Re: Reading input problem

arnuld wrote:
> I have a function named getword that read every single input from std.
> input.
> 
> WHAT I WANTED:  I want it read the word if it has less than or equal to
30
> characters. Anything else beyond that should be discarded and it should
> ask the user for new input.

Try this:

/* BEGIN fscanf_input.c */
/*
** There are only three different values
** that can be assigned to the int variable rc,
** from the fscanf calls in this program;
** They are:
**      EOF
**      0
**      1
** If rc equals EOF, then the end of file was reached,
** or there is some other input problem;
** ferror and feof can be used to distinguish which.
** If rc equals 0, then an empty line
** (a line consisting only of one newline character)
** was entered, and the array contains garbage values.
** If rc equals 1, then there is a string in the array.
** Up to LENGTH number of characters are read
** from a line of a text stream
** and written to a string in an array.
** The newline character in the text line is replaced
** by a null character in the array.
** If the line is longer than LENGTH,
** then the extra characters are discarded.
*/
#include <stdio.h>

#define LENGTH          30
#define str(x)          # x
#define xstr(x)         str(x)

int main(void)
{
     int rc;
     char array[LENGTH + 1];

     puts("The LENGTH macro is " xstr(LENGTH) ".");
     do {
         fputs("Enter any line of text to continue,\n"
             "or just hit the Enter key to quit:", stdout);
         fflush(stdout);
         rc = fscanf(stdin, "%" xstr(LENGTH) "[^\n]%*[^\n]", array);
         if (!feof(stdin)) {
             getc(stdin);
         }
         if (rc == 0) {
             array[0] = '\0';
         }
         if (rc == EOF) {
             puts("rc equals EOF");
         } else {
             printf("rc is %d. Your string is:%s\n\n", rc, array);
         }
     } while (rc == 1);
     return 0;
}

/* END fscanf_input.c */

-- 
pete