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  1. #include <stdio.h>
  2. #include <stdio.h>
  3. int is_uruu(int year){
  4. 	if((year%4==0 && year%100!=0)|| year%400==0){
  5. 		return 1;
  6. 	}
  7. 	else return 0;
  8. }
  9.  
  10. int maxday_of_month(int y, int m){
  11. 	int md;
  12. 	if(m==2){
  13. 		if(is_uruu(y)==1){
  14. 			md=29;
  15. 		}
  16. 		else md=28;
  17. 	}
  18. 	if(m==4||m==6||m==9||m==11){
  19. 		md=30;
  20. 	}
  21. 	if(m==1||m==3||m==5||m==7||m==8||m==10||m==12){
  22. 		md=31;
  23. 	}
  24. 	return md;
  25. }
  26. int days_from(int y, int m, int d){
  27. 	int sum=0,i;
  28. 	for(i=1;i<m;i++){
  29. 		sum=sum+maxday_of_month(y,i);
  30. 	}
  31. 	sum=sum+d;
  32. 	return sum;
  33. }
  34. int year_sum(int y,int m,int d){
  35. 	int sum=0,i;
  36. 	for(i=1900;i<y;i++){
  37. 		sum=sum+days_from(i,12,31);
  38. 		}
  39. 	sum=sum+days_from(y,m,d)-1;
  40. 	return sum;
  41. }
  42. int youbi(int y,int m,int d){
  43. 	if(year_sum(y,m,d)%7==0){
  44. 		return 1;
  45. 	}
  46. 	if(year_sum(y,m,d)%7==1){
  47. 		return 2;
  48. 	}
  49. 	if(year_sum(y,m,d)%7==2){
  50. 		return 3;
  51. 	}
  52. 	if(year_sum(y,m,d)%7==3){
  53. 		return 4;
  54. 	}
  55. 	if(year_sum(y,m,d)%7==4){
  56. 		return 5;
  57. 	}
  58. 	if(year_sum(y,m,d)%7==5){
  59. 		return 6;
  60. 	}
  61. 	if(year_sum(y,m,d)%7==6){
  62. 		return 0;
  63. 	}
  64. 	return 99;
  65. }
  66. int main(void) {
  67. 	int y,m,d;
  68. 	scanf("%d,%d,%d",&y,&m,&d);
  69. 	if(youbi(y,m,d)==0){
  70. 		printf("%d年%d月%d日は日曜日",y,m,d);
  71. 	}
  72. 	if(youbi(y,m,d)==1){
  73. 		printf("%d年%d月%d日は月曜日",y,m,d);
  74. 	}
  75. 	if(youbi(y,m,d)==2){
  76. 		printf("%d年%d月%d日は火曜日",y,m,d);
  77. 	}
  78. 	if(youbi(y,m,d)==3){
  79. 		printf("%d年%d月%d日は水曜日",y,m,d);
  80. 	}
  81. 	if(youbi(y,m,d)==4){
  82. 		printf("%d年%d月%d日は木曜日",y,m,d);
  83. 	}
  84. 	if(youbi(y,m,d)==5){
  85. 		printf("%d年%d月%d日は金曜日",y,m,d);
  86. 	}
  87. 	if(youbi(y,m,d)==6){
  88. 		printf("%d年%d月%d日は土曜日",y,m,d);
  89. 	}
  90. 	return 0;
  91. }
  92.  
Success #stdin #stdout 0.01s 5324KB
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2025,6,19
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2025年6月19日は木曜日
https://ideone.com/UbLmJH
2Q-1 3-4
language:
C99 (gcc 8.3)
created:
1 day ago
visibility:
public

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