C++ Array

In this article, you will learn to use arrays. You will learn to declare, initialize, and access array elements in C ++Declaration, initialization, and access to array elements in programming.

One of the common problems encountered in programming is handling a large amount of data of the same type.

For example, in this case, you are dealing with100 people to be surveyed, and their ages must be stored in C ++To solve this problem in it, you can create an array containing100 elements integer array.

An array is a collection of a fixed number of elements of the same type. For example:

int age[100];

In this case, the age array can accommodate up to100 integer type elements.

After declaring an array, the size and type of the array cannot be changed.

How to initialize an array in C ++How to declare an array in it?

dataType arrayName[arraySize];

For example,

float mark[5];

Here, we declare a float type and an array of size5 This means that the array mark can accommodate5a floating-point value.

What are the elements of the array and how to access the elements of the array?

You can access the elements of the array using the index.

Assuming you have declared a mark array as described above. The first element is mark[0], and the second element is mark[1], and so on.

Several main points to note:

• The first index of the array is 0, not1In this example, mark[0] is the first element.

• If the size of the array is n, to access the last element, the index (n-1). In this example, mark[4] is the last element.

• Suppose the starting address of mark [0] is2120d. Then, the next address a [1] will be2124d, a [2The address of ] will be2128d, and so on. This is because the size of float is4bytes.

How to initialize an array in C ++Initialize an array in programming?

Arrays can be initialized during declaration. For example,

int mark[5] = {19,　10,　8,　17,　9};

Another way to initialize an array during declaration:

int mark[] = {19,　10,　8,　17,　9};

Here,

mark[0] =　19
mark[1] =　10
mark[2] =　8
mark[3] =　17
mark[4] =　9

How to insert and print array elements?

int mark[5] = {19,　10,　8,　17,　9{
//　Change the4element to9
mark[3] =　9;
//　Get input from the user and insert the third element
cin >> mark[2];
//　Accept user input and insert the (i　+　1） element
cin >> mark[i];
//　Print the first element of the array
cout << mark[0];
//　Print the i-th element of the array
cout >> mark[i-1];

Example: C ++Array

C ++Program is used to store and calculate the sum of numbers entered by the user using an array5sum of numbers.

#include <iostream>
using namespace std;
int main()　
{
　　　　int numbers[5], sum = 0;
　　　　cout << "Input5numbers: ";
　　　　
　　　　//Enter the5numbers are stored in an array
　　　　　//Find the sum of the entered numbers
　　　　for (int i = 0; i <　5;　++i)　
　　　　{
　　　　　　　　cin >> numbers[i];
　　　　　　　　sum　+= numbers[i];
　　　　{
　　　　
　　　　cout << "Sum = " << sum << endl;　　
　　　　
　　　　return 0;
{

Output result

Input5numbers:　3
4
5
4
2
Sum =　18

In C ++things to remember when using arrays

Suppose you declare an array consisting of10elements. For example

int testArray[10];

You can access from testArray[0] to testArray[9members of the array].

If you try to access array elements outside the array bounds, such as testArray[14], the compiler may not display any errors. However, this may lead to unexpected output (undefined behavior).

Before proceeding, please check the following C ++Array article:

• How to pass an array to a function?

• The relationship between arrays and pointers

• Multidimensional Arrays

C++ Detailed explanation of arrays

In C++ In this context, arrays are very important, and we need to learn more about the details of arrays. The following lists C++ Programmers must be clear about some important concepts related to arrays: