C Program to Insert an Element in an Array Last Updated : 16 Jan, 2025 Comments Improve Suggest changes Like Article Like Report In this article, we will learn how to insert an element into an array in C.C arrays have a fixed size, so we cannot dynamically increase their memory. However, we can insert an element if the array already have enough memory space to accommodate the new elementsInsert Element at Specific PositionTo insert an element at a specific position, shift all elements to the right of the specified position one step to the right. This will create an empty space at the specified position. Then, insert the new element at the desired position. C #include <stdio.h> void insert(int arr[], int *n, int pos, int val) { // Shift elements to the right for (int i = *n; i > pos; i--) arr[i] = arr[i - 1]; // Insert val at the specified position arr[pos] = val; // Increase the current size (*n)++; } int main() { int arr[7] = {10, 20, 30, 40, 50}; int n = 5; int pos = 3; int val = 25; // Insert the value at the specified position insert(arr, &n, pos, val); for (int i = 0; i < n; i++) printf("%d ", arr[i]); return 0; } Output10 20 30 25 40 50 Explanation: In the given program, the function insert() shifts all elements starting from the insertion index 3 one step to the right. The new value 25 is then inserted at the desired position, and the size of the array is incremented. Time Complexity: O(n) (for Shifting) + O(1) (for incrementing size) = O(n)Auxiliary Space: O(1)If you want to explore array manipulation and other data structures, the C Programming Course Online with Data Structures provides hands-on examples and exercises.Insert an Element at the End of an ArrayIf you are inserting an element at the end, there's no need for shifting elements. You can directly add the element at the next available position and increase the size. C #include <stdio.h> void insertLast(int arr[], int *n, int val) { // Insert val at last arr[*n] = val; // Increase the current size (*n)++; } int main() { int arr[7] = {10, 20, 30, 40, 50}; int n = 5; int val = 25; // Insert the value at the end insertLast(arr, &n, val); for (int i = 0; i < n; i++) printf("%d ", arr[i]); return 0; } Output10 20 30 40 50 25 Time Complexity: O(1) (for decrementing size)Auxiliary Space: O(1)Note: Apart from insertion at the end, all cases will be handled same as insertion at specific position. Also, make sure array have enough space to avoid segmentation faults. Comment More infoAdvertise with us Next Article C Program to Insert an Element in an Array C code_r Follow Improve Article Tags : C Language c-array C-Arrays Similar Reads C Programming Language Tutorial C is a general-purpose mid-level programming language developed by Dennis M. Ritchie at Bell Laboratories in 1972. It was initially used for the development of UNIX operating system, but it later became popular for a wide range of applications. Today, C remains one of the top three most widely used 5 min read Dynamic Memory Allocation in C using malloc(), calloc(), free() and realloc() In C, a variable defined in a function is stored in the stack memory. The requirement of this memory is that it needs to know the size of the data to memory at compile time (before the program runs). 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