Understanding Pointers to Pointers and Double Dereferencing in C, Exercises of Computer Fundamentals

Download Understanding Pointers to Pointers and Double Dereferencing in C and more Exercises Computer Fundamentals in PDF only on Docsity! #include <stdlib.h> #include <stdio.h> /* * This program basically demonstrate how to use pointer to a pointer and * use of double dereference operator. */ int main (int argc, char *argv[]) { int i,a=0; int *ptr_a; // pointer to int int **ptr_ptr_a; // pointer to a pointer of type int //code to see double dereferencing. printf("Memory address of a is %p \n",&a); ptr_a=&a; // ptr_a points to variable a printf("ptr_a stores Memory address of a is %p\n",ptr_a); printf("Memory address of ptr is %p\n",&ptr_a); *ptr_a=5; // changing value of a using ptr_ptr_a printf("\n printing value using ptr_a a=%d \n",*ptr_a); ptr_ptr_a=&ptr_a; // ptr_ptr_a points to another pointer ptr_a printf("ptr_ptr_a stores Memory address of ptr_a is %p\n",ptr_ptr_a); printf("Memory address of ptr_ptr_a is %p\n",&ptr_ptr_a); **ptr_ptr_a=11; // changing value of a using ptr_ptr_a printf("\n printing value using ptr_ptr_a a=%d \n",**ptr_ptr_a); return 0; } docsity.com