Indirection

Code:

---

#include <iostream>
using namespace std;
void changevalue(int *value);
main()
{
        int value[10];
        changevalue(value);
        for(int x=0; x<10; x++)
        {
                cout<<value[x]<<endl;//why does this line work...
        }
        return 0;
}
void changevalue(int *value)
{
        for(int x=0; x<10; x++)
        {
                value[x]=x+1;
        }
}

---

i commented a line...why does that work, when this also works..

Code:

---

#include <iostream>
using namespace std;
void changevalue(int *value);
main()
{
        int value[10];
        changevalue(value);
        for(int x=0; x<10; x++)
        {
                cout<<*value;//why the need for indirection?
        }
        return 0;
}
void changevalue(int *value)
{
        for(int x=0; x<10; x++)
        {
                value[x]=x+1;
        }
}

---

why do i need indirection for value (*value) but when i call it as an element from the array, there is no need for the indirection. as in, why does this not work, but the second portion of code does.

Code:

---

#include <iostream>
using namespace std;
void changevalue(int *value);
main()
{
        int value[10];
        changevalue(value);
        for(int x=0; x<10; x++)
        {
                cout<<*value[x]<<endl;//error
        }
        return 0;
}
void changevalue(int *value)
{
        for(int x=0; x<10; x++)
        {
                value[x]=x+1;
        }
}

---

Thanks.

value[x] is a variable. (An integer).
value is a pointer to value[0]. (An address).

This makes dealing with string arrays easier, because you often can pass the pointer to a string (or any array) to a function.