minor additions/corrections (#20478)

Small grammar corrections, and additions info/examples

guide/english/cplusplus/arrays/index.md

@@ -5,6 +5,9 @@ title: C++ Arrays
 ## What are Arrays?  
 An array is a series of elements of the same data type which are stored in contiguous memory locations and can be referenced individually.  
 
+Declaration:
+dataType arrayName[arraySize];
+
 For example, an array containing 5 integer values called numbers is declared like so:  
 ```C++
 int numbers [5];
@@ -24,10 +27,10 @@ int numbers [] = {1, 2, 3, 4, 5};
 //In the examples above, the size was fixed beforehand
 ```
 ## Types Of Arrays
-There are two types of array based on way, we declare it.
+There are two types of arrays based on the way we declare it.
 
 **1**. Static array:
-Those arrays whose size is defined before compile time like in the examples above, are called static arrays. In these arrays we can't change their size, once they are declared.
+Those arrays whose size is defined before compile time like in the examples above, are called static arrays. In these arrays we can't change their size once they are declared.
 
 **2**. Dynamic array:
 Dynamic arrays are those arrays, whose size is not known at compile time and we can define their size at run time. These arrays are created by using **new** keyword and when done with that array we can delete that array by using the **delete** keyword.
@@ -40,3 +43,23 @@ x = numbers[0]; // = 1. [0] == first position
 numbers[2] = 55; // Sets the third position (3) to the new number 55
 //numbers[] is now: {1, 2, 55, 4, 5}
 ```
+
+How to insert and print array elements:
+```C++
+int vnum[5] = {1, 2, 3, 4, 5}
+
+// change 4th element to 9
+vnum[3] = 9;
+
+// take input from the user and insert in third element
+cin >> vnum[2];
+
+// take input from the user and insert in (i+1)th element
+cin >> vnum[i];
+
+// print first element of the array
+cout << vnum[0];
+
+// print (i)th element of the array
+cout >> vnum[i-1];
+```