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In class quizzes
75
Chemical Engineering
Undergraduate 2
03/18/2012
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Term
How are variables passed as input to a function?
 Definition
By using arguments
Term
What is the error in the following function definition?

int tripler(int num_para)
{
double result = num_para * 3;
}
 Definition
The function does not return a value.
Term
What is the output of the following code snippet? #include using namespace std; int pow(int base, int power) { int result = 1; for (int i = 0; i < power; i++) { result = result * base; } return result; } int main() { cout << pow(pow(2, 2), 2) << endl; return 0; }
 Definition
16
Term
The purpose of a function that returns “void” is
 Definition
To package a repeated task as a function even though the task does not yield a value
Term
The ceil function in the C++ standard library takes a single value x and returns the smallest integer that is greater than or equal to x. Which of the following is true about ceil(12.6)?
 Definition
The argument is 12.6, and the return value is 13.
Term
What is the output of the following code snippet? #include using namespace std; void prevnext(int a, int& prv, int nxt) { prv = a - 1; nxt = a + 1; } int main() { int a = 100; int b = 0; int c = 0; prevnext(a, b, c); cout << "Previous = " << b << ", Next = " << c; return 0; }
 Definition
Previous = 99, Next = 0
Term
What is the output of the following code snippet? #include using namespace std; void double_amount(int in_value) { in_value = 2 * in_value; } int main() { int principal_amt = 2000; double_amount(principal_amt); cout << principal_amt << endl; return 0; }
 Definition
2000
Term
A function uses a reference parameter when
 Definition
It is designed to update a variable supplied as an argument
Term
#include using namespace std; void func1() { int i = 0; double b = 0; } void func2() { // empty } int main() { func1(); func2(); return 0; }
 Definition
It can be used only in func1().
Term
It can be used only in func1().
 Definition
The function does not specify a type for the second parameter variable.
Term
What are the values of x and y after executing the given code snippet? #include using namespace std; void mystery(int& a, int& b) { a = b; b = a; } int main() { int x = 10; int y = 11; mystery(x, y); return 0; }
 Definition
x = 11 and y = 11
Term
Consider the function shown below.

int do_it(int x, int y)
{
int val = 0;
if (x < y)
{
val = x + 1;
}
else
{
val = y - 1;
}
// the last statement goes here
}

What should be the last statement of this function?
 Definition
A return statement.
Term
Suppose you need to write a function that calculates the volume of rectangular boxes. Which of the following is the best choice for the declaration of this function?
 Definition
double volume(double w, double h, double l)
Term
#include using namespace std; int my_fun(int perfect) { { int perfect = 0; return ((perfect – 1) * (perfect – 1)); } return perfect; } int main() { for (int i = 0; i < 4; i++) { cout << my_fun(i) << " "; } return 0; }
 Definition
1 1 1 1
Term
The statements that are executed when a function is called are known as:
 Definition
The body of the function
Term
What is incorrect in the following code snippet? #include using namespace std; void display_box(string str) { cout << "--------" << endl; cout << str << endl; cout << "--------" << endl; } int main() { cout << display_box("Hello World"); return 0; }
 Definition
display_box does not return a value; therefore, it cannot be used with cout <<.
Term
How many times will the cout statement execute in the following code snippet?

for (int num2 = 1; num2 <= 3; num2++)
{
for (int num1 = 0; num1 <= 2; num1++)
{
cout << num2 << " " << num1 << endl;
}
}
 Definition
9 times
Term
What will be the output of the following code snippet?

for (int i = 0; i < 6; i++)
{
for (int j = 7; j > i; j--)
{
cout << "+";
}
cout << endl;
}
 Definition
An inverted right triangle with six rows and seven columns of the plus sign. The number of columns decrements by one on completion of one iteration of the inner loop.
Term
Which common error is present in the code below, which is intended to calculate the average value from a sum of numbers?

double total = 0.0;
int n = 0;
double input;
while (cin >> input)
{
total = total + input;
n++;
}
double average = total / n;
 Definition
Division by zero
Term
The code snippet below checks whether a given number is a prime number.

