Re: Newbie Questions

Re: Newbie Questions

[Daniel]

1) if you can use cin.getline(), for parameters see in doc
2) to convert you can use atoi-i for int (const char *) or atol - l for
long,
    see man atoi, also you have to include stdlib (man tells you the needed
header also)
3) include <time.h> and use gmtime, it returns a pointer to a struct with
all information
    you will not need to convert the year at all, it is in this struct .(as
member)
4) I don't know what is wrong, but try it in this way
    int c;
    while((c=fgetc(pF))!=EOF){// it reads first from file, c is an int !!}
Ok , good luck

----- Original Message -----
From: "The Gyzmo" <gyzmobro@linuxfreemail.com>
Newsgroups: ka.lists.linux.c.programming
Sent: Sunday, April 07, 2002 3:57 AM
Subject: Newbie Questions


> Hello. I'm new to C and I'm working on an age program. I have some
> questions:
>
> 1) Gcc tells me that the gets() function is dangerous and should not be
> used - which function could I replace gets() with that does exactly the
> same thing?
>
> 2) In my program, I want to calculate the age of people from their birth
> date whithout having to make the user input the current year. Which time
> funciton should I use to get the year and if it outputs a string, how
> would I convert that string to an integer?
>
> 3) One of the goals of my program is to input birth dates from a
> database file, display them all, and then find the average. I have a
> 'while(!feof(fp))' loop that takes each line in the file and extracts
> the birth dates and counts how many entries there are in the file, but
> it loops one too many times - that is it also loops after it reaches the
> EOF. This results in 2 of the same entry being displayed and the counter
> for how many entries there are being 1 too high. Which function can I
> use to loop only before it reaches the EOF?
>
> Thanks for any help in advance,
> Serban Giuroiu
>
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Re: Newbie Questions

[Gyzmobro]

Linux Free Mail has been down so I haven't had a chance to respond to this 
thread and am now forced to use a proprietary email system. I hope I haven't 
missed parts of this thread and I don't have the last email, but here I go:

From what you've said, I would have to write a while loop that goes through
the file one line at a time and checks to see if it's
at the EOF through an if statement. How would I make
the program go through the file line by line? Is this 
if statement right:?

char c_check_eof[10];

if(fgets(c_check_eof, 10, fp) == "EOF")
{
 break;
}

Serban Giuroiu

Re: Newbie Questions

[Glynn Clements]

Gyzmobro@aol.com wrote:

> Linux Free Mail has been down so I haven't had a chance to respond to this 
> thread and am now forced to use a proprietary email system. I hope I haven't 
> missed parts of this thread and I don't have the last email, but here I go:
> 
> >From what you've said, I would have to write a while loop that goes through
> the file one line at a time and checks to see if it's
> at the EOF through an if statement. How would I make
> the program go through the file line by line? Is this 
> if statement right:?
> 
> char c_check_eof[10];
> 
> if(fgets(c_check_eof, 10, fp) == "EOF")
> {
>  break;
> }

No. It should be:

	char line[80];	/* large enough to hold one line of input */

	...

	for (;;) {
		if (!fgets(line, sizeof(line), fp))
			break;

		/* if we get here, "line" holds one line of input */
		...
	}

-- 
Glynn Clements <glynn.clements@virgin.net>