Question 1

What is the output of the following code?
#include<iostream>
int main()
{
using namespace std;
double a[3] = {1.1,3.3,2.2};
cout << a[0] << " " << a[1] << " " << a[2] << endl;
a[1] = a[2];
cout << a[0] << " " << a[1] << " " << a[2] << endl;
}

Accepted Answer

The answer of What is the output of the following...

Question 2

Explain the error in the following code.You may give the warning message,or error message,your compiler might give for the following error,or you may describe the error.However you present the error,you must explain clearly what is wrong.
#include <iostream>
//Test question
void show_array(int ar[],int size)
{
using namespace std;
for(int i = 0;i < size;i++)
cout << ar[i] << " ";
cout << endl;
}
int main()
{
const int a[6] = {2,4,2,3,5};
show_array(a,6);
//...
}

Accepted Answer

The answer of Explain the error in the following code.You...

Question 3

Here is a list of 8 numbers.Use the selection sort algorithm to sort this list.Fill in this table with each iteration of the loop in the selection sort algorithm.Mark the place from which you are looking for the 'next smallest element'.In this display,the upper numbers are the indices,the lower numbers are in the corresponding positions.Use the several rows provided to show the sequence of steps.

Accepted Answer

The answer of Here is a list of 8 numbers.Use...

Question 4

Consider the declaration
double a[10] = {1.2,2.1,3.3,3.5,4.5,7.9,5.4,
8.7,9.9,1.0};
Write a function named out_of_order that will test this array for the condition
a[0] <= a[1] <= a[2] <= ...
The function returns a -1 if the elements are not out of order,otherwise it returns the index of the first element that is out of order.
Explain what you do to avoid out of bounds array access.

Accepted Answer

The answer of Consider the declaration
double a[10] = {1.2,2.1,3.3,3.5,4.5,7.9,5.4,
8.7,9.9,1.0};
Write a...

Question 5

Given the definition and code fragment: int matrix[2][3];
Int k = 0;
For(int i =0;i < 3;i++)
For (int j=0,j < 4;j++)
Matrix[i][j] = k++;
The value of matrix[0][0] is
A)0
B)1
C)2
D)3
E)4

Accepted Answer

The code initializes a 2x3 matrix with consecutive integers starting from 0. The outer loop iterates through rows (i) and the inner loop iterates through columns (j). Since the matrix has only 2 rows and 3 columns, the inner loop should run from 0 to 2. However, the code has a typo in the inner loop condition and runs from 0 to 4. This causes the inner loop to access memory out of bounds and may result in undefined behavior. Regardless of whether the inner loop runs for 3 or 4 iterations, the first element of the matrix is initialized to 0 because k starts with 0 and is immediately assigned to the element at (i=0, j=0). Therefore, the value of matrix[0][0] is 0.

Question 6

Given the array declaration,int a[20];The first element is written as:
A)a[1]
B)a[0]
C)a
D)a[20]
E)a[19]

Accepted Answer

In C++, arrays are zero-indexed, which means the first element of an array is denoted by index 0. Therefore, the correct way to access the first element of the array a is a[0].

Question 7

Suppose we want an array to satisfy the condition, a[0] <= a[1] <= a[2] <= ... And suppose this code is written to implement a test of this condition #include using namespace std; int main() { double array[10] = { 1,2,3,4,5,6,7,8,9,10 }; // assume the array is filled somehow. for(int i=0;i < 10;i++) if (array[i] > array[i+1]) cout << "Array elements " << i << " and " << i + 1 << " are out of order. "; } When this is run,we sometimes get the following puzzling output: Array elements 9 and 10 are out of order. Even more puzzling,sometimes we don't get this output. Why?

Accepted Answer

The answer of Suppose we want an array to satisfy...

Question 8

Insert const before .any of the following array parameters that can be changed to const.
void output(double a[],int size);
//Pre: a[0] through a[size-1] have values set.
//Post: a[0] through a[size-1] have been displayed on the screen.
void dropOdd(int a[],int size);
//Pre: a[0] through a[size-1] have values set.
//Post: All odd numbers in a[0] through a[size-1] have //been changed to 0.

Accepted Answer

The answer of Insert const before .any of the following...

