CppPracticum/date.c at master · alsayedaleks/CppPracticum · GitHub

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#include <stdio.h>

// 4.0.1 a) date
// 11.1a)
typedef struct {
  int day;
  int month;
  int year;
} Date;


int checkDate(const Date* x){
 int mas[12] ={31,28,31,30,31,30,31,31,30,31,30,31};

 if(x->year<1900 || x->year>2200) return -1;
 if(x->month<1 || x->month>12) return -2;
 if(x->day<0 || x->day>mas[x->month-1]) return -3;

 return 0;
}


 // input Date
int input(Date* x){

 scanf(" %d",&x->day); //x->day == (*x).day
 scanf(" %d",&x->month);
 scanf(" %d",&x->year);

 return 0;
}


void vyvod(const Date x){
  printf("\nDate= %2d.%2d.%4d",x.day,x.month,x.year);
}

// leap year if %4 and not %200
int leapYear(int year){
  return (year%4==0) && (year%200!=0);
}


Date yesterday(const Date x){

   int dayMonth[12] = {31,28,31,30,31,30,31,31,30,31,30,31};

   Date res = x;
   if(x.day>1){
      res.day--;
      return res;
    }

  if (x.month>1){
      res.month--;
      res.day = dayMonth[res.month-1];
      if(leapYear(x.year) && res.month==2) res.day=29;
      return res;
  }

  if (x.month==1){
      res.year--;
      res.month=12;
      res.day = 31;
     return res;
  }
  fprintf(stderr,"Yakas fignya");
  return res;
}


int main(){

   Date dat1;
   int r=-1;
   do{
     printf("Input date:");
    input(&dat1);
    if(checkDate(&dat1)==0) break;
  }while(1);

   vyvod(dat1);
   vyvod(yesterday(dat1));

   printf("\n");
   Date d1 = {23,2,2020};
   Date d2 = {1,1,2021};
   Date d3 = {1,5,2020};
   Date d4 ={1,3,2020};
   Date d5 ={1,3,2019};

 vyvod(yesterday(d1));
 vyvod(yesterday(d2));
 vyvod(yesterday(d3));
 vyvod(yesterday(d4));
 vyvod(yesterday(d5));

}


/*


int main(){

  Date x,y,z;
  input(&x);
  vyvod(x);
  y = yesterday(x);
 vyvod(y);
 // input(&y);
}
*/