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C ptrs

Ptr

Ptr2ptr

Void ptr

Fn ptr

Void ptr fn (not like void ptr)

Pointer to an array

Array of ptrs

 

 Int *p;

 There will be a memory space reserved for 2 bytes which can store address of integer type.

 &p represents address of the pointer variable. Mostly we won’t use this..

P = &somevariable

That Is P will gives the address of the variable it points to.

*p= some value , will make somevariable to assign some value.

 We can have **p ,***p,****p so on…

 Always p can hold some address of int type…

 Int in int *p implies the somwvariable value is of int type…

 Char in char *p implies somevariable value is of char type…

 Void in void *p implies the somevariable can be of any type.. it is known only at run time…

 We can also have pointer functions…

 Consider a function int p(int a) that returns ‘a’ value

Int (*ptf) (int) = &p; // the braces are mandatory…

 also we can call like ptf = p;

 We can invoke the function by 2 way..

 P(2);

(*ptf) (2);

 Both will return 2 as output.

 

these thing will work fine in laptop memory

sample program

# include

# include

 

 void func1(int (*a)[10][10])

{

printf("%d  ",a);

}

void func2(int a[][][])

{

printf("%d",a);

}

 

 

int main()

{

int a[10][10][10],b[10];

printf("%d   ",a);

func1(a);

func2(a);

 

getch();

return 0;

}

 

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