How recursive bubble sort work

                                              Recursive Bubble Sort Base Case: If array size is 1, return. Do One Pass of normal Bubble Sort. This pass fixes last element of current subarray. Recur for all elements except last of current subarray. Example: Index=     0 1  2 3 4 5 6 7   100                          90 80 70 60 50 40 30  Array []= Suppose we want to sort the above in the increasing order by the recursive bubble sort. Make a get grater which will return the grater of the array. Compare the first and last element of the array if the first is greater than last the swap with each other. And again call the sort function and decrement the array size by 1; 1) 30                     90 80 70 60 50 40 100    ...
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Pointers in C


Pointer is a variable that points to or references a memory location in which data is stored. This means that a pointer holds the memory address of another variable. Put another way, the pointer does not hold a value in the traditional sense; instead, it holds the address of another variable. A pointer "points to" that other variable by holding a copy of its address. Because a pointer holds an address rather than a value, it has two parts. The pointer itself holds the address and that address points to a value.
Pointer declaration is shown below. You start by specifying the type of data stored in the location identified by the pointer. The asterisk tells the compiler that you are creating a pointer variable. Finally you give the name of the variable.
Data-type *variable-name

Such a variable is called a pointer variable. When we define a pointer variable we do so by preceding its name with an asterisk. In C, we also give our pointer a type which, in this case, refers to the type of data stored at the address we will be storing in our pointer. For example, consider the variable declaration: 

int *ptr;
int k;

ptr is the name of our variable (just as k is the name of our integer variable). The '*' informs the compiler that we want a pointer variable. The int says that we intend to use our pointer variable to store the address of an integer.
Referencing means taking the address of an existing variable (using &) to set a pointer variable. In order to be valid, a pointer has to be set to the address of a variable of the same type as the pointer, without the asterisk. For example in following code p1 references c1 as shown
int  c1; int *p1; c1 = 5;   p1 = &c1;

Dereferencing means accessing the variable value stored at a memory address. It is also called as indirection operator. For example in following code p dereferencing i as shown below
int i = 5; int *p; p = &i;
*p = 7; //*p returns the variable stored at the memory address         stored in p, which is i. i is now 7


  
Pointers like call-by-reference also can be used to modify one or more variables in the caller or to pass pointers to large data objects to avoid the overhead of passing the objects by call-by-value. We can use pointers and the indirection operator to simulate call-by-reference. When calling a function with arguments that should be modified, the addresses of arguments are passed. This is accomplished by applying the address operator (&) to the name of the variable whose value will be modified as shown in following code: 

















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