getchar()

Winter · 05-08-2002, 06:48 PM

how am I supposed to implement this function?

I used

getchar(cfever);

but it wont get a character to cfever.. and the complier spits this out:

exercise01.c: In function `main':
exercise01.c:70: too many arguments to function `getchar'

this is my code..

printf("\n Which of the following symptoms does"
"\n the patient have (Y for yes, N for no)"
"\n");

fever:

printf("\n Fever -------- ");
getchar(cfever)

switch (cfever) {

case 'y':
case 'Y':
fever = 1;
break;

case 'n':
case 'N':
fever = 0;
break;

default:
printf("\n Invalid Entry.");
goto fever;
break;
}

How can I get this to work? It is required to use getchar for character input..

~Winter

crabboy · 05-08-2002, 09:39 PM

Try:

Code:

while (ch = getchar())
{
   /* switch or if condition */

}

Use a while loop. Using a goto is nothing but trouble.

vfs · 05-09-2002, 09:06 AM

Useless observation:

The user has the BASIC fever? Y | y | yes | yessirebob | si

vfs.

Sfin · 05-09-2002, 04:42 PM

maybe try this:

char cfever;

cfever = getchar();

Winter · 05-10-2002, 03:37 PM

thats cool!

I need to clear the buffer though right?

while( (getchar()) != '\n');

how soon is it possible for me to do this?

as soon as cfever has the char stored in it?

does get char only retrieve 1 character and store it in cfever, or will it take the whole YES, YuP no and NOpE and store that in cfever?

heres a few questions for now..

me

crabboy · 05-10-2002, 11:10 PM

getchar() will only get one character at a time. You will need to call it in a loop to get more characters.

Unless you really want to use getchar() it may be easier to a string input function like fgets().

Code:

#include <stdio.h>

#define BUFF_SIZE 256

main()
{
   char szInputBuffer[BUFF_SIZE + 1];
   int iMatch = 0;

   fgets( szInputBuffer, BUFF_SIZE, stdin );

   if (( strncasecmp( "y", szInputBuffer, 1 ) == 0) ||
       ( strncasecmp( "yes", szInputBuffer, 3 ) == 0))
   {
      iMatch = 1;
   }
   printf("String is [%s]; iMatch is [%d]\n", szInputBuffer, iMatch );
}

wwnn1 · 05-11-2002, 02:49 AM

I try to modify you code.
Maybe it can work correctly!

/*********************** code ********************/

printf("\n Which of the following symptoms does"
"\n the patient have (Y for yes, N for no)"
"\n");

fever:

printf("\n Fever -------- ");
/* getchar(cfever) */
cfever = getchar(); /* input cfever */
getchar(); /* eat the "ENTER" character, this is important! */

switch (cfever) {

case 'y':
case 'Y':
fever = 1;
break;

case 'n':
case 'N':
fever = 0;
break;

default:
printf("\n Invalid Entry.");
goto fever;
break;
}