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  1. #include <stdio.h>
  2.  
  3. int is_uruu(int year){
  4. 	if(year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)){
  5. 		return 1;
  6. 	}
  7. 	return 0;
  8. }
  9.  
  10. int maxday_of_month(int y, int m){
  11. 	if(m==1 || m==3 || m==5 || m==7 || m==8 || m==10 || m==12){
  12. 		return 31;
  13. 	}
  14. 	else if(m==4 || m==6 || m==9 || m==11){
  15. 		return 30;
  16. 	}
  17. 	else if(m == 2 && is_uruu(y) == 1){
  18. 		return 29;
  19. 	}
  20. 	else{
  21. 		return 28;
  22. 	}
  23. }
  24.  
  25. int days_from(int y, int m, int d){
  26. 	int ans=0, i;
  27. 	for(i=1;i<=m-1;i++){
  28. 		ans += maxday_of_month(y,i);
  29. 	}
  30. 	ans--;
  31. 	ans += d;
  32. 	return ans;
  33. }
  34.  
  35. int days_from_1900_1_1(int y, int m, int d){
  36. 	int ans=0, i;
  37. 	for(i=1900;i<=y-1;i++){
  38. 		ans += days_from(i,12,31) + 1;
  39. 	}
  40. 	ans += days_from(y,m,d);
  41. 	return ans;
  42. }
  43.  
  44. int what_day(int y, int m, int d){
  45. 	switch(days_from_1900_1_1(y,m,d)%7){
  46. 		case 0:
  47. 			return 1;
  48. 			//月曜
  49. 		case 1:
  50. 			return 2;
  51. 		case 2:
  52. 			return 3;
  53. 		case 3:
  54. 			return 4;
  55. 		case 4:
  56. 			return 5;
  57. 		case 5:
  58. 			return 6;
  59. 		case 6:
  60. 			return 0;
  61. 	}
  62. }
  63.  
  64. void calendar(int y, int m){
  65. 	printf("Su Mo Tu We Th Fr Sa\n");
  66. 	int first = what_day(y,m,1), i;
  67. 	for(i=0;i<first;i++){
  68. 		printf("   ");
  69. 	}
  70. 	for(i=1;i<=maxday_of_month(y,m);i++){
  71. 		printf("%2d ",i);
  72. 		if((i + first) % 7 == 0){
  73. 			printf("\n");
  74. 		}
  75. 	}
  76.  
  77. }
  78.  
  79. int main(void) {
  80. 	int y=2025, m=4;
  81. 	calendar(y,m);
  82. 	return 0;
  83. }
Success #stdin #stdout 0.01s 5324KB
comments (?)
stdin
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Standard input is empty
stdout
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Su Mo Tu We Th Fr Sa
       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 30
https://ideone.com/gRbAPm
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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