function problem

Unregistered · 07-09-2002

below is part of the function i wrote, I tried editing it to give an error when there is no data in the file but cant... can anyone help?
the case switch is displaying the below, but when there is no data in the file it just do nothing, i want to have an error or msg saying "no file or record" when they try to display an empty file.

PHP Code:




void display_rec(void)

{

    int index;

    float total_fee;





    for(index=0;index<count;++index)

    {

        clrscr();

        mainpage();

        gotoxy(27,8); printf("@ Display Member Record @");

        gotoxy(27,9); printf("~~~~~~~~~~~~~~~~~~~~~~~~~");

        gotoxy(20,11); printf("Member First Name : %s\n", mem[index].mem_fname);

        gotoxy(20,12); printf("Member Last Name  : %s\n", mem[index].mem_lname);

        gotoxy(20,13); printf("Member NRIC No.   : %s\n", mem[index].mem_nric);

        gotoxy(20,14); printf("Member Address    : %s\n", mem[index].mem_address);

        gotoxy(20,15); printf("Member Gender     : %s\n", mem[index].mem_gen);

        gotoxy(20,16); printf("Member Birth Date : %s\n", mem[index].mem_dob);

        gotoxy(20,17); printf("Member Contact No.: %s\n", mem[index].mem_tel);

        gotoxy(20,18); printf("Amount Paid Per Month : $%.2f\n", mem[index].mem_installp);

        gotoxy(20,19); printf("No. Of Months Paid : %i\n", mem[index].mem_month);

         total_fee=mem[index].mem_installp*mem[index].mem_month;

        gotoxy(20,21); printf("Total amount Paid is $ %.2f\n", total_fee);





    //    gotoxy(20,22); printf("Amount left to be Paid is $");

        gotoxy(23,24);

        printf("Press Enter key to view more record");

        getchar();

        fflush(stdin);

        clrscr();

    }



}

***ClownPimp*** · 07-09-2002

assuming that count will equal 0 when there is no data in the file, just stick an if-statement after the for-loop with the condition that 'count == 0' that prints an errror message if the condition is true

**sturm100** · 07-09-2002

hmmm, will try that, i have keep looking on the index instead just now, forgot i can use the count loop.

THanks will try and see if successful.

**Kelvin** · 07-09-2002

count is undefined variable?

**sturm100** · 07-09-2002

my count is undefine, but the program still run smoothly though.. do i need to define my count?

i still trying to figure the if (count==0).... or there is some problem with my program?

**sturm100** · 07-09-2002

i dun think is working....

**Hammer** · 07-09-2002

Originally posted by Kelvin
count is undefined variable?

The variable count is not defined in the code you have given above. If your code compiles, then it means that the count variable must be defined elsewhere (it's probably a global variable).

Here's some sample code to do the if statement. Put it just before the for loop.

Code:

if (count <= 0)
{
     printf ("No data!\n");
     getchar();
     return;
}

And, don't do this
>fflush(stdin);
it's undefined behaviour and therefore not good! (fflush is for output streams only)

**sturm100** · 07-09-2002

sometime if i dun put fflush(stdin) the enter key will carry over to the next function, anyway else to prevent this?

**sturm100** · 07-09-2002

hey hammer, thanks

finally your answer brings me light!! i din put in the return just now
no wonder cant work
thanks

**shaik786** · 07-09-2002

>sometime if i dun put fflush(stdin) the enter key will carry over to the next function, anyway else to prevent this?

Code:

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

**sturm100** · 07-09-2002

sometime if i dun put fflush(stdin) the enter key will carry over to the next function, anyway else to prevent this?

**Prelude** · 07-09-2002

>anyway else to prevent this?
Please don't post the same question twice. Especially after it's been answered.

-Prelude

**sturm100** · 07-09-2002

sorry accidently click on back , on my browser and it just repost everything

**Hammer** · 07-09-2002

Originally posted by shaik786
>sometime if i dun put fflush(stdin) the enter key will carry over to the next function, anyway else to prevent this?

Code:

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

You can also do it slightly easier with this:
>while(getchar() != '\n');
It's the same thing, it just doesn't use a variable to store the return of getchar() in (no point in having one, if you're not going to use it).

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