C Programming - Pointers - Discussion

I have confusion with printing values using * and &. Any one please tell me what's the actual meaning of those as well as how we can print values of multiple pointers using * and & ?

++p increments it to next address i.e pink.

**p+1.

** refers to p which is double reference(refers to a pointer pointing to another pointer).

**p+1 increments its value by 1(pointer p point to an array of characters s[]), So moves to next element of array 'i'.

In this problem we have an array of char pointers pointing to start of 4 strings. Then we have ptr which is a pointer to a pointer of type char and a variable p which is a pointer to a pointer to a pointer of type char. p hold the initial value of ptr, i.e. p = s+3. The next statement increment value in p by 1 , thus now value of p = s+2. In the printf statement the expression is evaluated *++p causes gets value s+1 then the pre decrement is executed and we get s+1 " 1 = s.

the indirection operator now gets the value from the array of s and adds 3 to the starting address. The string is printed starting from this position. Thus, the output is \'ck\'.

I run this program in the turbo C++. But I get the output as " nk " . can anyone tell me why?. The code is,

static char *s[] = {"black", "white", "pink", "violet"};
char **ptr[] = {s+3, s+2, s+1, s}, ***p;
p = ptr;
++p;
printf("%s", **p+1);

The second line char **ptr[] = {s+3,s+2,s+1,s};

Reverse the original string whose first element is violet and pointed by *ptr.

Then ++p made it to point pink(second element).

At last **p+1 points to the string from second alphabet of 'pink'.

Why pointers are to be used?

To access the elements efficiently in different methodologies and execution speed is faster.

What is the use of ** (double star) , *** (triple stars) , if you don't mind, please explain me?

What is the value of *ptr and ptr in the program? please give me the explanation?

What does **ptr and ***ptr means? why do we use them? can someone please explain?