int j = 2;
int result = 0;
int number = 0;
cout << "Please enter a number: ";
cin >> number;
while (j <= number / 2)
{
if (number % j == 0)
{
result = 1;
}
j++;
}
if (result == 1)
{
cout << "Number: " << number << " is Not Prime! ";
}
else
{
cout << "Number: " << number << " is Prime! ";
}

What will be the result of executing this code snippet?
 Definition
The code snippet will display the desired result without errors
Term
What will be the final output of the following code snippet when a user enters input values in the order 10, 20, 30, 40, 50, and -1?

double sum = 0;
int count = 0;
double salary = 0;
double average = 0;
cout << "Enter salaries (-1 to stop): " << endl;
while (salary != -1)
{
cin >> salary;
if (salary != -1)
{
sum = sum + salary;
count++;
}
}
if (count > 0)
{
average = sum / count;
cout << "The Average Salary: " << average << endl;
}
else
{
cout << "No data!" << endl;
}
 Definition
The Average Salary: 30
Term
What is the output of the code snippet given below?

string s = "12345";
int i = 1;
do
{
if (i > 1)
{
cout << s.substr (i, 1);
}
}
while (i < 5);
 Definition
No output (Infinite loop)
Term
What is the output of the code fragment given below?

int i = 0, j = 0;
while (i < 125)
{
i = i + 2;
j++;
}
cout << j << endl;
 Definition
63
Term
Is the following code snippet legal?

bool i = false;
do
{
cout << "What do you C?" << endl;
}
while (i != i);
 Definition
Yes, it is legal and prints "What do you C?" once.
Term
What is the output of the code snippet given below?

string s = "abcde";
int i = 1;
while (i < 5)
{
cout << s.substr (i, 1);
i++;
}
 Definition
bcde
Term
What will be the output of the following code snippet?

int i;
int j;
for (i = 0; i < 7; i++)
{
for (j = 7; j > i; j--)
{
cout << "+";
}
cout << endl;
}
 Definition
An inverted right triangle with seven rows and seven columns of the plus sign. The number of columns decrements by one on completion of one iteration of the inner loop.
Term
What is the output of the code snippet given below?

string s = "12345";
int i = 1;
while (i < 5)
{
cout << s.substr (i, 1);
i++;
}
 Definition
2345
Term
The Monte Carlo method can find solutions to problems that are difficult to solve precisely. A typical example of such a problem is
 Definition
The approximation of the value of pi
Term
What will be the result of running the following code fragment?

int time = 0;
int year = 0;
int rate = 0;
int principal = 1000;
int interest = 0;
while (year < 10)
{
interest = (principal * time * rate) / 100;
cout << interest << endl;
}
 Definition
The code fragment will continue to display the calculated interest because the loop will never end.
Term
What is the output of the following code snippet?

int i = 1;
while (i < 10)
{
cout << i << " ";
i = i + 2;
if (i == 5)
{
i = 9;
}
}
 Definition
1 3 9
Term
How many times does the loop run in the following code fragment?

for (int i = 0; i < 60; i = i + 4)
{
cout << i << endl;
}
 Definition
15
Term
Assuming that a user enters 64 as his score, what is the output of the following code snippet?

cout << "Enter your score: ";
int score;
cin >> score;

if (score < 40)
{
cout << "F" << endl;
}
else if (score >= 40 || score < 50)
{
cout << "D" << endl;
}
else if (score >= 50 || score < 60)
{
cout << "C" << endl;
}
else if (score >= 60 || score < 70)
{
cout << "B" << endl;
}
else if (score >= 70 || score < 80)
{
cout << "B+" << endl;
}
else
{
cout << "A" << endl;
}
 Definition
D
Term
Assuming that a user enters 68 as his score, what is the output of the following code snippet?

