = ‘living room’; // C)

   // main code

   return 0;

}Select one:a. double roomTemp;b. roomTemp = 0.0;c. roomName = ‘living room’; 

Correct

d. No syntax errors.

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The correct answer is: roomName = ‘living room’;

Question 9

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What is the output of the following code?

int main() {

   int x = 0;  int y = 2;

   while (x == 10) {

       cout << x << ” “;

       x = x * y;

   }

   return 0;

}Select one:a. 0 2 4 6 8 10b. 2 4 6 8 10c. Loop is never entered. No output. 

Correct

d. Infinite loop causes infinite output.

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The correct answer is: Loop is never entered. No output.

Question 10

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What is the output of the following code?

int main() {

   int x = 53;  int y = 0;

   if( x > 31 ) {

       y = 30;

   }

   else {

       y = 10;

   }

   cout << y;

   return 0;

}Select one:a. 30 

Correct

b. 53c. 10d. 0

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The correct answer is: 30

Question 11

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What is the output of the following code assuming the vector nums contains the values: -25, 0, 3, 15, 17, -12, and 0.

cnt = 0;

for(i = 0; i < nums.size() ; ++i) {

   if( nums.at(i) > 0 ) {

       ++cnt;

   }

}

cout << cnt << endl;Select one:a. 0b. 3 

Correct

c. 5d. 7

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The correct answer is: 3

Question 12

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What is a variable in coding?Select one:a. Used to denote a list of statements.b. A row of text.c. Represents a particular memory location. 

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d. Textual representation of a program.

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The correct answer is: Represents a particular memory location.

Question 13

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What is the output of the following code?

int main() {

   double y = 5;

   cout << y / 2.0;

   return 0;

}Select one:a. 0b. 2c. 2.5 

Correct

d. No output. Error in code.

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The correct answer is: 2.5

Question 14

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What is the output of the following code?

int main() {

   int x = 3;

   double y = 2.4;

   y = y + static_cast<double>(x);

   cout << y;

   return 0;

}Select one:a. 2.4b. 5c. 5.4 

Correct

d. No output. Error in code.

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The correct answer is: 5.4

Question 15

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What is the output of the following code?

int main() {

   string cityName = “La Jolla”;

   cityName.push_back(‘!’);

   cout << cityName;

   return 0;

}Select one:a. La Joll!b. !!!!!!!!c. !La Jollad. La Jolla! 

Correct

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The correct answer is: La Jolla!

Question 16

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What is RAM in a computer?Select one:a. The doubling of IC capacity roughly every 18 months.b. Non-volatile storage with slower access.c. Manages programs and interfaces with peripherals.d. Volatile storage with faster access usually located off processor chip. 

Correct

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The correct answer is: Volatile storage with faster access usually located off processor chip.

Question 17

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Convert the binary number 00100111 to decimal:Select one:a. 39 

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b. 38c. 33d. 31

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The correct answer is: 39

Question 18

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What is the output of the following code?

int main() {

   int val = 8;

   val = val + val + 1;

   cout << val;

   return 0;

}Select one:a. 9b. 17 

Correct

c. 16d. 8

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The correct answer is: 17

Question 19

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Which expression determines whether two times x is greater than y?Select one:a. !( (x * 2) > y)b. (x * 2) > y 

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c. !( (x * 2) == y)d. x > (y * 2)

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The correct answer is: (x * 2) > y

Question 20

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What is main in C++?Select one:a. Used to denote a list of statements.b. The starting place of a program. 

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c. Represents a particular memory location.d. Textual representation of a program.

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The correct answer is: The starting place of a program.

Question 21

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Which line of code produces the following output:

Enter an integer:Select one:a. cout << “Enter an integer:”; 

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b. output << “Enter an integer:”;c. cout << ‘Enter an integer:’;d. print << ‘Enter an integer:’;

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The correct answer is: cout << “Enter an integer:”;

Question 22

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Which function takes the log of base ten of float y?Select one:a. log(y);b. log10(y); 

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c. fabs(y);d. ceil(y);

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The correct answer is: log10(y);

Question 23

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Which statement contains a syntax error?

int main () {

   int day;

   cout << “Please enter which day of the month it is: “; // A)

   cin >> day // B)

   cout << “There are “ << 31 – day << “ days left until next month.”; // C)

   return 0;

}Select one:a. cout << “Please enter which day of the month it is: “;b. cin >> day 

Correct

c. cout << “There are “ << 31 – day << “ days left until next month.”;d. No errors.

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The correct answer is: cin >> day

Question 24

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What is the output of the following code?

int main() {

   string cityName = “La Jolla”;

   cout << cityName.at(3);

   return 0;

}Select one:a. ab. (space)c. J 

Correct

d. I

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The correct answer is: J

Question 25

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Which line of code causes an error?

int main() {

   const int N = 5;

   int nums[N] = {3, 4, 1, 6, 4}; // A)

   int i = 0;

   nums.at(0) = -1; // B)

   cout << nums[0] << endl; // C)    

   return 0;

}Select one:a. int nums[N] = {3, 4, 1, 6, 4};b. nums.at(0) = -1; 

Correct

c. cout << nums[0] << endl;d. None of the above.

