Skip to main content

Insertion and Deletion of elements in a Sorted Array

In the article Insertion and Deletion of elements in an Array, we saw how data is inserted and deleted in an unsorted array. In that case, we needed two information, the element as well as the position, for insertion while for deletion we needed the position. In the case of sorted arrays insertion and deletion takes pace in a slightly different way.

The following example will clarify this:

Suppose we have the following array:


And, we need to insert the element 6, so where it should be inserted? We can’t insert it at any place because then the array might not remain sorted. Therefore, we let the program to automatically calculate the position suitable for the new element, so that the array remains sorted even after insertion.

Now, arr[5]={1,2,3,4,6}

Now, suppose we wish to delete the element 6, in this case we don’t use the position for deletion because we don’t know where the element was placed by the program, so rather than referencing the position for deletion, we reference the element itself.


Therefore, we conclude that while insertion we can use the same process that we used in the case of unsorted array but in spite of us giving the position the program will itself calculate it. Similarly, while deletion we have to reference the element and its position will be found out by the program. The rest of the process remains the same as we did for the insertion and deletion in an unsorted array.

I don’t think there is any need for further discussion on this topic, so we straightaway move on to the example program. The program is self-explanatory, wherever needed I have provided the comments.

  // Example Program to illustrate
  // insertion and deletion of
  // elements in a sorted array

  // array has been declared as
  // global so that other functions
  // can also have access to it
  int arr[5]={1,2,3,4,5};
  // function prototype
  void a_insert(int);
  void a_delete(int);

  void main(void)
   int ch;
   int num;

    cout<<"1> Insert";
    cout<<"\n2> Delete";
    cout<<"\n3> Show";
    cout<<"\n4> Quit\n";


     case 1:
     cout<<"enter element:";


     case 2:
     cout<<"enter element.:";

     case 3:
     for(int i=0;i<5;i++)
       if(arr[i]!=0) cout<<arr[i]<<" ";

  // insertion function
  void a_insert(int num)
   int pos;
   // find the position where
   // the element 'num' should
   // be inserted

   // insert 'num' at the
   // appropriate position
   for(int i=4; i>=pos;i--)

  // deletion function
  void a_delete(int num)
   int pos;

   // find the position where
   // the element 'num' is at
   // ARRAY---

   // delete 'num' from the
   // appropriate position
   for(int i=pos; i<=4;i++)


Do check back for updates!

Related Articles:

Popular posts from this blog

Fix For Toshiba Satellite "RTC Battery is Low" Error (with Pictures)

RTC Battery is Low Error on a Toshiba Satellite laptop "RTC Battery is Low..." An error message flashing while you try to boot your laptop is enough to panic many people. But worry not! "RTC Battery" stands for Real-Time Clock battery which almost all laptops and PCs have on their motherboard to power the clock and sometimes to also keep the CMOS settings from getting erased while the system is switched off.  It is not uncommon for these batteries to last for years before requiring a replacement as the clock consumes very less power. And contrary to what some people tell you - they are not rechargeable or getting charged while your computer or laptop is running. In this article, we'll learn everything about RTC batteries and how to fix the error on your Toshiba Satellite laptop. What is an RTC Battery? RTC or CMOS batteries are small coin-shaped lithium batteries with a 3-volts output. Most laptops use

The Best Way(s) to Comment out PHP/HTML Code

PHP supports various styles of comments. Please check the following example: <?php // Single line comment code (); # Single line Comment code2 (); /* Multi Line comment code(); The code inside doesn't run */ // /* This doesn NOT start a multi-line comment block /* Multi line comment block The following line still ends the multi-line comment block //*/ The " # " comment style, though, is rarely used. Do note, in the example, that anything (even a multi-block comment /* ) after a " // " or " # " is a comment, and /* */ around any single-line comment overrides it. This information will come in handy when we learn about some neat tricks next. Comment out PHP Code Blocks Check the following code <?php //* Toggle line if ( 1 ) {      // } else {      // } //*/ //* Toggle line if ( 2 ) {      // } else {      // } //*/ Now see how easy it is to toggle a part of PHP code by just removing or adding a single " / " from th

How to Remove Bullet Points in CSS

This will be a short guide on how to remove bullet points from ordered/unordered lists with CSS, you only need two lines of CSS for this. The first removes the actual bullet points and the second one removes the space to the left, as evident from the following video: We'll also be doing some bullet beautification in the last section if that's what you are looking to do. How to Remove Bullet Points in HTML/CSS Now that we know what CSS properties actually accomplish what we want let's see how we can implement this in our HTML code. Using Inline "style" Tag (The quick and dirty way) As the title suggests, this is the quickest way to remove bullet points in which you wouldn't have to edit any CSS files (for example, for Blogger or WordPress). This method would be useful for a one-off case - just add the following " style " attribute to the list you want to remove the bullet points from: <h1>Ordered List</h1> <ol  style="list-styl