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Pattern #170
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#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;
}
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