reading digits from a text file

Hello,

I'm learning c myself (not c++, I'm trying not to use objects)

I have have a bunch of text files (created by a perl program)

They contain a bunch of letters and random numbers from 0 to 9
I'm only interested in the numbers and nothing else

here's and example of the contents (i just made it up)

5 7 2 4 6
0 2 E D
0 A D E
6 D D
7 D K
5 F

How do I go about loading just the numbers into an array?
so I want an array that that has

5 7 2 4 6 0 2 0 6 7 5

Basically the above is an example, there can be more per line and more lines, but I just need the numbers.

Any examples/help appricated

Assuming that this is for a school assignment, I'll try to provide the proper kind of assistance.

First of all, think of how large you should make your array when the program starts. Once it's made, it can't be changed unless you make a new one and copy contents over.

To read the characters from the file, have a look at the fscanf manpage.

There is a function that you will find very useful for this assignment in ctype.h.

As far as how to easily navigate your array or file, have a look in your text book's index under "pointer arithmetic".

Hope this helps,

~arker

Thanks for your input.

lol not for a school assignment, bit to old for school lol. Just picked up a c programming book and giving it a shot

Read each character from the file, then use the isdigit() function in ctype.h to determine whether its a numeric char

Quote:

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Originally posted by Salem
Read each character from the file, using fgetc() then use the isdigit() function in ctype.h to determine whether its a numeric char

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... or learn to compare the values by hand, testing if they are between '0' and '9'. I'd suggest for practice write your program both ways.