Question

QUESTION 1

1. Given two double variables named x and y, which of the following statements could you use to initialize both variables to a value of 0.0?

   	a.	x | y = 0.0;
   	b.	x = y = 0.0;
   	c.	x, y = 0.0;
   	d.	none of the above

1 points   

QUESTION 2

1. When you use a range-based for loop with a vector, you

   	a.	can avoid out of bounds access
   	b.	must still use a counter variable
   	c.	can process a specified range of elements
   	d.	must still use the subscript operator

1 points   

QUESTION 3

1. Which of the following statements would you use to creat a vector of ints named ages with an initial size of 20 elements?

   	a.	vector<ages> int(20);
   	b.	vector<20> ages(int);
   	c.	vector<20> int(ages);
   	d.	vector<int> ages(20);

1 points   

QUESTION 4

1. Which of the following statements could you use to assign a value to the first element of a vector of doubles named wages?

   	a.	wages<1> = 258.25;
   	b.	wages[1] = 258.25;
   	c.	wages<0> = 258.25;
   	d.	wages[0] = 258.25;

1 points   

QUESTION 5

1. Which of the following statements is not true about a string?

   	a.	With C++98 and later, you can use the string class of the C++ standard library to work with strings.
   	b.	You can use the subscript operator to access the individual characters of a string.
   	c.	You can use a ranged-based for loop to work with the characters in a string.
   	d.	If you compare one string with another string, the default comparison is case-insensitive.

1 points   

QUESTION 6

1. Which of the following is a difference between the float and double data types?

   	a.	float contains a floating-point number and double contains a decimal number
   	b.	float can have up to 7 significant digits and double can have up to 16
   	c.	float numbers are expressed using scientific notation and double numbers are expressed using fixed-point notation
   	d.	float can provide only for positive numbers and double can provide for both positive and negative

1 points   

QUESTION 7

1. Which of these names follows the naming conventions for constants presented in this chapter?

   	a.	WeeksInYear
   	b.	WEEKS_IN_YEAR
   	c.	Weeks_In_Year
   	d.	weeks_in_year

1 points   

QUESTION 8

1. What is the value of the variable named password after the following code is executed?
   
   string password = "openSesame";
   password[0] = toupper(password[0]);
   for (int i = 1; i < password.size(); ++i) {
       password[i] = tolower(password[i]);
   }
   password.push_back('!');

   	a.	Opensesame!
   	b.	Opensesame
   	c.	opensesame
   	d.	opensesame!

1 points   

QUESTION 9

1. What is the value of the variable named street after the following code is executed?
   string address = "123 Main St., Somewhere, CA 93299";
   string street = "";
   int index1 = address.find('.');
   int index2 = address.find(',');
   if (index1 > -1 && index2 > -1) {
       if (index1 < index2) {
           street = address.substr(0, index1);
       }
       else {
           street = address.substr(0, index2);
       }
   }

   	a.	"123 Main St."
   	b.	"123 Main St"
   	c.	""
   	d.	"123 Main St.,"

1 points   

QUESTION 10

1. If the result of an arithmetic expression is assigned to a variable with a type that could cause a loss of data when the conversion is performed, you should

   	a.	explicitly cast the data so an error doesn’t occur at runtime
   	b.	modify the code so it uses a data type that won’t cause a loss of data
   	c.	add code that checks for any errors that may be caused by the conversion
   	d.	explicitly cast the data to indicate that you intend to perform the conversion

Answer 1

QUESTION 1) c

// Screenshot of the code

// Sample output

// code to copy

#include <iostream>
using namespace std;

int main() {
   double x,y=0.0;
   cout<<"x:"<<x<<" y:"<<y;   
   return 0;
}

QUESTION 2) c

Explanation:

can process a specified range of elements

example:  

for(int i=0; i < vector.size(); i++){
   vector[i].doSomething();
}

QUESTION 3) d

Explanation:

vector<int> ages(20);

QUESTION 4) d

// Screenshot of the code

// Sample output

// code to copy

#include <iostream>
#include <vector>
using namespace std;

int main() {
vector<int> wages(20);
   wages[0] = 258.25;
   cout<<wages[0];   
   return 0;
}

QUESTION 5) a

Explanation:

With C++98 and later, you can use the string class of the C++ standard library to work with strings.

QUESTION 6) b

Explanation:

float can have up to 7 significant digits and double can have up to 16

QUESTION 7) b

Explanation:

Constants are declared in capital letters and underscores as WEEKS_IN_YEAR.

QUESTION 8 ) a

// Screenshot of the code

// Sample output

// code to copy

#include <iostream>
using namespace std;

int main() {
   string password = "openSesame";
   password[0] = toupper(password[0]);
   for (int i = 1; i < password.size(); ++i) {
   password[i] = tolower(password[i]);
   }
   password.push_back('!');
   cout<<password;
   return 0;
}

QUESTION 9 ) b

// Screenshot of the code

// Sample output

// code to copy

#include <iostream>
using namespace std;

int main() {
   string address = "123 Main St., Somewhere, CA 93299";
   string street = "";
   int index1 = address.find('.');
   int index2 = address.find(',');
   if (index1 > -1 && index2 > -1) {
   if (index1 < index2) {
   street = address.substr(0, index1);
   }
   else {
   street = address.substr(0, index2);
   }
}
cout<<street;
   return 0;
}

QUESTION 10 ) d

Explanation:

explicitly cast the data to indicate that you intend to perform the conversion