/*
Program to demonstrate pointers (int array)
Version 1.0 / 2001.09.01.
Peter Schindler pstrainer@gmx.net
*/
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>

/*	Declaration of globals	*****************************/
void suba (int ix[]);
void subb (int *px);

/*	Main program	*************************************/
void main (void){
int i,ia[100];
int *pia;

printf("Pointer Test Program\n\n");
//	init array ai
for (i=0;i<100;i++) {ia[i]=i*2;}
//	set pointer pia to the address of ia
pia=&ia[0];

// send array (pointer!) to subroutine
printf("main01");	// print elements
for (i=0;i<8;i++) {printf("%5d",ia[i]);}
printf("\n");

suba(ia);

printf("main02");	// print elements
for (i=0;i<8;i++) {printf("%5d",ia[i]);}
printf("\n\n");

//	send pointer to subroutine
printf("main03");	// print elements
for (i=0;i<8;i++) {printf("%5d",ia[i]);}
printf("\n");

subb(pia);

printf("main04");	// print elements
for (i=0;i<8;i++) {printf("%5d",ia[i]);}
printf("\n\n");

printf("End of program\n");
_getch();
}

/*	Get integer array and change it (add 10) **********************/
void suba (int ix[]) {
int i;

printf("suba01");	// print elements
for (i=0;i<8;i++) {printf("%5d",ix[i]);}
printf("\n");

for (i=0;i<5;i++) {ix[i]+=10;}	// change elements of array

printf("suba02");	// print elements
for (i=0;i<8;i++) {printf("%5d",ix[i]);}
printf("\n");
}

/*	Get pointer to int array, change it (add 200) **************/
void subb (int *px) {
int i;

printf("subb01");	// print elements
for (i=0;i<8;i++) {printf("%5d",*(px+i));}
printf("\n");

for (i=0;i<5;i++) {*(px+i)+=200;}	// change elements of array

printf("subb02");	// print elements
for (i=0;i<8;i++) {printf("%5d",*(px+i));}
printf("\n");
}

/*	eof	************************************************/