/* Referencing arrays using array and pointer notation */

#include <stdio.h>

main()
{
	static char text[] = "ABCD";

	printf("text[0]     = %c\n", text[0]);
	printf("*(text + 0) = %c\n", *(text + 0));
	printf("*(0 + text) = %c\n", *(0 + text));
	printf("*text       = %c\n", *text);
}

text[0]     = A
*(text + 0) = A
*(0 + text) = A
*text       = A




/* Referencing pointers using pointer and array notation */

#include <stdio.h>

main()
{
	char *ptext = "ABCD";

	printf("*ptext       = %c\n", *ptext);
	printf("*(ptext + 0) = %c\n", *(ptext + 0));
	printf("*(0 + ptext) = %c\n", *(0 + ptext));
	printf("ptext[0]     = %c\n", ptext[0]);
}

*ptext       = A
*(ptext + 0) = A
*(0 + ptext) = A
ptext[0]     = A




#include <stdio.h>

main()
{
	static int i[5] = {1, 2, 3, 4, 5};
	int *pi = &i[2];
	int j;

	for (j = -2; j <= 2; ++j)
		printf("pi[%2d] = %d\n", j, pi[j]);


	{
	char *table[] = {
		"red",
		"blue",
		"green"
	};

	printf("*table[1]       = %c\n", *table[1]);
	printf("*(table[1] + 0) = %c\n", *(table[1] + 0));
	printf("table[1][0]     = %c\n", table[1][0]);
	printf("table[2][4]     = %c\n", table[2][4]);
	}
}

pi[-2] = 1
pi[-1] = 2
pi[ 0] = 3
pi[ 1] = 4
pi[ 2] = 5
*table[1]       = b
*(table[1] + 0) = b
table[1][0]     = b
table[2][4]     = n





#include <stdio.h>
#include <stdlib.h>

main()
{
	int *pi;
	int i;

	pi = malloc(5);
	if (pi == NULL) {
		/* handle error */
	}

	for (i = 0; i < 5; ++i) {
		pi[i] = i * i;
		printf("pi[%d] = %d\n", i, pi[i]);
	}
}

pi[0] = 0
pi[1] = 1
pi[2] = 4
pi[3] = 9
pi[4] = 16





#include <stdio.h>

main()
{
	char a[10][20];
	void f(char [10][20]);

	f(a);
}

void f(char a[10][20])
{
	printf("sizeof(a) = %lu\n", 
		(unsigned long) sizeof(a));
	printf("sizeof(*a) = %lu\n", 
		(unsigned long) sizeof(*a));
	printf("sizeof(a[0]) = %lu\n", 
		(unsigned long) sizeof(a[0]));
	printf("sizeof(a[0][0]) = %lu\n", 
		(unsigned long) sizeof(a[0][0]));
}

sizeof(a) = 4
sizeof(*a) = 20
sizeof(a[0]) = 20
sizeof(a[0][0]) = 1




#include <stdio.h>

main()
{
	char a[10][20];
	char (*b)[20];
	void f(char (*)[20]);

	b = a;

	f(b);
}

void f(char (*a)[20])
{
	printf("sizeof(a) = %lu\n", 
		(unsigned long) sizeof(a));
	printf("sizeof(*a) = %lu\n", 
		(unsigned long) sizeof(*a));
	printf("sizeof(a[0]) = %lu\n", 
		(unsigned long) sizeof(a[0]));
	printf("sizeof(a[0][0]) = %lu\n", 
		(unsigned long) sizeof(a[0][0]));
}

sizeof(a) = 4
sizeof(*a) = 20
sizeof(a[0]) = 20
sizeof(a[0][0]) = 1




#include <stdio.h>

main()
{
	char c0;
	char c1[1];
	char c2[1][1];
	char c3[1][1][1];

	printf("sizes are = %lu, %lu, %lu, %lu\n", 
		(unsigned long) sizeof(c0),
		(unsigned long) sizeof(c1),
		(unsigned long) sizeof(c2),
		(unsigned long) sizeof(c3));
}