Pointers

[ncode]

I read something about pass a pointer to a function. And it state that there're four way of passing it:

• non-constant pointer to non-constant data
• constant pointer to nonconstant data
• non-constant pointer to constant data
• constant pointer to constant data

So, what does non-constant pointer and constant pointer means?

[laserlight]

So, what does non-constant pointer and constant pointer means?

For example:

int *p1 = 0;

p1 is a non-constant pointer; you can point it elsewhere later.

int *const p2 = 0;

p2 is a constant pointer; its value cannot be changed.

[ncode]

oo ok thanks. Didn't figure it out it's cause by const. Thanks