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Home > Forums > Programmers > Languages > C Forum

if i have a file with input as

Read More Threads Like This One

niru1972 (Programmer)

14 Feb 01 20:38

if i have a file
with input as

one
two
three

how can i do str=fgets(buf, 30, file) what should i declare str as?

zBuilder (MIS)

17 Feb 01 17:02

You could do this:

char *str;
char buf[33];
FILE *file;
// open the file here so file points to a valid handle...

str=fgets(buf, 30, file);

And then check str for NULL to see if fgets failed or not.

Kim_Christensen@telus.net
http://www3.bc.sympatico.ca/Kim_Christensen/index.html

rbobbitt (Programmer)

21 Feb 01 0:43

Also, when you call fgets, it makes for better maintenance to use sizeof instead. And there's a chance that the user entered a line that was too long for your buffer, you will probably want to check for this too:

char buf[33];
FILE *file;

/* Open the file */

if (NULL==fgets(buf, sizeof buf, file)) {
    /* fgets() failed, handle error */
} else {
    char *tmp=strchr(buf,'\n');
    if (NULL!=tmp) {
       /* success, get rid of the newline */
       *tmp='\0';
    } else {
        /* line was truncated, handle accordingly */
    }
}

Russ
bobbitts@hotmail.com
http://home.earthlink.net/~bobbitts

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