Arrays in C++ Programming

An array is a collection of elements of the same type placed in contiguous memory locations that can be individually referenced by using an index to a unique identifier. An array is a variable that can store multiple values. For example, if you want to store 5 integers, you can create an array for it.

Syntax :
datetype arrayName [ arraySize ] ;
Example :
int arr [ 5 ] ;

This program demonstrates the use of arrays in C++ and prints out the elements of two different arrays:

Declare two integer arrays a and b.
Initialize a with the values 10 and 20. Since only the first two elements of a are explicitly initialized, the rest are set to 0 by default.
Initialize b with the values 1, 2, 3, 4, and 5.
Use a range-based for loop to iterate through each element x in a and print it to the console.
Print a separator line of dashes.
Use another range-based for loop to iterate through each element x in b and print it to the console.
Calculate and print the number of elements in a by dividing the total size of the array in bytes (sizeof(a)) by the size of a single integer in bytes (sizeof(int)).

Source Code

#include<iostream>
using namespace std;
 
int main()
{
    int a[5]={10,20};//10  20 0 0 0
    int b[]={1,2,3,4,5};
    for(int x:a)
        cout<<x<<endl;
    cout<<"------------"<<endl;
    for(int x:b)
        cout<<x<<endl;
    cout<<"Count :"<<sizeof(a)/sizeof(int);
    return 0;
}

Output

10
20
0
0
0
------------
1
2
3
4
5
Count :5

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