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Is this a pointer to a pointer? The instants is one most should be familiar with.
is argv a pointer to a pointer?Code:#include <stdio>
#include <string>
int main(int argc, char** argv)
{
int i;
for(i = 0; i < argc; i++)
{
printf("%s\n", argv[i]);
}
return 0;
}
is there such a thing as a pointer to a pointer?
Yes, it is a pointer to a pointer.
Well, it's a pointer to char*, and what is char*? Well, it is a pointer to char... so that makes it pointer to pointer to char... doesn't it?
This technique is very useful to point to an array element of which contains a string. Did you happen to note how the arguments to main are defined?
skringla obviously did ;)Quote:
Originally Posted by slingerland3g
My bad, sorry skringla!Quote:
Originally Posted by laserlight
Thats all right. I am still trying to grasp the hole pointer concept. I don't completely understand it and every time I think I do the techniques I think would work with pointers don't compile. I am fine working in a system of pointers that is already built (like gtk toolkit) but when I try to build a system for my self it just doesn't work. I will have to go over the tutorials again, but no one seems to be able to explain the things with out making it confusing. At least I have some working knowledge of them at this point.
http://cboard.cprogramming.com/showp...3&postcount=31
http://cboard.cprogramming.com/showp...65&postcount=4
Two analogies that might help.
Pointers are really simple. Everything left to the * is the type it points to.
or seen another way its a pointer to an array of pointers, or an array of pointers, it all depends on what it is ultimately pointign too, but yes, its a pointer to a pointer.
Here's a good pointer video for beginners:
http://cslibrary.stanford.edu/104/
Lol, I love the part where binky tries to use his magic wand of dereferencing on an unassigned pointer. Makes me want to teach C/C++ in high school just so I can show that video :)Quote:
Originally Posted by stevesmithx