convert char * to int?

calorie712 · 05-01-2006, 02:18 AM

I am working on a program and I read in from a file a position which is a number. I am using strtok() to get my data from the file. I want to do this:

tourndata[x].position = tokenPtr;

here is how they are declared:

char *tokenPtr;

struct tourndata{
char name[25];
char handle[25];
int position;
};

I get a compiler error that says "invalid conversion from char * to int".

how can I convert the tokenPtr to an int? Or if you have any other ideas feel free to comment.

Thanks.

scoban · 05-01-2006, 02:22 AM

atoi() will do the job i think.

kalleanka · 05-01-2006, 03:14 AM

or cast it (int)

tourndata[x].position = (int) tokenPtr;

ioerror · 05-01-2006, 03:21 AM

Why do you want do cast it anyway? Maybe it would be easier to make position into a char *. If not, then kalleanka has given you the answer.

Quote:

atoi() will do the job i think.

Nope, wrong context.

kalleanka · 05-01-2006, 03:24 AM

IOerror got a point!

Its a bad thing to cast since it can giv faulty code. Better to fix the code so the types fits.

calorie712 · 05-01-2006, 03:32 AM

When I read in the position from the text file I use tokenPtr to point to it. Then I want to use it as an int in my program and then output it back to the text file as an int when I am done. Don't you think atoi would work good for this purpose?

ioerror · 05-01-2006, 04:38 AM

I'm still not clear on exactly what you're trying to do. Is the number a string of digits in the file, or is it just the file position, a pointer to some offset into the file?

In the former case, I misunderstood you at first and scoban was correct, although I would suggest strtol instead of atoi, since atoi does not catch errors. In the latter case, then do as kalleanka and I suggested, either change position to a char *, or cast it, if you must.