C Language Applet calculates the date of the second day sample code

Enter a date to determine which day the next date is, and if the date is entered incorrectly, invoke the CAL command under Linux to display the entered month copy code code as follows:


#include <stdio.h>


#include <stdlib.h>


#include <string.h>


#include <time.h>


int, month, day;


const int day_30 = 30;


const int day_31 = 31;


int day_month_2 = 0;


char err_flag = 0;


void Compute ()


{


printf ("Enter Month Day (1992-7-19):");


scanf ("%d-%d-%d", &year, &month, &day);


if (year%4==0 && year%100!=0) | | (year%400==0))


 {


day_month_2 = 29;


 }


Else


 {


day_month_2 = 28;


 }


if (month>=1 && month<=12)


{


if (month = 2)


  {


if (Day > day_month_2)


   {


Err_flag = 1;


   }


else if (day = = day_month_2)


   {


month++;


day = 1;


   }


Else


   {


day++;


   }


  }


else if (month==1 | | month==3 | | month==5 | | month==7 | |


Month==8 | | month==10 | | MONTH==12)


  {


if (Day > Day_31)


   {


Err_flag = 1;


   }


else if (day = = day_31)


   {


month++;


day = 1;


   }


Else


   {


day++;


   }


  }


Else


  {


if (Day > Day_30)


   {


Err_flag = 1;


   }


else if (day = = day_30)


   {


month++;


day = 1;


   }


Else


   {


day++;


   }


  }


if (Month > 12)


  {


year++;


month = 1;


  }


 }


Else


 {


Err_flag = 1;


 }


}


int main ()


{


time_t now;


Char ch, c;


Char call_cal[30];


do


 {


compute ();


if (err_flag)


  {


err_flag = 0;


printf ("Date input error, call Cal Command query%d years%d months: nn", year, month);


sprintf (call_cal, "/usr/bin/cal%d%d", month, year);


system (call_cal);


//system ("clear");


while ((C=getchar ())!= ' n ' && (C=getchar ())!=eof);


printf ("Re-enter (y/n):");


  }


Else


  {


printf ("The next day is%d-%d-%d.") N ", year, month, day);


while ((C=getchar ())!= ' n ' && (C=getchar ())!=eof);


printf ("Enter the date Again (y/n):");


  }


ch = getchar ();


 }


while (ch== ' y ' | | | | ch== ' y ' | | | ch== ' n ');


time (&now);


printf ("Now is%s", CTime (&now));


puts ("having a goodday!");


return 0;


}