Question 1

Given the two C++ array declarations:
int a[10],b[10];
You can successfully compute one array,say a,then assign b to a:
a = b;

Accepted Answer

When we try to assign an array to another array, it is not a valid operation in C++. We have to individually copy the elements of one array to another array using a loop or a copy function.

Question 2

Arrays in C++ may have several different types stored in them.

Accepted Answer

Arrays in C++ must have a consistent data type for all elements stored in them.

Question 3

Distinguish the use of the square brackets [] in a definition of an array and their use for access to some indexed variable of the array.

Accepted Answer

In the definition of an array,for example,int array[10];the [] are used to define the array,the number between the brackets specifies the declared size,that is,it specifies how many indexed variables are being defined.This could be any number.
In the access to an indexed variable,for example,array[5] = 14;the number between the brackets specifies which of the indexed variables is being accessed.This must be between 0 and one less than the declared size of the array.Technically,the [] are called the subscripting operator.

Question 4

When using an array,it is perfectly legal to access indexed variables with index values less than 0 or greater than or equal to the declared size of the array.

Accepted Answer

It is not legal to access indexed variables with index values less than 0 or greater than or equal to the declared size of the array. It will result in an "Index out of Bounds" error.

Question 5

Indexed variables for an array are stored wherever the computer finds memory for the first indexed variable,then the next one is stored next to the first if there is space,and someplace else if not.

Accepted Answer

Indexed variables for an array are stored in contiguous memory locations, meaning each element is stored right next to the previous one in a sequential manner, ensuring that they occupy a single, continuous block of memory.

Question 6

To call a function with an array parameter,write the array argument as the array name followed by empty square brackets,as in f(a[],7); (The first argument is an array a,the second is the size. )

Accepted Answer

To call a function with an array parameter, you only need to provide the array name without square brackets, as in `f(a, 7);`. The square brackets are used in the function definition to indicate that the parameter is an array, not when calling the function.

Question 7

In the sequential search algorithm,items are examined alternately,odd then evens,in order to find whether the target value is in the array (and if the target is present,to the index of the target. )

Accepted Answer

In the sequential search algorithm, items are examined one by one sequentially in the given order to find the target value.

Question 8

The programmer should always use a defined constant in an array declaration.

Accepted Answer

Using a defined constant in an array declaration helps to ensure maintainability and makes the code more readable. It also prevents errors due to typos or accidental changes to the value of the constant.

Question 9

C++ arrays check for out-of-range index values.

Accepted Answer

C++ does not perform automatic bounds checking on arrays, so accessing an array with an out-of-range index can lead to undefined behavior.

Question 10

A for-loop is a convenient way to step through an array.

Accepted Answer

Yes, a for-loop is commonly used to iterate through each element in an array or collection.

Question 11

With arrays,indices start at any number the programmer chooses to indicate in the definition.

Accepted Answer

With arrays, indices start at 0 by default and can only be integers.

Question 12

Consider the array declaration,int x[20];.There is no memory allocated for x[20].

Accepted Answer

The declaration int x[20] allocates memory for 20 integers, with indices ranging from 0 to 19.

Question 13

Write a C++ code fragment that is assumed to be embedded in an otherwise complete and correct program.You are to assume the user has been prompted (so you don't have to)for (exactly)20 values of type int to be read from the keyboard,You are to use this input to fill an array.Do not write a full program,just the code fragment to do this.Do give declarations of the array and any variables you use.

Accepted Answer

The answer of Write a C++ code fragment that is...

Question 14

An array behaves like a list of variables each of which is of the same type and for which there is a uniform,convenient naming convention that can be declared in a single line of code.In the explanation,give an example of declaration and access.

Accepted Answer

Example of declaration:

int myArray[5]; // declares an integer array of size 5

Example of accessing elements of the array:

myArray[0] = 10; //  assigns 10 to the first element of the array
int x = myArray[2]; // retrieves the third element of the array and assigns it to variable x.

Question 15

If you need an array with more than one index,you can use a multidimensional array,which is actually an array of arrays.In the explanation,declare an array of doubles with 2 rows and 5 columns.

Accepted Answer

A multidimensional array can have more than one index, and can be thought of as an array of arrays. In this case, we are asked to declare an array of doubles with 2 rows and 5 columns, which would be a valid example of a multidimensional array.

Question 16

If we want to find the median of 100 scores,we need 100 separate variables to hold the data..

Accepted Answer

We do not need 100 separate variables to hold the data. We can simply store the data in an array or a list and then sort it to find the median. Alternatively, we can use a more efficient algorithm like the quickselect algorithm to find the median without sorting the entire array.

Question 17

In a sorting an array,the items in the array are rearranged so that
for all j and k,if j < k,then array[j]<=array[k]

Accepted Answer

This is the definition of a sorted array - the values are arranged in ascending order such that each value is less than or equal to the next value.

Question 18

In the definition,double d[10] = {0.0};only d[0] is initialized to zero,the rest are uninitialized,just like x in the definition double x;

Accepted Answer

In the definition `double d[10] = {0.0};`, not only is `d[0]` initialized to zero, but all elements in the array are implicitly initialized to zero. This is a feature of C and C++ where if an array is partially initialized, the rest of the elements are automatically initialized to zero.

Question 19

Describe the difference in the meaning of the 5 in int x[5];and the meaning of the 4 in x[4].What are the meanings of the int,the [5] and the [4]?

Accepted Answer

The answer of Describe the difference in the meaning of...

Question 20

Give the syntax of an array declaration.Mention the base type and declared size.

Accepted Answer

The answer of Give the syntax of an array declaration.Mention...

Quiz 5: Arrays

Given the two C++ array declarations: int a[10],b[10]; You can successfully compute one array,say a,then assign b to a: a = b;