Answered: Language c++: 1. Given string str…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Language c++:

1. Given string str is "Great", which choice has all matching expressions?

Group of answer choices

a. str == "Great"

b. str == "Great", str == "great"

c. str == "Great", str == "Great!"

d. str == "Great", str == "great", str == "Great!"

What is the ending value of userString? (Note the question asks about userString, not about x).

userString = "FaceBook";
x = tolower(userString.at(4));

a. "Facebook"

b. "FaceBook"

c. "Faceook"

d. "b"

3. Which expression evaluates to true if the corresponding characters of strings s1 and s2 are equal independent of case? Ex: "C" and "c" should be considered equal.

Group of answer choices

a. str1.at(i) == str2.at(i)

b. str1.at((tolower(i)) == str2.at(tolower(i))

c. str1.at(i) == toupper(str2.at(i))

d. toupper(str1.at(i)) == toupper(str2.at(i))

4. Given string str1 and string str2, which expression is true?

str1 = "Hi";
str2 = "Hello";

Group of answer choices

a. str1 < str2

b. str1 > str2

c. str1 <= str2

d. (Comparison not possible)

5. Which expression for XXX causes the code to output the strings in alphabetical order? (Assume the strings are lowercase)

if (XXX) {
cout << firstStr << " " << secondStr << endl;
}
else {
cout << secondStr << " " << firstStr << endl;
}

Group of answer choices

a. firstStr == secondStr

b. firstStr < secondStr

c. firstStr > secondStr

d. firstStr != secondStr

6. For the string "on time", what character is at index 3?

Group of answer choices

a. (Space)

b. t

c. i

d. m

7. Given str = "Cat", what is the result of this statement?

str.at(1) = "ab";

Group of answer choices

a. str is "abt"

b. str is "Catab"

c. str is "Cab"

d. Error: Assigning a character with a string is not allowed

8. What is the relation between a string's length and the string's last index?

Group of answer choices

a. lastIndex == length

b. lastIndex == length - 1

c. lastIndex == length + 1

d. lastIndex == length + 2

9. Given string s is "Sunday", what is the ending value of char myChar?

myChar = s.at(s.size() - 1);

Group of answer choices

a. a

b. y

c. "

d. No such character

10. Given userStr = "Doghouse", what is the ending value of char x?

x = tolower(userStr.at(2));

Group of answer choices

a. G

b. g

c. (Space)

d. Error: Compiler complains about converting an already-lowercase letter

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