/
@author jelathro
@date 2/19/13
Provide various examples of pointers
and how pointers work.
/
int main(void){
// Basic pointers and Basic addresses
int basic_pointer;
int basic_value;
// Give value a literal value
basic_value = 'A';
// Assign pointer to address
// of literal value in value
basic_pointer = &basic_value;
printf("pointer is at address %p\n", &basic_pointer);
printf("value at address of pointer is %c\n\n", *basic_pointer);
// More advanced use of pointers
// Array's are just fancy pointers
char array[5] = {'a', 'A', 'b', 'z', 'M'};
char *same_array = array;
char **fancy_same_array = &same_array;
jadavmadhavkumar
commented
2 years ago
#include <stdio.h>
/ @author jelathro @date 2/19/13 Provide various examples of pointers and how pointers work. / int main(void){ // Basic pointers and Basic addresses int basic_pointer; int basic_value;
// Give value a literal value basic_value = 'A'; // Assign pointer to address // of literal value in value basic_pointer = &basic_value;
printf("pointer is at address %p\n", &basic_pointer); printf("value at address of pointer is %c\n\n", *basic_pointer);
// More advanced use of pointers // Array's are just fancy pointers char array[5] = {'a', 'A', 'b', 'z', 'M'}; char *same_array = array; char **fancy_same_array = &same_array;
printf("array[3] = %c, addr = %p\n", array[3], &array[3]); printf("same_array[3] = %c, addr = %p\n", same_array[3], &same_array[3]); printf("*fancy_same_array[3] = %c, addr = %p\n", (fancy_same_array)[3], &(*fancy_same_array)[3]);
// char arrays are also just a "string" // of characters. printf("array string %s, addr = %p\n", array, &array); printf("same array string %s, addr = %p\n", same_array, &same_array); printf("fancy array string %s, addr = %p\n\n", (fancy_same_array), &(fancy_same_array));
// Arrays of pointers char ptr_array[2]; char ptr1 = NULL, *ptr2 = NULL; char char_elements[2] = {'H', 'i'};
ptr1 = &char_elements[1]; ptr2 = char_elements;
ptr_array[0] = ptr2; ptr_array[1] = ptr1; printf("ptr_array = %c\n", ptr_array); printf("addr at ptr_array = %p\n", &(ptr_array)); printf("addr at ptr_array[0] = %p\n\n", &(ptr_array[0])); printf("ptr_array[1] = %c\n", ptr_array[1]); printf("addr at ptr_array[0] = %p\n", &(ptr_array)); printf("addr at *ptr_array[0] = %p\n", &(*ptr_array)); printf("addr at ptr_array[1] = %p\n", &(*ptr_array[1]));
return 0; }