free() in C programming.

Syntax: Syntax of free() function in C is shown below:

void free(void *ptr);

#include <stdio.h>
#include <stdlib.h>
int main()
 {
     // The pointer ptr is used to hold the
  // base address of the block created
  int* ptr;
  int no=0;
  // Accepts the total number of elements for the array
   printf("Enter number of Elements:\n”);
  scanf("%d", &no);
  // Dynamically allocate memory using calloc()
   ptr = (int*)calloc(no, sizeof(int));
   // Check if the memory is successfully
  // allocated by calloc() function
   if (ptr == NULL)
    {
    printf("\n Fail to Allocate Memory! \n");
    exit(0);
    }
   // Memory has been Successfully allocated using calloc()
   printf("\n Memory Has been allocated Successfully using \"calloc()\”. \n");
  // Release or free the memory
  free(ptr);
   printf("\n The memory allocated using Calloc has Successfully freed.");
  return 0;
 }
 Output:
  Enter number of Elements: 10
 Memory Has been allocated Successfully using "calloc()".
 The memory allocated using Calloc has Successfully freed.

#include <stdio.h>
#include <stdlib.h>
int main()
{
 int size = 10;
  int *my_arr = (int*) calloc(size * sizeof(int));
  int i,n;
  printf(“\n Enter %d number to add in array\n”);
  for(i = 0; i< size; i++)
  {
  scanf(“%d”,&n);
  my_arr[i] = n;
  }
 // Add a new element to the array
  printf(“\n Add new Element to an array\n”);
  scanf(“%d”,&n);
  size++;
  my_arr = (int*) realloc(my_arr, size * sizeof(int));
 my_arr[size-1] = n;
 printf(“\n Your Array Elements are here\n”);
  for(i = 0; i< size; i++)
  {
   printf("%d ", my_arr[i]);
 }
  free(my_arr);
  return 0;
 
}