explore.c

String Pointers to explore how the pointer work

/* explore.c: program to explore memory locations via pointers
   bob wilson
   10/29/2004
   */

#include <stdio.h>

int a = 0x11111111;
static int b = 0x22222222;

void foobar(int, int, int *, int *);

int main(void)
{
	static int c = 0x33333333;
	int d = 0x44444444;
	int *ap = &a;
	int *bp = &b;
	int *cp = &c;
	int *dp = &d;
	int array[1] = {0x55555555};

/* add code here to print the address of array[0]  */

	printf("address of array[0] = %08p\n", array);

/* add code here to print the variables a, b, c, d and pointers  */

	printf("a  = %08x, b  = %08x, c  = %08x, d  = %08x\n", a, b, c, d);
	printf("ap = %08p, bp = %08p, cp = %08p, dp = %08p\n", ap, bp, cp, dp);

/* add code here to print array[i] for i = 0 to high enough value */
/* print out the array index, value of address, and the value */
	
	int i;
	for (i= 0; i < 6; i++)
	   printf("%3d, %08p, %08x\n", i, &array[i], array[i]);

/* call function foobar and pass arguments  */
	foobar(a, d, &a, &d);

	return;
}

void foobar(int x, int y, int *xp, int *yp)
{
	int array[1] = {0x66666666};
	
	printf("Entering foobar\n");
/* add code here to print array[i] for i = 0 to high enough value */
/* print out the array index, value of address, and the value */

	printf("auto variable array = %p\n", array);
	int i;
	for (i = 0; i < 40; i++)
	   printf("%3d, %08p, %08x\n", i, &array[i], array[i]);

	return;
}