Question

Question 1

An array is NOT:

A - Made up of different data types.

B - Subscripted by integers.

C - A consecutive group of memory chunks.

D - None of the choices.

Question 2

How many times is the body of the loop executed?

int i=1; 
while(true) { 
   cout << i; 
   if(++i==5) 
      break; 
} 

A - Forever

B - 4

C - 5

D - 6

E - 0

Question 3

What is wrong with the following piece of code fragment?

1 string name;
2 name = “PCC”;
3 switch(name)
4 {
5   case “BCC”: cout << “BCC”;
6       break;
7   case “PCC”: cout <<”PCC”;
8       break;
9 } 

A - Default statement is missing.

B - There is an error in Line 2

C - Strings cannot be used with switch statement.

D - Semi colon is missing at the end of the switch statement.

E - None of the choices.

Question 4

What is stored in the variable name result?

string str1= “John Smith”; 
string str2 = “John Doe”; 
bool result = (str1 < str2); 

A - true

B - false

C - Undefined

D - None of the choices.

E - “John Smith”

F - “John Doe”

Question 5

In a brief sentence describe what is wrong with the following code:

1 int minval(int arr[], int size)
2 { 
3    int localmin; 
4    for (int i=0; i<size; i++) 
5        if (arr[i] < localmin)
6            localmin = arr[i]; 
7    return localmin; 
8 }

Question 6

After the following code snippet is pre-processed, the statement in Line 5 expands to which of the following:

1 # See rand() in http://www.cplusplus.com/reference/cstdlib/rand/
2 #include <cstdlib>
3
4 #define R(n)  random()%n
5 int value = R(j-i+1);

A - int value = rand()%j-i+1;

B - int value = random()%j-i+1;

C - int value = R(j-i+1)%j-i+1;

D - None of the choices.

Question 7

We have the following 2 char arrays with identical character sequences in them. The easiest way to compare if both string buffers have the same content is to check for the result of arr1==arr2.

char arr1[] = {'p', 'c', 'c'};
char arr2[] = {'p', 'c', 'c'};

A - True

B - False

Question 8

We can copy str1 into str2 by the following:

char str1[10] = "PCC";
char str2[10];
strcpy(str1, str2);

A - True

B - False

Question 9

This question may have 0 to multiple answers. Choose all that apply. Examine the following code and identify the Line number(s) where a bug may exist. Bug is defined as the specific location in line number where the flow of execution may either stop or produce undesirable result:

1 char str[4];
2 for (int i=0; i<3; i++)
3  str[i]=getchar();
4 cout << str;

A - Line 2

B - Line 3

C - Line 4

D - None of the choices.

Question 10

The following statement is CORRECT:

char str[3] = "pcc";

A - True

B - False

Question 11

Generally, we write error handlers (namely, functions that are designed to catch input, functional, or output errors) for errors that are caught at compile time.

A - True

B -False

Question 12

This question may have 0 to multiple answers. Choose all that apply. Which of the following is TRUE about a function:

A - Passing lots of arguments into a function is costly compared to alternatives.

B - Having too many function calls in a program slows it down.

C - A function declaration tells the compiler about a function's name, return type, and parameters.

D - A function can return AT MOST 1 value back to its caller.

Question 13

When passing an array into a function as its parameter, we must also pass in the array's size into the function as another parameter.

A - True

B - False

Question 14

This question may have 0 to multiple answers. Choose all that apply. Converting from data type _______ to data type ______ will result in the loss of data.

A - short, long

B - float, double

C - int, char

D - char, bool

E - None of the choices.

Question 15

A data type that can have values ONLY between the range 0 to 65535 is a:

A - 2-byte int

B - 4-byte int

C - 2-byte unsigned int

D - 4-byte unsigned int

Question 16

This question may have 0 to multiple answers. Choose all that apply. Consider the following for loop:

for (int x = 1; x < 5; increment) {
   cout << x + 1 << endl;
}

If the last value printed is 5, which of the following can be used for increment?

A - x++

B - ++x

C - x += 1

D - None of the choices.

E - x--

F - --x

J - x -= 1

Question 17

If a do…while structure is used:

A - Counter-controlled iteration is not possible.

B - An infinite loop cannot take place.

C - An off-by-one error cannot occur.

D - The body of the loop will execute at least once.

E - None of the choices.

Question 18

In C++, the condition  (4 > y > 1):

A - Does not evaluate correctly and should be replaced by (4 > y && y > 1).

B - Evaluates correctly and could be replaced by (4 > y && y > 1).

C - Does not evaluate correctly and should NOT be replaced by (4 > y && y > 1).

D - Evaluates correctly and could NOT be replaced by (4 > y && y > 1).

Question 19

Which of the following initializes a vector<int> with a list initializer:

A - vector integers{1, 2, 3, 4, 5, 6};

B - vector<int> integers(1, 2, 3, 4, 5, 6);

C - vector<int> integers{1, 2, 3, 4, 5, 6};

D - None of the choices.

E - vector<int> integers[1, 2, 3, 4, 5, 6];

Question 20

This question may have 0 to multiple answers. Choose all that apply. Assuming var is an int, and you apply an increment operation on var in a statement:

A - var++ adds 1 to var, returning the new var before the semicolon.

B - ++var adds 1 to var, returning the new var before the semicolon.

C - var++ adds 1 to var, returning the old var before the semicolon.

