Problem with fopen in xcode (C)

[chasely]

Hello all, I'm having a very frustrating time with this piece of code. For some reason, I can't seem to open the file I'm trying to read data in from. This piece of code works in everything I've tried, except xCode. This wouldn't bother me, but I really only use my laptop for coding, so I need it to work in xCode.

The debugger stops at the fopen command line, like it can't find the file.

If any of you can give me any help I would really appreciate it. I've included the original code and a screenshot of the XCode setup.

/*
What is wrong with this in xcode?
*/


#include <stdlib.h>
#include <time.h>
#include <stdio.h>

int main() {

FILE *fp;
int tokens;
int wager;
int CompDie;
int UserDie;

fp = fopen ("data.txt","r");
srand((int)time(NULL) + 1);

fscanf (fp, "%d", &tokens);

printf ("%d", tokens);
fclose (fp);

printf ("Description\n");

printf ("What is your wager\n");
scanf ("%d", &wager);

UserDie = (rand() % 6) + 1; /* produce a random number 1 to 6 */
CompDie = (rand() % 6) + 1; /* what is the % used for? */

printf ("User: %d Computer: %d", UserDie, CompDie);

if (UserDie > CompDie)
tokens = tokens + wager;
if (CompDie > UserDie)
tokens = tokens - wager;

printf ("Tokens left: %d", tokens);

fp = fopen ("data.txt","w");
fprintf (fp, "%d", tokens);
fclose (fp);

return 0;

}

 

[mgb_phys]

It stopped because you set a breakpoint?
Press f5 (or whatever in xcode) or clear the breakpoint.

 

[chasely]

Thanks for that advice. That fixed one problem, but brought up another...

When compiling I get a "signal 10 (SIGBUS)" error. I looked it up and according to "Step Into Xcode"...

"In a C program, this almost always means that a proper value has not been supplied for a pointer."

I've gone through it and found that I get the error in the fscanf command...this is just the simple line I tried to compile...

Any more help would be appreciated. I hate spending time on these computer using problems, I'd much rather spend my time learning to write code!

/*
What is wrong with this in xcode?
*/

#include <stdio.h>

int main() {

FILE *input;
int tokens;


input = fopen ("data.txt","r");

fscanf (input, "%d", &tokens);

return 0;

}

 

[mgb_phys]

Check the return from fopen, input will be null if the open failed.
if ( input = fopen("data.txt","r") ) { fscanf(input...) }

My guess would be that xcode puts the build in a debug subdir and data.txt is in the current dir.

 

[chasely]

Check the return from fopen, input will be null if the open failed.
if ( input = fopen("data.txt","r") ) { fscanf(input...) }

My guess would be that xcode puts the build in a debug subdir and data.txt is in the current dir.

You sir, have made my week.

You were correct. The program puts the code in a debug subdir where the data file was not. If I move the data file to the subdir, all is fine.

Although that is somewhat inconvenient to do, it solves my problems for the near future.

 

[mgb_phys]

There is probably an option in the debug setup somewhere to set the starting directory for the debug session.