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  1. #include <stdio.h>
  2. int get_day(int yyyy, int mm);
  3. int get_day_of_month(int yyyy, int mm);
  4. int is_leaf_year(int yyyy);
  5. void print_cal(int start_day, int day_num);
  6. int main(void)
  7. {
  8.     int yyyy, mm; scanf("%d%d",&yyyy, &mm);
  9.     int start_day = get_day(yyyy, mm);
  10.     int day_num = get_day_of_month(yyyy, mm);
  11.     print_cal(start_day, day_num);
  12. }
  13. void print_cal(int start_day, int day_num)
  14. {
  15.     printf(" Sun Mon Tue Wed Thu Fri Sat\n");
  16.     for(int i = 0; i < start_day; i++)
  17.         printf("    ");
  18.     for(int day = 1, ke = start_day; day <= day_num; day++, ke++)
  19.     {
  20.         printf("%4d",day);
  21.         if(ke%7 == 6)
  22.             printf("\n");
  23.     }
  24. }
  25. int get_day(int yyyy, int mm)
  26. {
  27. 	int past = 0;
  28. 	for(int y=1; y<yyyy; y++)
  29. 		past = past + 365 + is_leaf_year(y);
  30. 	for(int m=1; m<mm; m++)
  31. 		past = past + get_day_of_month(yyyy, m);
  32. 	return (1 + past) % 7;
  33. }
  34. int get_day_of_month(int yyyy,  int mm)
  35. {
  36.     int day_of_month[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
  37.     day_of_month[2] += is_leaf_year(yyyy);
  38.     return day_of_month[mm];
  39. }
  40. int is_leaf_year(int yyyy)
  41. {
  42. 	if(yyyy % 400 == 0)
  43. 		return 1;
  44. 	if((yyyy % 100 != 0) && (yyyy % 4 == 0))
  45. 		return 1;
  46. 	return 0;
  47. }
Success #stdin #stdout 0s 5304KB
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2020 2
stdout
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 Sun Mon Tue Wed Thu Fri Sat
                           1
   2   3   4   5   6   7   8
   9  10  11  12  13  14  15
  16  17  18  19  20  21  22
  23  24  25  26  27  28  29
https://ideone.com/BOHxm2
language:
C++14 (gcc 8.3)
created:
30 days ago
visibility:
public

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