D - ++var adds 1 to var, returning the old var before the semicolon.

E - None of the choices.

Question 21

This question may have 0 to multiple answers. Choose all that apply. Which of the following is a valid way to retrieve the length of a C++ string, str?

A - str.length();

B - strlen(str);

C - strlen(str.c_str())+1;

D - None of the choices.

E - str.size();

Question 22

An array is a sequence of objects allocated in contiguous memory. That is, all elements of an array can be of different types and there are no gaps between them in the sequence.

A - True

B - False

Question 23

The following statements compile in C++:

int arr[10];
arr[-1] = 1;
arr[10] = 2;

A - True

B - False

Question 24

The support for C-style strings are in <cstring>

A - True

B - False

Question 25

What is the length of the resulting C-style string, str, after strcpy()?  

char str[100];
strcpy(str, "C++");

A - 4

B - 3

C - 100

D - 101

Question 26

C++ style string is terminated by '\0'.

A - True

B - False

Question 27

Assuming str is an non-empty C-style string, is the following True or False?

sizeof(str) == strlen(str);

A - True

B - False

Question 28

If the variable x has the original value of 3.3, what is the output value after the following?

cout << static_cast<int>(x);

A - 3

B - 2

C - 3.3

D - 4

E - undefined

F - 3.0

Question 29

What is the value returned by the following function?

int function()
{
      int value = 30;
      return value + 5;
      value += 10;
}

Question 30

Assert terminates the program with a message when its boolean argument turns out to be TRUE.

A - True

B - False

Question 31

Multiple arguments going into to a function as parameters are separated by a

A - commas ','

B - period '.'

C - semicolons ';'

D - comments

Question 32

The functions pow(), sqrt(), and fabs() are found in which include file?

A - cstdlib

B - stdlib

C - iostream

D - cmath

E - std

Question 33

This question may have 0 to multiple answers. Choose all that apply. How do you concatenate two C++ strings, str1 and str2?

A - concate(str1, str2);

B - strconcate(str1, str2);

C - str1 = str2;

D - str1.add(str2);

E - str1 += str2;

For the remaining questions, use this Problem Description. You are asked to examine an arbitrary C++ string, and generate a list of characters and their occurrences, in ASCII order, from that string.

Example:

For an input string of "P C C?", we can see the repeated characters are ' ', 'C', 'P' and '?' with an empty space occurring 2 times, 'C' occurring 2 times, 'P' occurring 1 time, and '?' occurring 1 time. In ASCII order we have the following, with their count:

 : 2
C: 2
P: 1
?: 1

Question 34

Based on the Problem Description, the input may be the combination of any one of the 128 characters in the ASCII table (Links to an external site.)Links to an external site.. Write a STATEMENT (not the entire program) to create/instantiate an array of 128 characters called arr, either statically or dynamically.

NOTE: if you choose to allocate arr dynamically, please also include a second statement to dynamically deallocate it.

12pt

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Question 352 pts

Based on the Problem Description, we need to keep the character count for every one of the 128 possible characters. Which of the following statements illustrates the use of arr (array created from the last problem) to increment the ASCII_CHARACTER count by 1? ASCII_CHARACTER can be any one of the first 128 characters in the ASCII Table (Links to an external site.)Links to an external site. (not the Extended ASCII Table).

arr[ASCII_CHARACTER-97]++;

arr[ASCII_CHARACTER] = ASCII_CHARACTER++;

arr[ASCII_CHARACTER]++;

arr[ASCII_CHARACTER-65]++;

None of the choices.

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Question 367 pts

Based on the Problem Description and the previous questions, write a short code snippet (not the entire problem) to generate a dictionary of letter occurrences. Namely, print a list of input characters and their occurrences from an arbitrary C++ string, str. You may use cout() to print them to the console. Cut and paste your code snippet into the text box.

Input:

string str = "P C c?";

Output:

Your output is a character list in the ascending ASCII order (namely space ' ' appearing before '?', which appears before 'C' , which appears before 'P'. Finally, the lower case 'c' appears last):

 : 2
?: 1
C: 1
P: 1
c: 1

Constraints/Assumptions:

• Your code should work with any characters in ASCII (i.e., the first 128 characters in the table http://www.asciitable.com (Links to an external site.)Links to an external site.).
• The character must be printed in ascending ASCII order, separated by line break as seen above.
• Only print characters from the input string.

Rubric:

• (2 points) Correct ASCII order (ascending) separated by line break.
• (5 points) Correct letter occurrences.

Answer 1

1) answer A

the elements of array are of same data type

2)answer B

the loop runs for i=1 i=2,i=3,i=4 when i=4 this statement (++i)==5 is true so break statement works and loop is broken

3)answer C

switch statements work only for integers

4)answer B false

s1 < s2 : A string s1 is smaller than s2 string, if either, length of s1 is shorter than s2 or first mismatched character is smaller.

In this example length of John Doe is smaller than John Smith

5)local min is not initialised so it will have garbage value

6)answer B

int value = random()%j-i+1;

7)answer B false

char arrays can not be compared using == because arr1 and arr2 gives the address where the first element of char array is stored

8)False

string can be copied using strcpy(str2,str1) not strcpy(str1,str2)

According to HomeworkLib policy in one question with multiple parts we have to answer minimum 4 parts but i have answered 8 parts

.If you have any doubt in any 8 of these .you can ask in comment section And do positive rate the answer