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Oh, so it's one's complement? I'll have to re-read that section. I really need to get a copy of "The C Answer Book" ;)

Thanks again, I really appreciate the help.

This is such a great book, I...

I have not seen the ~0 or ~value before, where is that coming from? I have seen ~1 used to set boolean values before. I see how it works and it seems straigh forward but I would like to know more...

Got it! Thanks, I wrote out some sample code and tested the effects. I don't think I have ever read about that before, handy to know.

Where is the ~0UL coming from, is it part ot stdbool or something else. Thanks for the reply.

printf("%lu", ~0UL);

Can someone explane how this is working? Seems like this could be really handy to understand.

That is very helpful as are many of the suggestions. I guess I really don't understand stdbool. The man page it not particularly illuminating.

Thanks for the help.

How do I get printf to display the value?

In this case I am trying to figure out in code of the largest possible value of an unsigned long int. The problem is that if I just do the math 2^(whatever) i am bound to exceed the size of the value...

Could I take the stuff poped off the stack as chars and then check if they are operators? If not put them in temp ints and preform math on them? Problem I see with that is I am only checking a very...

Read the wikipedia stuff.

Does that ASCII solution still work for an input with larger numbers?

13241
184781
+

Can you tell me how this would look in RPN: 9 (4 - 2) / 4

Hey, I was just wondering if anyone could give me some suggestion on writing an RPN calc? I am using a double llist lib that I wrote to push and pop. Can anyone suggest how I can decide if I am...

I get an output like this when i time some functions

I will try %g and see what i get.

Yes... Thanks! I feel like a real n00b now.
edit: I just changed my output to printf to %f and I get 0.00000 also, same as the guy above. Suggestions?
edit edit: Never mind, i got it.

yeah, i know. I was just showing the syntax i am using. It is not mean as a exaple of my implimentation. Sorry i didn't make that clear and thanks for the suggestion.

Can someone give me a quick example of using time.h to time how long something runs for?

i would like to output in human readable time.
I was doing this:


clock_t start = clock();

...

Thanks for the suggestion. I kind of forgot that scanf returns anything :/

So, my malloc ing looks ok?

-bash-3.1$ ./proj1 < 100000.txt
463480570
Array at 101 = 463480570
*** glibc detected *** ./proj1: realloc(): invalid next size: 0x0969a008 ***
======= Backtrace: =========...

#include <stdio.h>
#include <stdbool.h>
#include "project1.h"


int main()
{
int i, r, NUM_ITEMS, t, ret, ava;
int* numbers;
NUM_ITEMS = 0;

int i, r, NUM_ITEMS, t, ret;
int* numbers;
NUM_ITEMS = 0;


while(((ret = scanf("&#37;d",&t)) != EOF) && (ret != 0))
{
printf("%d\n",t);
numbers = malloc(1 * sizeof(int));...

This is what i have to do, I have everything else.

Thanks for the help.


int t;
while ( t != EOF )
{
scanf("&#37;d", &t);
printf("%d", t);
}

Alright, then what is the terminating char that I base my loop on? And way not just malloc and realloc int by int untill EOF?

I need to create an array from user input on the fly.

I am just wondering if anyone can tell me, how is c handeling the input for the command line like this:

./arraycreate < input_100.txt
...