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The correct answer is: nums.at(0) = -1;

Question 26

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Which of the following defines a vector of integers named nums with 3 elements each initialized to 5?Select one:a. vector<nums> 3(5);b. vector<int> nums = 3(5);c. vector<int> nums(3, 5); 

Correct

d. vector<3> nums(5);

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The correct answer is: vector<int> nums(3, 5);

Question 27

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What is the output of the following code?

int main() {

   int x = 10; int y = 15;

   x = (x > y) ? x : y;   // line 3

   cout << x << endl; // line 4

   return 0;

}Select one:a. 10b. 15 

Correct

c. No output. Error on line 4.d. No output. Error on line 3.

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The correct answer is: 15

Question 28

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What is the output of the following code?

int main() {

   int x = 10;  int y = 20;  int z = 15;

   if (x < 0) {

       z = 0;

   }

   else if (y < 30) {

       z = 10;

   }

   else {

       z = 20;

   }

   cout << z;

   return 0;

}Select one:a. 0b. 10 

Correct

c. 15d. 20

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The correct answer is: 10

Question 29

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Select the statement that completes the following for loop so that the loop iterates over the entire vector v.

vector<int> v(10);

int i = 0;

for (i = 0; /* statement goes here */ ; ++i) {

  v.at(i) = i;

}Select one:a. i <= v.size()b. i < v.size() 

Correct

c. i < size(v)d. i <= 10

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The correct answer is: i < v.size()

Question 30

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Which statement defines a 16-bit unsigned integer variable?Select one:a. short short numSeconds;b. unsigned short numSeconds; 

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c. unsigned int numSeconds;d. short numSeconds;

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The correct answer is: unsigned short numSeconds;

Question 31

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What is the value assigned to variable z for the following code, assuming the initial values of a = 2, b = 2, and c = 30?

mult = 0;

while (a < 20) {

   mult = b * a;

   if (mult > c) break;

   a = a + 1;

}

z = a;Select one:a. 16 

Correct

b. 18c. 30d. 40

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The correct answer is: 16

Question 32

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Which loop will be iterated exactly 5 times?Select one:a. for (i = 1; i < 5; ++i)b. for (i = 0; i <= 5; ++i)c. for (i = 1; i <= 5; ++i) 

Correct

d. for (i = 1; i <= 5; –i)

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The correct answer is: for (i = 1; i <= 5; ++i)

Question 33

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What is a compiler in computing?Select one:a. Translates a high-level language program into low-level machine instructions. 

Correct

b. Another word for program.c. Human-readable processor instructions; an assembler translates to machine instructions (0s and 1s).d. A series of 0s and 1s, stored in memory, that tells a processor to carry out a particular operation like multiplication.

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The correct answer is: Translates a high-level language program into low-level machine instructions.

Question 34

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What is the output of the following code?

int main() {

   char c1 = ‘-‘;  char c2 = ‘-‘;

   c1 = ‘a’;

   while (c1 < ‘c’) {

       c2 = ‘a’;

       while (c2 < ‘d’) {

           cout << c1 << c2 << ” “;

           ++c2;

       }

       ++c1;

   }

   return 0;

}Select one:a. aa ab ac ba bb bc 

Correct

b. aa ab ba bbc. aa ab ac ba bb bc ca cb ccd. aa bb

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The correct answer is: aa ab ac ba bb bc

Question 35

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Given the following, assign the value stored in the fourth column of the first row of an array dataVals to a variable x.

const int rows = 7;
const int cols = 5;
int dataVals[rows][cols];
Select one:a. x = dataVals[3][0];b. x = dataVals[4][1];c. x = dataVals[0][3]; 

Correct

d. x = dataVals[1][4];

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The correct answer is: x = dataVals[0][3];

Question 36

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What is a cache in a computer?Select one:a. The doubling of IC capacity roughly every 18 months.b. Non-volatile storage with slower access.c. Manages programs and interfaces with peripherals.d. Relatively-small volatile storage with fastest access located in processor chip. 

Correct

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The correct answer is: Relatively-small volatile storage with fastest access located in processor chip.

Question 37

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Which expression determines whether x is between 10 and 20, and y is between 0 and 99?Select one:a. ((x < y) || (x > y) && !(y > 99) && (x > 10)b. ((x == 10) || (x == 20)) && ((y == 0) || (y == 99))c. (x > 10) || (x < 20) || (y > 0) || (y < 99)d. (x > 10) && (x < 20) && (y > 0) && (y < 99) 

Correct

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The correct answer is: (x > 10) && (x < 20) && (y > 0) && (y < 99)

Question 38

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What is the output of the following code?

int main() {

   int x = 5;  int y = 6;  int z = 2;

   x = x + y;

   z = x – 2;

   cout << z;

   return 0;

}Select one:a. 2b. 5c. 11d. 9 

Correct

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The correct answer is: 9

Question 39

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What is the output of the following code if the code output 19574 in the previous run?

int main() {

   srand(50);

   cout << rand();

   return 0;

}Select one:a. 19574 

Correct

b. 19575c. 19584d. Cannot determine.

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The correct answer is: 19574

Question 40

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How many total elements are in an array with 4 rows and 3 columns?Select one:a. 4b. 6c. 12 

Correct

d. 16

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The correct answer is: 12

 
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