int score = 0;
cout << "Enter your score: ";
cin >> score;

if (score < 50)
{
cout << "F" << endl;
}
else if (score >= 50 || score < 55)
{
cout << "D" << endl;
}
else if (score >= 55 || score < 65)
{
cout << "C" << endl;
}
else if (score >= 65 || score < 75)
{
cout << "B" << endl;
}
else if (score >= 75 || score < 80)
{
cout << "B+" << endl;
}
else
{
cout << "A" << endl;
}
 Definition
D
Term
What is the output of the following code snippet if the input is 25?

cout << "Please enter a number: ";
int i;
cin >> i;

if (i > 25)
{
i++;
}
else
{
i--;
}
cout << i << endl;
 Definition
24
Term
What is the output of the following code snippet?

int num = 100;
if (num < 100)
{
if (num < 50)
{
num = num - 5;
}
else
{
num = num – 10;
}
}
else
{
if (num > 150)
{
num = num + 5;
}
else
{
num = num + 10;
}
}
cout << num << endl;
 Definition
110
Term
Assuming that the user inputs "twenty" as the input, what is the output of the following code snippet?

cout << "Please enter your age: ";
int age;
cin >> age;

if (cin.fail())
{
cout << "Invalid Data!" << endl;
return 0;
}
if (age < 18)
{
cout << "You are not eligible to vote!";
return 0;
}
else
{
cout << "You are a valid voter!" << endl;
if (age > 60)
{
cout << "You are a senior voter!" << endl;
}
else
{
cout << "You are not a senior voter!" << endl;
}
}
 Definition
Invalid Data!
Term
Consider the following code snippet. Assuming that the user inputs 75 as the age, what is the output?

cout << "Please enter your age: ";
int age;
cin >> age;

if (age < 10)
{
cout << "Child ";
}
if (age < 30)
{
cout << "Young adult ";
}
if (age < 70)
{
cout << "Old ";
}
if (age < 100)
{
cout << "Impressively old ";
}
 Definition
Impressively old
Term
Consider the following code snippet:

cout << "Enter number: ";
int number;
cin >> number;

if (number > 30)
{
..........
}
else if (number > 20)
{
..........
}
else if (number > 10)
{
..........
}
else
{
..........
}

Assuming that the user input is 40, which of the following block of statements is executed?
 Definition
if (number > 30) { .......... }
Term
Consider the following code snippet. Assuming that the user enters 20 and 12 as the two input values, what is the output of the code snippet?

int num1, num2, num3 = 0, num4 = 0, num5 = 0;

cout << "Enter two numbers: ";
cin >> num1 >> num2;

if (num1 < num2)
{
num3 = num1;
}
else
{
num3 = num2;
}
if (num1 < num2 + 10)
{
num4 = num1;
}
else if (num1 < num2 + 20)
{
num5 = num1;
}

cout << "num1 = " << num1 << " num2 = " << num2
<< " num3 = " << num3 << " num4 = " << num4
<< " num5 = " << num5 << endl;
 Definition
num1 = 20 num2 = 12 num3 = 12 num4 = 20 num5 = 0
Term
In a switch statement, if a break statement is missing
 Definition
Execution falls through the next branch until a break statement is reached
Term
Assuming that a user enters 25 as input, what is the output of the following code snippet?

cout << "Please enter a number: ";
int age;
cin >> age;

if (age > 30)
{
cout << "You are wise!" << endl;
}
else
{
cout << "You have much to learn!" << endl;
}
 Definition
You have much to learn!
Term
What is the conditional required to check to see if the length of a string s1 is odd?
 Definition
if ((s1.length() % 2) != 0)
Term
Assuming that a user enters 25 as the value for x, what is the output of the following code snippet?

cout << "Enter number: ";
int x;
cin >> x;

if (x < 100)
{
x = x + 5;
}
if (x < 500)
{
x = x - 2;
}
if (x > 10)
{
x++;
}
else
{
x--;
}
cout << x << endl;
 Definition
29
Term
What is the output of the following code snippet?

