What is an Array?

Data Structure > Array > Array Introduction in Data Structure

Short Question

744

Answer:

An Array can be defined as a data structure having fixed size sequenced collection of elements of same data type and which can be referenced through the same variable name. An Array is a name given to a group of similar quantities.

Declaring an array

Type variable_name [length of array];

For example:-

double height[10];
float width[20];
int min[9];
int myArray[5] = {1, 2, 3, 4, 5}; //declare and initialize the array in one statement

In C language array starts at position 0. C language treats array name as the pointer to the first element and an item in the array can be accessed through its index.

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Related Program List

558. How to read and write data in an array?

Answer:

In this section you will learn how to read and write data in an array using c programming Language


#include<stdio.h>
void main ()
{
int array[10], n;
// Reading an array
printf("Enter size of an array");
scanf ("%d", &n);
printf("Enter array elements");
for (i=0;i<n;i++)
scanf ("%d", &array[i]);
// writing an array
printf("array elements are");
for (i=0;i<n;i++)
printf ("%d", array[i]);
}

# Tutorial: Array Introduction in Data Structure

Question: Array Short

559. How to insert data in an array at a particular position?

Answer:

To insert a value into an array, you need to shift every value after the location you want to insert. the logic is very simple: start from the end and copy the previous item to the current element until you hit the location you want to insert.

# Tutorial: Array Introduction in Data Structure

Question: Array Short

560. Write code to insert data in an array at a particular position

Answer:



#include<stdio.h>
Void main ()
{
int array [10], n elem, pos;
// Reading an array
printf (                  </div>
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                    <small># Tutorial: Array Introduction in Data Structure</small> 
                </a>
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                        <a style="color:#9e9d9d;" href="/qa/-/3/54">
                <small><i class="fa fa-code" aria-hidden="true"></i> Question: Array</small>
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                                   <span class="float-end" style="color:#9e9d9d"> <small><i class="fa fa-check" aria-hidden="true"></i> Short </small></span>  
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            <div class="list-group divStyleQuestion" style="border:1px solid #e0e0e0;padding:8px">
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              <a href="/qanswer/how-to-delete-an-element-from-a-specified-position-from-an-array-question/54/561">
                  <h5 class="mb-1" style="color:#194757;">561. &nbsp;How to delete an element from a specified position from an array?</h5>
              </a>
            </div>
                            <div class="card">
                  <div class="card-body">
                     Answer: <p> To delete a value from an array, you need to shift every value after the
location you want to delete. The logic is very simple: start from the position
you want to delete and copy the previous item to the current element until
end of the array.</p>                  </div>
                </div>
                        <div class="d-flex w-100 justify-content-between">
                <a style="color:#9e9d9d;" href="/tutorial/array-introduction-in-data-structure/3/300">
                    <small># Tutorial: Array Introduction in Data Structure</small> 
                </a>
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                        <a style="color:#9e9d9d;" href="/qa/-/3/54">
                <small><i class="fa fa-code" aria-hidden="true"></i> Question: Array</small>
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                                   <span class="float-end" style="color:#9e9d9d"> <small><i class="fa fa-check" aria-hidden="true"></i> Short </small></span>  
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            <div class="list-group divStyleQuestion" style="border:1px solid #e0e0e0;padding:8px">
            <div class="d-flex w-100 justify-content-between">
              <a href="/qanswer/write-code-to-delete-data-from-an-array-from-a-particular-position-question/54/562">
                  <h5 class="mb-1" style="color:#194757;">562. &nbsp;Write code to delete data from an array from a particular position?</h5>
              </a>
            </div>
                            <div class="card">
                  <div class="card-body">
                     Answer: <pre class="prettyprint">
<xmp>
#include<stdio.h>
void main ()
{
int array[10], n elem ,pos;
// Reading an array
printf(                  </div>
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                        <div class="d-flex w-100 justify-content-between">
                <a style="color:#9e9d9d;" href="/tutorial/array-introduction-in-data-structure/3/300">
                    <small># Tutorial: Array Introduction in Data Structure</small> 
                </a>
            </div>
           
                        <a style="color:#9e9d9d;" href="/qa/-/3/54">
                <small><i class="fa fa-code" aria-hidden="true"></i> Question: Array</small>
            </a>
                                   <span class="float-end" style="color:#9e9d9d"> <small><i class="fa fa-check" aria-hidden="true"></i> Short </small></span>  
                            </div>
      