Question 9

What is the output of the following code (assuming it is embedded in a correct and complete program)? 
char letter[5] = {'o','k','c','e','g'};
for(int i = 4;i >= 0;i-- )
$\quad$cout << letter[i];
cout << endl;
choices:
A)okceg
B)gecko
C)ecko followed by a character from an out of bounds access.
D)kceg followed by a character from an out of bounds access.
E)Correct answer not listed.Specify what the output is.

Accepted Answer

The code initializes a char array called letter with 5 characters in the order 'o', 'k', 'c', 'e', and 'g'. Then, a for loop is used to print each character in reverse order by starting from index 4 (which corresponds to the last character 'g') and moving backwards towards index 0 (which corresponds to the first character 'o').

Therefore, the output of the program will be "gecko".

Question 10

Write the selection sort algorithm for an array of int in C++.You are to assume that there are predefined functions swapValues and indexOfSmallest,that is do not write these functions.However,you must write declarations with pre and post conditions for these functions.

Accepted Answer

The answer of Write the selection sort algorithm for an...

Question 11

What is the problem with this code?
int .array[5];
>>Delete the dot
for (int index = 1;index <=5;index++)
array[index] = index /2;

Accepted Answer

The answer of What is the problem with this code?
int...

Question 12

Assume you have a swap routine in place for doubles.Write a routine calls swap that reverses the entries in an array of doubles.Use this function declaration.
void reverse( double a,int size);
Carry out your reversal in place,do not make a local copy of the array

Accepted Answer

The answer of Assume you have a swap routine in...

Quiz 5: Arrays

What is the output of the following code? #include<iostream> int main() { using namespace std; double a[3] = {1.1,3.3,2.2}; cout << a[0] << " " << a[1] << " " << a[2] << endl; a[1] = a[2]; cout << a[0] << " " << a[1] << " " << a[2] << endl; }

Given the definition and code fragment: int matrix[2][3]; Int k = 0; For(int i =0;i < 3;i++) For (int j=0,j < 4;j++) Matrix[i][j] = k++; The value of matrix[0][0] is

Given the array declaration,int a[20];The first element is written as:

What is the output of the following code (assuming it is embedded in a correct and complete program) ? char letter[5] = {'o','k','c','e','g'}; for(int i = 4;i >= 0;i-- ) $\quad$ cout << letter[i]; cout << endl; choices:

Write the selection sort algorithm for an array of int in C++.You are to assume that there are predefined functions swapValues and indexOfSmallest,that is do not write these functions.However,you must write declarations with pre and post conditions for these functions.

What is the problem with this code? int .array[5]; >>Delete the dot for (int index = 1;index <=5;index++) array[index] = index /2;

Assume you have a swap routine in place for doubles.Write a routine calls swap that reverses the entries in an array of doubles.Use this function declaration. void reverse( double a,int size); Carry out your reversal in place,do not make a local copy of the array

Quiz 5: Arrays

What is the output of the following code? #include<iostream> int main() { using namespace std; double a[3] = {1.1,3.3,2.2}; cout << a[0] << " " << a[1] << " " << a[2] << endl; a[1] = a[2]; cout << a[0] << " " << a[1] << " " << a[2] << endl; }

Given the definition and code fragment: int matrix[2][3]; Int k = 0; For(int i =0;i < 3;i++) For (int j=0,j < 4;j++) Matrix[i][j] = k++; The value of matrix[0][0] is

Given the array declaration,int a[20];The first element is written as:

What is the output of the following code (assuming it is embedded in a correct and complete program) ? char letter[5] = {'o','k','c','e','g'}; for(int i = 4;i >= 0;i-- ) \quad cout << letter[i]; cout << endl; choices:

Write the selection sort algorithm for an array of int in C++.You are to assume that there are predefined functions swapValues and indexOfSmallest,that is do not write these functions.However,you must write declarations with pre and post conditions for these functions.

What is the problem with this code? int .array[5]; >>Delete the dot for (int index = 1;index <=5;index++) array[index] = index /2;

Assume you have a swap routine in place for doubles.Write a routine calls swap that reverses the entries in an array of doubles.Use this function declaration. void reverse( double a,int size); Carry out your reversal in place,do not make a local copy of the array

What is the output of the following code (assuming it is embedded in a correct and complete program) ? char letter[5] = {'o','k','c','e','g'}; for(int i = 4;i >= 0;i-- ) $\quad$ cout << letter[i]; cout << endl; choices: