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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. typedef struct tm_ymd_641_t
  5. {
  6. 	int y;
  7. 	int m;
  8. 	int d;
  9. } tm_ymd_641;
  10.  
  11. int leapyear(int year)
  12. {
  13. 	return (((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0)) ? 1 : 0);
  14. }
  15.  
  16. int eom(const tm_ymd_641 date)
  17. {
  18. 	static const int daysinmonth[2][12] =
  19. 	{
  20. 		{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
  21. 		{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
  22. 	};
  23. 	return daysinmonth[leapyear(date.y)][date.m - 1];
  24. }
  25.  
  26. int iseom(const tm_ymd_641 date)
  27. {
  28. 	return date.d == eom(date) ? 1 : 0;
  29. }
  30.  
  31. int isvaliddate(const tm_ymd_641 date)
  32. {
  33. 	return 1 <= date.m && date.m <= 12 && 1 <= date.d && date.d <= eom(date) ? 1 : 0;
  34. }
  35.  
  36. tm_ymd_641 parse_date(char date[])
  37. {
  38. 	tm_ymd_641 ymd_date;
  39.  
  40. 	ymd_date.d = atoi(&date[6]);
  41. 	date[6] = '\0';
  42. 	ymd_date.m = atoi(&date[4]);
  43. 	date[4] = '\0';
  44. 	ymd_date.y = atoi(date);
  45.  
  46. 	return ymd_date;
  47. }
  48.  
  49. int main(void)
  50. {
  51. 	char date[9];
  52. 	tm_ymd_641 ymd;
  53.  
  54. 	printf("YYYYMMDD:");
  55. 	scanf("%s", date);
  56. 	ymd = parse_date(date);
  57. 	if (!isvaliddate(ymd))
  58. 	{
  59. 		puts("Input date is invalid!");
  60. 		abort();
  61. 	}
  62. 	if (iseom(ymd))
  63. 	{
  64. 		if (ymd.m == 12)
  65. 		{
  66. 			ymd.y++;
  67. 			ymd.m = 1;
  68. 		}
  69. 		else
  70. 		{
  71. 			ymd.m++;
  72. 		}
  73. 		ymd.d = 1;
  74. 	}
  75. 	else
  76. 	{
  77. 		ymd.d++;
  78. 	}
  79. 	printf("Next day is %d/%d/%d\n", ymd.y, ymd.m, ymd.d);
  80.  
  81. 	return 0;
  82. }
  83.  
Success #stdin #stdout 0.01s 1724KB
comments (?)
stdin 
20120913
stdout 
YYYYMMDD:Next day is 2012/9/14
https://ideone.com/Uqz8Y
language:
C (gcc 8.3)
created:
11 years ago
visibility:
secret

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