Pointer question

[aewarnick]

[code]#include <iostream>
#include <cstdlib>
void funk(int *);
const int size=8;
int arr[size]={7,6,8,1,4,3,6,2};

int main()
{
funk(arr);

system("PAUSE");
return 0;
}

void funk(int *a){
for (int j=0; j<size; ++j)
if (a[j]> a[j+1]) cout<<a[j]<<" ";
}[\code]

Why doesn't this part: if (a[j]> a[j+1]) cout<<a[j]<<" "; have to have * before a?

[parksie]

a[i] is equivalent to *(a + i). The [] operator automatically dereferences, by selecting a specific index into a pointed-at memory location.

[aewarnick]

What other operators do that?

[parksie]

Um, none. [] is the array-index operator, and that's all it does. I don't see what you want here.

[aewarnick]

I just want to understand everything becuase if I don't I will be lost.

I know they are not formatted correctly.

This program works fine without ++*p

#include <iostream>
#include <cstdlib>
#include <cctype>
void UP(char *, int *);
int main() { char n[50]="hi 5T/+f"; int g=2;    UP(n, &g);    cout<< n<< g;
system("PAUSE");    return 0;}

void UP(char *p, int *d) {
while (*p!='\0') { *p=toupper(*p);    ++p; }   *d=*d * *d; }

This one doesn't:

#include <iostream>
#include <cstdlib>
#include <cctype>
void UP(int *);
const int size=5;

int main()
{
int n[size]={2, 3, 3, 7, 8};

UP(n);
for (int i=0; i<size; i++)
cout<<n[i]<<endl;
system("PAUSE");
return 0;
}

void UP(int *p){
for (int i=0; i<size; i++){
*p=p[0] + p[1];
++*p;
}}

[transcendental]

The second program ++*p increment the contents of what p points to, while the first program increment the pointer p.

I just want to understand everything becuase if I don't I will be lost.

True.

[aewarnick]

Thank you.