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Chapter 7: Problem 1

What is the difference between a size declarator and a subscript?

Short Answer

Expert verified
Answer: The main difference between a size declarator and a subscript is their purpose and usage. A size declarator is used when declaring an array, specifying its size and the number of elements it can hold. On the other hand, a subscript is used to access and manipulate individual elements within an array by providing their position.

Step by step solution

01

Define a size declarator

A size declarator is used in the declaration of an array to define its size, which is the total number of elements that the array can hold. The size declarator is essential because it provides the compiler with the necessary information about the size of the array, so the right amount of memory is allocated.
02

Give an example of a size declarator

Consider declaring an integer array in C++: ```cpp int numbers[5]; ``` In this example, `[5]` is the size declarator, telling the compiler that the array `numbers` will have a total of 5 elements.
03

Define a subscript

A subscript (also known as an index) is used to access and manipulate a specific element within an array. It represents the position of the element within the array, with the first element usually having a subscript (index) of 0.
04

Give an example of a subscript

Using the previously declared integer array `numbers`: ```cpp numbers[0] = 10; numbers[1] = 20; numbers[2] = 30; ``` In these examples, the values in the brackets, such as `[0]`, `[1]`, and `[2]`, are the subscripts. They allow us to access and modify the specific elements within the `numbers` array.
05

Explain the primary difference

The primary difference between a size declarator and a subscript is their purpose and usage. A size declarator is used when declaring an array, specifying the size of the array and the number of elements it can hold. In contrast, a subscript is used to access and manipulate individual elements within an array by providing their position.

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Most popular questions from this chapter

Assuming that array1 and array2 are both arrays, why is it not possible to assign the contents of array2 to array1 with the following statement? array1 = array2;

The subscript of the last element in a single-dimensional array is one less than the total number of elements in the array.

Look at the following array definition. int numberArray[9][11]; Write a statement that assigns 145 to the first column of the first row of this array. Write a statement that assigns 18 to the last column of the last row of this array.

Look at the following array definition. int numbers[5] = { 1, 2, 3 }; What value is stored in numbers[2]? What value is stored in numbers[4]?

Look at the following array definition. double sales[8][10]; How many rows does the array have? How many columns does the array have? How many elements does the array have? Write a statement that stores a number in the last column of the last row in the array.
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