validating a date month and year format

**bazzano** · 08-15-2005

Hi guys im having trouble with validating user input for a date formal as

dd/mm/yyyy

I am using sscanf() function to read in the values but as soon as it hits the sscanf() function it reads the integer values but does not go and execute the next lines so it can validate the day,month, and years ranges using the if statements. Any idea's?

Code:

if ( sscanf( buff, "%d/%d/%d", &date, &month, &year ) == 3 ) 
  {
 
    if((date <=0) && (date>31))
    {
         printf("please enter the date again!");
    }

    if(month <0 && month>12)
    {
         
         printf("enter the months again please!");
    }

    if(year <1970 && year>2005)
    {

       printf("please enter the year again!");
    }

  }

**~~ILoveVectors~~** · 08-15-2005

i dont know much about that cause im a c++ programmer mainly,
but no one has put a answer so ill just take a guess.

%d i thought that was for double's?

maybe %i would make a difference?

if nto maybe you could try

%i%c%i%c%i

where c would be for character and take the / off,
but like i said i dont know how it works, id imagine
it just read to the next int if you dont put the %c,
but it just my guess.

and just out of curiosity what is the / for in the %d/%d/%d
i could be wrong but i dont think the / are suppose to be there?

**bazzano** · 08-16-2005

thanks for that the / is just so that when the user inputs the date
they input the integer and a slash then another integer and a slash

eg 00/00/0000

**Dave_Sinkula** · 08-16-2005

Originally Posted by bazzano

I am using sscanf() function to read in the values but as soon as it hits the sscanf() function it reads the integer values but does not go and execute the next lines so it can validate the day,month, and years ranges using the if statements. Any idea's?

Are you sure it's not getting there?

Code:

#include <stdio.h>

int main(void)
{
   char buff[] = "16/8/2005\n";
   int date, month, year;
   if ( sscanf( buff, "%d/%d/%d", &date, &month, &year ) == 3 )
   {
      printf("date = %d, month = %d, year = %d\n", date, month, year);
   }
   return 0;
}

/* my output
date = 16, month = 8, year = 2005
*/

Originally Posted by ILoveVectors

%d i thought that was for double's?

No, %d is not for doubles -- it is for ints. For *scanf, %d specifies base 10; with %i the expected format "is the same as expected for the subject sequence of the strtol function with the value 0 for the base argument." (A double uses %lf with *scanf.)

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