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  1. #include <stdio.h>
  2.  
  3. int Zeller(int year, int month, int day){
  4. 	if(month==1||month==2){
  5. 		year--;
  6. 		month+=12;
  7. 	}
  8.  
  9. 	int C=year/100;
  10. 	int Y=year%100;
  11.  
  12. 	int weekday=(day+(26*(month+1)/10)+Y+Y/4+5*C+C/4+5)%7;
  13. 	return weekday;
  14. }
  15.  
  16. int main(void){
  17. 	int year,month,day;
  18.  
  19. 	year=2021;
  20. 	month=9;
  21. 	day=17;
  22.  
  23. 	int weekday=Zeller(year,month,day);
  24.  
  25. 	printf("曜日番号(0=月曜~6=日曜):%d\n",weekday);
  26.  
  27. 	return 0;
  28. }
Success #stdin #stdout 0.01s 5288KB
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曜日番号(0=月曜~6=日曜):4
https://ideone.com/QvFUsS
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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