#include <stdio.h>
#include<stdlib.h>
/*

//Lab 2

//********ARRAY***************

//*** Array to store the muiptle variables in the single variables
//Syntax; Datatype arrayname[Length_of_the_ array]= (element1 and element2,....);

//***********POINTER***************
//*****POINTER is used to store the memory



//***Dynamic Memory Allocation 

//**int arr[5]; not able to change the size of the array after ceration.

//A function malloc(), calloc(); free(), realloc()
//malloc( used to dynamically allcoate the single block of memory with the specific size.
//Syntax: datatype * pointerName = (cast_type*)mallo(size_int_bytes);
/*

cast_type, 

calloc() – contiguous allocation is used to dynamically allocate the specified
number of blocks of memory with the specified type.
- Syntax: ptr = (cast_type*) calloc(n, element_size_in_bytes);

realloc() – re-allocation is used to dynamically change the memory allocation of a
previously allocated memory.
- Syntax: ptr = realloc(ptr, new_size);


 free() – delocate or releasing the memory, reduce the wastage of memory.
- Once memory is no longer needed, we must release it using free() function
- Syntax: free(ptr);





*/
void update(int * ptr){
    * ptr = 30;
    
}
int main() {

    int size = 5;

    int* ptr = (int*)malloc(size*sizeof(int));


    //ptr to the first element
    //*ptr the value of the 1st element

    for(int i=0;i<size;i++){
        scanf("%d", (ptr+i));
            }

    for(int i=0;i<size;i++){
        printf("%d, \n", *(ptr+i));
    }

    free(ptr);


    //int A = 21;
  //  int * ptr = &A;

   // update(&A);

    //printf("%d\n", A);
     

    //ptr is used the store the addree of A
    //*ptr is used to store the value of A



    //printf("Address of A using the pointer" %p\n, ptr);
    //printf(Value of A using a pointer: %d,*ptr);

    //int arr[5] = { 25, 30, 59, 65, 100};
   // int* ptr = arr;
   // printf("%d\n", *(ptr + 1)); // Outputs 2




   // for(int i = 0; i < 5;i++){
    
   //  printf(" %d \n", *(ptr + i);

    
    //int arr[5] = {25, 30, 59, 65, 100};//index is 0, 1, 2, 3, 4.

    //Last index < the length_of_array

    //printf(" %d \n", arr[1]);

    //Display all the elements of the array.
    //for(int i = 0; i < 5;i++){
    //    printf(" %d \n", arr[i]); //i=0 => 25, 1 = 1 => 30,.....
    

    
    printf("Hello world!\n");
    return 0;
}