double salary = 55000;
double cut_off = 65000;
double min_salary = 40000;

if (min_salary > salary)
{
cout << "Minimum salary requirement is not met." << endl;
}
if (cut_off < salary)
{
cout << "Maximum salary limit is exceeded." << endl;
}
else
{
cout << "Salary requirement is met." << endl;
}
 Definition
Salary requirement is met.
Term
Assuming that the user provides 303 as input, what is the output of the following code snippet?

int x = 0;
cout << "Please enter y: ";
int y;
cin >> y;

if (y > 300)
{
x = y;
}
else
{
x = 0;
}
cout << "x: " << x << endl;
 Definition
x: 303
Term
Assuming that a user enters 50, 70, and 60 as input values one after another, separated by spaces, what is the output of the following code snippet?

int number1;
int number2;
int number3 = 0;

cout << "Enter a digit ";
cin >> number1;

cout << "Enter a digit: ";
cin >> number2;

cout << "Enter a digit: ";
cin >> number3;

if (number1 > number2)
{
if (number1 > number3)
{
cout << number1 << endl;
}
else
{
cout << number3 << endl;
}
}
else
{
if (number2 > number3)
{
cout << number2 << endl;
}
else
{
cout << number3 << endl;
}
}
 Definition
70
Term
Assuming that the user provides 101 as input, what is the output of the following code snippet?

cout << "Please enter b: ";
int a, b;
cin >> b;

if (b > 100)
{
a = b;
}
else
{
a = 0;
}
cout << "a: " << a << endl;
 Definition
a: 101
Term
Assuming that a user enters 56 as his age, what is the output of the following code snippet?

cout << "Enter your age: ";
int age;
cin >> age;

if (age < 13)
{
cout << "Kid!" << endl;
}
if (age >= 13 && age < 19)
{
cout << "Teen!" << endl;
}
if (age >= 19 && age < 30)
{
cout << "Young!" << endl;
}
if (age >= 30 && age < 50)
{
cout << "Adult!" << endl;
}
if (age >= 50)
{
cout << "Old!" << endl;
}
 Definition
Old!
Term
Assuming that a user enters 64 as his golf score, what is the output of the following code snippet?

int golf_score = 0;
cout << "Enter your golf score: ";
cin >> golf_score;

if (golf_score < 60)
{
cout << "Astounding!" << endl;
}
if (golf_score >= 60 && golf_score < 70)
{
cout << "Professional!" << endl;
}
if (golf_score >= 70 && golf_score < 80)
{
cout << "Pretty good!" << endl;
}
if (golf_score >= 80 && golf_score < 90)
{
cout << "Not so hot!" << endl;
}
if (golf_score >= 90)
{
cout << "Keep your day job!" << endl;
}
 Definition
Professional!
Term
What are the values of num1 and num2 after this snippet executes?

double num1 = 4.20;
double num2 = num1 * 10 + 5.0;
 Definition
num1 = 4.20 and num2 = 47.0
Term
In an airline reservation system, the number of available seats in an airplane is required. Which data type should be used to store this value?
 Definition
int
Term
What is the value inside the var variable at the end of the given code snippet? #include using namespace std; int main() { int var = 30; var = var + 2 / var; var++; return 0; }
 Definition
31
Term
What is the output of the following code snippet if the user provides NEW YORK as the input? #include #include using namespace std; int main() { string name; cout << "ENTER THE STRING: "; cin >> name; int s1 = name.length(); cout << s1 << endl; return 0; }
 Definition
3
Term
What is the output of the following code snippet? #include #include using namespace std; int main() { int var1 = 10; int var2 = 2; int var3 = 20; var3 = var3 / (var1 % var2); cout << var3 << endl; return 0; }
 Definition
There will be no output due to a run-time error.
Term
Assuming that the user enters 45 and 62 as inputs for n1 and n2, respectively, what is the output of the following code snippet? #include #include using namespace std; int main() { cout << "Enter a number: "; string n1; cin >> n1; cout << "Enter another number: "; string n2; cin >> n2; string result = n1 + n2; cout << result << endl; return 0; }
 Definition
4562
Term
What is the correct way to invoke functions on variables in C++ that are strings?
 Definition
Invoke them using the variable name and the dot (.) notation
Term
Which of the following choices is a valid statement about this code snippet? #include using namespace std; int main() { double d = 45.326; double r = d % 9.0; cout << r; return 0; }
 Definition
The assignment statement for variable r is wrong, because the % operator expects integer values as operands
Term
Assuming that the user inputs a value of 25 for the price and 10 for the discount rate in the following code snippet, what is the output? #include using namespace std; int main() { cout << "Enter the price: "; double price; cin >> price; cout << "Enter the discount rate: "; double discount; cin >> discount; cout << "The new price is " << price - price * (discount / 100.0) << endl; return 0; }
 Definition
The new price is 22.5
Term
Which one of the following operators computes the remainder of an integer division?
 Definition
%
Term
Consider the following code snippet:

cout << "Please enter a number: ";
int num1;
cin >> num1;
cout << "Please enter another number: ";
int num2;
cin >> num2;
cout << "The product is " << num1 * num2 << endl;

Suppose the student provides the answer 2 5 [Enter] as input to the first prompt. What will the program do?
 Definition
Print "The product is 10"
Term
Which is the appropriate time to initialize a variable?
 Definition
When you define it
Term
What is the result of the following snippet?

int son_age = 5;
int father_age = son_age * 3 + 5;
 Definition
son_age = 5 and father_age = 20
Term
What is the output of the following code snippet? #include using namespace std; int main() { double a; a = sqrt(9.0) + sqrt(16.0); cout << a << endl; return 0; }
 Definition
7.0
Term
What is wrong with the following code snippet? #include using namespace std; int main() { int width = 10; height = 20.00; cout << "width = " << width << " height = " << height << endl; return 0; }
 Definition
The code snippet uses an undefined variable.
Term
How many integer elements can be stored in the array myarr declared below?
--
int myarr[10][8];
 Definition
80
Term
Consider the following code snippet:
--
int arr[3][3] =
{
{ 1, 2, 3 },
{ 4, 5, 6 }
};
int val = arr[0][2] + arr[2][0];
cout << val;
--
What is the output of the given code snippet on execution?
 Definition
3
Term
Consider the following code snippet:
--
int myarray[] = { 10, 20, 30, 40, 50 };
cout << myarray[2];
cout << myarray[3];
--
What is the output of the code snippet?
 Definition
3040
Term
Consider the following code snippet:
--
const int SIZE = 5;
int data_array[SIZE];
for (int i = 0; i < SIZE; i++)
{
data_array[i] = 2 * (i – 1);
}
--
What value is stored in position 2 of the array?
 Definition
2
Term
Consider the following code snippet:
--
int numarray[2][3] = { { 3, 2, 3 }};
cout << numarray[0][0];
cout << numarray[1][0];
--
What is the output of the given code snippet?
 Definition
30
Term
Consider the following code snippet:
--
for (int cnt = 1; cnt < 3; cnt++)
{
num[cnt] = cnt + 1;
cout << num[cnt];
}
--
What is the output of the given code snippet?
 Definition
23
Term
Consider the following code snippet:
--
int numarray[] = { 1, 2, 3, 4, 5 };
cout << numarray[1];
cout << numarray[4];
--
What is the output of the code snippet?
 Definition
25
Term
What is the valid range of index values for an array of size 10?
 Definition
0 to 9
Term
Consider the following code snippet:
--
int numarray[2][3] = {{8, 7, 6}};
cout << numarray[0][0];
cout << numarray[1][0];
--
What is the output of the given code snippet?
 Definition
80
Term
What should be ensured for calculating the smallest value in a vector?
 Definition
The vector contains at least one element.
Term
Consider the following code snippet:
--
int arr[2][3] =
{
{ 13, 23, 33 },
{ 14, 24, 34 }
};
--
What is the appropriate statement to display the value 24 from the given array?
 Definition
cout << arr[1][1];
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