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  1. #define _CRT_SECURE_NO_WARNINGS
  2. #include <conio.h>
  3. #include <stdio.h>
  4. #include <string.h>
  5. #include <time.h>
  6.  
  7. #define WEEK	"日 月 火 水 木 金 土"
  8. #define COL	24
  9.  
  10. char disp[8][80];
  11.  
  12. void strfmt(void* dest, char* fmt, int i)
  13. {
  14. 	char		buf[8];
  15.  
  16. 	sprintf(buf, fmt, i);
  17. 	memcpy(dest, buf, strlen(buf));
  18. }
  19.  
  20. void calsub(int year, int month, int col)
  21. {
  22. 	struct tm	tm;
  23. 	struct tm*	ptm;
  24. 	time_t		timer;
  25. 	int		line;
  26. 	int		i;
  27.  
  28. 	if (month < 1) {
  29. 		year--;
  30. 		month += 12;
  31. 	}
  32. 	if (12 < month) {
  33. 		year++;
  34. 		month -= 12;
  35. 	}
  36. 	strfmt(disp[0] + col * COL, "%d", year);
  37. 	strfmt(disp[0] + col * COL + 8, "%d月", month);
  38. 	memcpy(disp[1] + col * COL, WEEK, strlen(WEEK));
  39.  
  40. 	memset(&tm, 0, sizeof tm);
  41. 	tm.tm_year	= year - 1900;
  42. 	tm.tm_mon	= month - 1;
  43. 	tm.tm_mday	= 1;
  44. 	timer = mktime(&tm);
  45. 	line = 2;
  46. 	for (i = 1; i <= 31; i++) {
  47. 		ptm = localtime(&timer);
  48. 		if (ptm->tm_mon != month - 1) {
  49. 			break;
  50. 		}
  51. 		if (ptm->tm_wday == 0 && 1 < i) {
  52. 			line++;
  53. 		}
  54. 		strfmt(disp[line] + col * COL + ptm->tm_wday * 3, "%2d", i);
  55. 		timer += 24 * 60 * 60;
  56. 	}
  57. }
  58.  
  59. void cal(int year, int month)
  60. {
  61. 	int		i;
  62.  
  63. 	for (i = 0; i < 8; i++) {
  64. 		memset(disp[i], ' ', 79);
  65. 		disp[i][79] = '\0';
  66. 	}
  67. 	calsub(year, month - 1, 0);
  68. 	calsub(year, month, 1);
  69. 	calsub(year, month + 1, 2);
  70. 	for (i = 0; i < 8; i++) {
  71. 		printf("%s\n", disp[i]);
  72. 	}
  73. }
  74.  
  75. int main()
  76. {
  77. 	time_t		timer;
  78. 	struct tm*	ptm;
  79. 	int		year;
  80. 	int		month;
  81. 	int		ch;
  82. 	int		flag;
  83.  
  84. 	time(&timer);
  85. 	ptm = localtime(&timer);
  86. 	year = ptm->tm_year + 1900;
  87. 	month = ptm->tm_mon + 1;
  88. 	while (1) {
  89. 		cal(year, month);
  90. 		printf("ESCキーで終了\n");
  91. 		do {
  92. 			ch = _getch();
  93. 			flag = 0;
  94. 			switch (ch) {
  95. 			case 0x1b:	// ESC
  96. 				return 0;
  97. 			case 0x48:	// up
  98. 				month -= 3;
  99. 				break;
  100. 			case 0x49:	// PageUp
  101. 				year--;
  102. 				break;
  103. 			case 0x4b:	// left
  104. 				month--;
  105. 				break;
  106. 			case 0x4d:	// right
  107. 				month++;
  108. 				break;
  109. 			case 0x50:	// down
  110. 				month += 3;
  111. 				break;
  112. 			case 0x51:	// PageDown
  113. 				year++;
  114. 				break;
  115. 			case 0xe0:
  116. 			default:
  117. 				flag = 1;
  118. 			}
  119. 		} while (flag);
  120. 		if (month < 1) {
  121. 			year--;
  122. 			month += 12;
  123. 		}
  124. 		if (12 < month) {
  125. 			year++;
  126. 			month -= 12;
  127. 		}
  128. 	}
  129. 	return 0;
  130. }
  131.  
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https://ideone.com/0By6S
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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