Format User Input When using strings

Unregistered · 03-07-2002

Hi, could somebody help me with a simple task.
This section of my program asks the user to enter a date, simple enough. The problem is theres nothing to stop the user from entering more than two characters for each part of the date and messing up the rest of the screen

Eg. theres nothing stopping the user entering 12345646435465435354643456431654 in for Day which only wants 12.

Is there any way to 'format' or restrict the amount of letters the user enters or to move to the next section or loop around once two nubers are entered?

Note: I want to keep the 3 variables characters(no integars).
Tab and Display menu are other functions I wrote in my program.
Tab just clears text to the amount passed down to it. Eg. Tab(2) will clears two spaces.

/************************************************** */

char Day[3], Month[3], Year[3];

gotoxy(20,10); cprintf("Enter Date : ");
gotoxy(22,12); cprintf("[____] / [____] / [____]");
gotoxy(23,14); cprintf("[ [DD] / [MM] / [YY] ]");
gotoxy(22,18); cprintf("[ Press RETURN key To Quit ]");

/* Get Day */
do{ // Repeat
gotoxy(24,12); Tab(2); // Clear line of text
gotoxy(24,12); gets(Day); // Get Day for Date

if(strcmp(Day, "") == 0) // If entered RETURN key
Display_Menu(); // Go to Main Menu
}while( (atoi(Day) > 31)||(atoi(Day)<= 0)); // While day is invalid

/* Get Month */
do{ // Repeat
gotoxy(33,12); Tab(2); // Clear line of text
gotoxy(33,12); gets(Month); // Get Month for Date

if(strcmp(Month, "") == 0) // If entered RETURN key
Display_Menu(); // Go to Main Menu
}while((atoi(Month)>12)||(atoi(Month)<=0)); // While month is invalid

/* Get Year */
do{ // Repeat
gotoxy(42,12); Tab(2); // clear line of text
gotoxy(42,12); gets(Year); // Get Year for Date

if(strcmp(Year, "") == 0) // If entered RETURN key
Display_Menu(); // Go to Main Menu
}while((atoi(Year) > 20)&&(atoi(Year) <= 96)); // While year is invalid

/************************************************** */

Steve.

**Prelude** · 03-07-2002

Take the input and validate it, if the user enters something wrong then tell them and try to input again.

Code:

/* pseudocode */
for ( ; ; ) { /* forEVER */
  Print the input request
  if ( day > DAYLIMIT )
    Print error
  else if ( month > MONTHLIMIT )
    Print error
  else if ( year > YEARLIMIT )
    Print error
  else 
    /* Date is correct, bail */
    break;
}

Of course you may need to test differently, but it's the same idea.

-Prelude

**Brian** · 03-07-2002

Code:

scanf("%2d",&integer);

only puts the first 2 numbers in the integer

**steve** · 03-08-2002

I understand, that but its not that the code is wrong, it reasks to enter the date if its wrong, thats fine. I have a screen function which gets messed up when the user enters too many digits.

What do I do?

**bigtamscot** · 03-08-2002

Hi, enter date as a string..character at a time..

Code:

printf("Enter date in format DDMMYY");

for(i = 0; i < 6; i++)
{
     if( i < 2) dd[i] = getch();
     else if (i < 4) mm[i] = getch();
     else  yy[i] = getch();
}
/* don't forget to add null chars */

good thing is any validation that is required can be done as user enters date

Code:

/* in the loop */
   if(i < 2) {
        dd[i] = getch();
        if(!isdigit(dd[i]))
        {
            printf("Invalid entry - try again");
            i--;
         }
    /* rest of code */

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