Pointers

Pointer to Pointer

• A pointer to pointer is a pointer in which we can store address of a pointer.
• By using pointer to pointer we can access a variable pointed by other pointer.
• A pointer to pointer can be defined by using.

  #include<stdio.h>
  main()
  {
    int a=5,*p,**q;
    p=&a;
    q=&p;
    printf("\n%d ",a);
    printf("\n%d ",*p);
    printf("\n%d ",**q);
    a++;
    (*p)++;
    (**q)++;
    printf("\n%d %d %d",a,*p,**q);
  }

5
5
5
8 8 8
  

Array of Pointer

• If we want to store multiple addresses of different items then array of pointer can be used.
• An array of pointer can be defined by using
• It will create an array of size number of elements in which we can store addresses of variables of specified data type.

  #include<stdio.h>
  main()
  {
    int a=5,b=11,c=8,d=55,e=188,f=14,g=33;
    int *p[7]={&a,&b,&c,&d,&e,&f,&g};
    int max;
    int i;
    max=*p[0];
    for(i=1;i<=6;i++)
        if(*p[i]>max)
            max=*p[i];
    printf("Greatest No is %d",max);
  }

Greatest No is 188
  

Pointer to an Array | Array Pointer

• It is pointer in which we can store address of an array.
• A pointer to an array can be defined by using .
• It will create a pointer in which we can store address of an array of specified size.

• float (*p)[10];
• char (*q)[10];

  #include<stdio.h>
  main()
  {
    char arr[3][10]={"Amit","Gopal","Raj"};
    char (*p)[10];
    int i;
    p=arr;
    for(i=0;i<3;i++)
    {
        printf("%s\n", p);
        p++;
    }
  }

Amit
Gopal 
Raj