Code:
/****************************************************************************
* This function prompts the user for a 10-character date of birth in
* dd/mm/yyyy format. The system date is extracted with the assistance of the
* time.h header file. This function reports how many days old the user is.
* Dates of birth after the current date are rejected.
****************************************************************************/
void ageCalculator()
{
char buff[BUFSIZ];
struct tm t;
time_t now;
int m,d,y;
char input [MAXDATE]; /* buffer size is 12 */
int valid = 0;
int date[3]; /* 0 = day 1= month 2=year*/
char *day, *month, *year;
int dayr, monthr, yearr;
/* declaration of variables */
time(&now);
/* put now into time */
t = *localtime(&now);
/* get the current date */
strftime(buff, sizeof(buff), "%d//%m//%y", &t);
/* format the date*/
/* --- printing the date ---- */
printf("The current date is %s\n",buff);
printf("\nPlease Enter your age in dd/mm/yyyy format:");
fgets(input, MAXDATE, stdin);
do
{
if ( fgets ( input, sizeof input, stdin ) != NULL )
{
valid = 0;
}
if ( sscanf ( input, "%d/%d/%d", &m, &d, &y ) == 3 )
{
if ( is_valid ( m, d, y ) )
{
printf ( "\n\n%d/%d/%d is a valid date\n", m, d, y );
valid = 1;
}
}
else
{
printf ("\nInvalid date please enter in dd/mm/yyyy format:");
valid = 0;
}
}
while(!valid);
day = strtok(input, "/");
if (day) printf("%s\n", day);
month = strtok(NULL, "/");
if (month) printf("%s\n", month);
year = strtok(NULL, "/");
if (year) printf("%s\n", year);
loopyear();
dayr = strtok(buff, "/");
if (dayr) printf("%s\n", dayr);
dayr = atoi(buff);
monthr = strtok(NULL, "/");
if (monthr) printf("%s\n", monthr);
monthr = atoi(buff);
yearr = strtok(NULL, "/");
if (yearr) strtok(NULL, "/"); printf("%s\n",yearr);
yearr = atoi(buff);
}
int is_valid ( int m, int d, int y )
{
static const int mday[] =
{
0,31,28,31,30,31,30,31,31,30,31,30,31
};
if ( m <= 0 || m > 12 )
return 0;
else if ( d <= 0 || d > mday[m] )
return 0;
else if ( y < 1900 || y > 3000 ) /* Arbitrary choices */
return 0;
return 1;
}
int loopyear()
{
int days = 0;
int leapdays;
int nonleapdays;
int year;
leapdays = year % 4;
nonleapdays = year % 100;
days = leapdays - nonleapdays;
printf("\n%d number of days",days);
return days;
}
