last part of program i hope to validate

hi all,

have been troubling people here these few days, im finishing my program soon and hope to get the documentation done by end of this week. I have tested my program and theres one last thing left to do,,, validating my yes and no option...i went thru the forum and couldnt get my program to validate Y/N, if i use strcmp, i will need to change to %s, is there anyway to add a code so that %c can be validate to y and n only, thank you all

Code:

void add_rec(void)
{
 	char add_continue;
 	char ans;
 	add_continue = 'Y';
 	

 	do
 	{

 	gotoxy(26,23);
 	printf("Write to File (Y/N)?");
 	scanf("%c", &ans);
	fflush(stdin);


	if (toupper(ans) == 'Y');
 	{
		mem[count] = mem_temp; /*transfer temp data to array*/
		++count;
 	}
 		gotoxy(24,24);
 		printf("Enter next record (Y/N)?");
 		scanf("%c", &add_continue);
		fflush(stdin);


 	}
 	while (toupper(add_continue) == 'Y');


	}

How about this:

Code:

do{
     printf("Write to file? (Y/N) ");
     scanf("%c", &ans);
     if(ans='Y' || ans='y')
     {
          mem[count] = mem_temp;
          ++count;
          printf("Enter next record (Y/N)?");
          scanf("%c", &add_continue);
     }
     else
          break;
}while(add_continue='Y' || add_continue='y');

it seem like doesnt work
i press h still able to continue

#define CLEAN while (getchar() != '/n')

void add_rec(void)
{
char add_continue;
char ans;
/*add_continue = 'Y'; */

do
{
gotoxy(26,23);
printf("Write to File (Y/N)?");
scanf("%c", &ans);
CLEAN; /*fflush(stdin);*/

if (toupper(ans) == 'Y') /*you need remove the simicolon ';' here/*
{
mem[count] = mem_temp; /*transfer temp data to array*/
++count;
}
gotoxy(24,24);
printf("Enter C(ontinue) for Next record?");
scanf("%c", &add_continue);
CLEAN; /*fflush(stdin}*/
} while (toupper(add_continue) == 'C');

}
Hope it helps!
DV007

Actually i did try copy the whole code from netboy over to my program just now, it din seem to work, especially the y/n part, i din have time to work on it at the moment, its 3am in the morning, just found that i have not write the validation for the update case switch, hmmm time runnng short for me, maybe will skip a few validation to do documentation

anyway i will try your code tomorrow, see if it works. i was wondering if the y/n is limited to y/n? what if the user enter other characters, will it still accept? coz from the way its coded, i did not see any error msg regarding if user enter the wrong character. what i hope to attain is to only limit user to enter y or n, if others are enter, error msg will appear

Study this version... it contains a GetYesNo() function where the user is asked to enter Y or N.

It also allows the user to enter any word starting with a Y or N (eg Yes). It'd be easy enough to put a check in for additional characters if you wanted to.

Code:

#include <stdio.h>

#define YES 1
#define NO  0

int GetYesNo(char *);

int main(void)
{
    int Choice;

    Choice = GetYesNo("Would you like an icecream (y/n)? ");

    if (Choice == YES)
        printf("OK... here's chocolate one...\n");
    else
        printf("OK... bye then\n");

    return(0);
}

int GetYesNo(char *prompt)
{
    /*
	 *  This function will only return once the user
	 *  has entered Y or N.
	 */
    int c;
    int rc = -1;

    while (rc < 0)
    {
        printf("%s", prompt);
        c = getchar();
        switch (c)
        {
        case 'y':
        case 'Y':
            rc = YES;
            break;
        case 'n':
        case 'N':
            rc = NO;
            break;
        default:
            if (c != '\n')
                while (getchar() != '\n');
            break;
        }
    }

    if (c != '\n')
        while (getchar() != '\n');
    return(rc);
}

Actually I have been using the method that I posted earlier to validate any Y/N questions in my program...

I'm not sure why it won't work in your program. Can you try adding fflush(stdin); after the scanf statement?

Also if adding fflush statement still doesn't work, try using a string variable (%s) instead of single character variable (%c)... note that when scanning string to a %s variable, there will NOT be a '&' sign in front of the variable.

Tell me your result.

Thanks hammer, i look thru the code seem this may be what i want, will try to put it in use.

Netboy: thanks for your help too, somehow the #define CLEAN while (getchar() != '/n') => i think is '\n' rite?

coz both ways i tried, it will go to the next line when i did not key anything, and after that if i hit enter it will automatically accept it as a Yes,

seem like i have more to test, i think my switch case have some slight problem, may need to modify again.

thanks all

>I'm not sure why it won't work in your program. Can you try adding fflush(stdin); after the scanf statement?
No, don't that! fflush(stdin) is undefined, as the function is for out streams only, not input ones.