            <div class="list-group divStyleQuestion" style="border:1px solid #e0e0e0;padding:8px">
            <div class="d-flex w-100 justify-content-between">
              <a href="/qanswer/how-to-merge-two-sorted-arrays-question/54/563">
                  <h5 class="mb-1" style="color:#194757;">563. &nbsp;How to merge two sorted arrays?</h5>
              </a>
            </div>
                            <div class="card">
                  <div class="card-body">
                     Answer: <p>Assume, that both arrays are sorted in ascending order and we want resulting array to maintain the same order. Algorithm to merge two arrays A[0..m-1] and B[0..n-1] into an array C[0..m+n-1] is as following:<br />1. Introduce read-indices i, j to traverse arrays A and B, accordingly. Introduce write-index k to store position of the first free cell in the resulting array. By default i = j = k = 0.<br />2. At each step: if both indices are in range (i &lt; m and j &lt; n), choose minimum of (A[i], B[j]) and write it to C[k]. Otherwise go to step 4.<br />3. Increase k and index of the array, algorithm located minimal value at, by one. Repeat step 2.<br />4. Copy the rest values from the array, which index is still in range, to the resulting array.</p>                  </div>
                </div>
                        <div class="d-flex w-100 justify-content-between">
                <a style="color:#9e9d9d;" href="/tutorial/array-introduction-in-data-structure/3/300">
                    <small># Tutorial: Array Introduction in Data Structure</small> 
                </a>
            </div>
           
                        <a style="color:#9e9d9d;" href="/qa/-/3/54">
                <small><i class="fa fa-code" aria-hidden="true"></i> Question: Array</small>
            </a>
                                   <span class="float-end" style="color:#9e9d9d"> <small><i class="fa fa-check" aria-hidden="true"></i> Short </small></span>  
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            <div class="list-group divStyleQuestion" style="border:1px solid #e0e0e0;padding:8px">
            <div class="d-flex w-100 justify-content-between">
              <a href="/qanswer/write-code-to-merge-two-sorted-arrays-question/54/564">
                  <h5 class="mb-1" style="color:#194757;">564. &nbsp;Write code to merge two sorted arrays?</h5>
              </a>
            </div>
                        <div class="d-flex w-100 justify-content-between">
                <a style="color:#9e9d9d;" href="/tutorial/array-introduction-in-data-structure/3/300">
                    <small># Tutorial: Array Introduction in Data Structure</small> 
                </a>
            </div>
           
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              <a href="/qanswer/what-is-two-dimensional-array-question/54/565">
                  <h5 class="mb-1" style="color:#194757;">565. &nbsp;What is two dimensional array?</h5>
              </a>
            </div>
                        <div class="d-flex w-100 justify-content-between">
                <a style="color:#9e9d9d;" href="/tutorial/array-introduction-in-data-structure/3/300">
                    <small># Tutorial: Array Introduction in Data Structure</small> 
                </a>
            </div>
           
                        <a style="color:#9e9d9d;" href="/qa/-/3/54">
                <small><i class="fa fa-code" aria-hidden="true"></i> Question: Array</small>
            </a>
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              <a href="/qanswer/how-to-read-and-write-data-in-2-d-array-question/54/566">
                  <h5 class="mb-1" style="color:#194757;">566. &nbsp;How to read and write data in 2-D array?</h5>
              </a>
            </div>
                        <div class="d-flex w-100 justify-content-between">
                <a style="color:#9e9d9d;" href="/tutorial/array-introduction-in-data-structure/3/300">
                    <small># Tutorial: Array Introduction in Data Structure</small> 
                </a>
            </div>
           
                        <a style="color:#9e9d9d;" href="/qa/-/3/54">
                <small><i class="fa fa-code" aria-hidden="true"></i> Question: Array</small>
            </a>
                                  <span class="float-end" style="color:#9e9d9d"> <small><i class="fa fa-check" aria-hidden="true"></i> Long </small></span>
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              <a href="/qanswer/write-an-algorithm-to-multiply-two-2-dimensional-array-question/54/567">
                  <h5 class="mb-1" style="color:#194757;">567. &nbsp;Write an algorithm to multiply two 2-Dimensional array?</h5>
              </a>
            </div>
                            <div class="card">
                  <div class="card-body">
                     Answer: <p>Multiplication of two matrixes:<br />Rule: Multiplication of two matrixes is only possible if first matrix has size<strong> m X n</strong> and other matrix has size <strong>n x r</strong>. Where m, n and r are any positive integer.</p>
<p><span style="color: #3366ff;"><em>Multiplication of two matrixes is defined as:</em></span></p>
<p><span style="color: #3366ff;"><em><img class="img-responsive" src="/blog/images/114688820-ds-image-1.png" alt="" width="320" height="69" /></em></span></p>
<p><span style="color: #000000;">Where 1 ? i ? m and 1 ? j ? n</span></p>
<p><span style="color: #000000;"><br /><strong>For example:</strong><br />Suppose two matrixes A and B of size of 2 x 2 and 2 x 3 respectively:</span></p>
<p><span style="color: #000000;"><img class="img-responsive" src="/blog/images/715013965-ds-image-2.png" alt="" width="771" height="596" /></span></p>
<p><span style="color: #000000;">Here A is a two                   </div>
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                    <small># Tutorial: Array Introduction in Data Structure</small> 
                </a>
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