1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4. #define MAX 80
  5.  
  6. int main()
  7. {   /*endlos schleife*/
  8.     while(1==1)
  9.     {
  10.     /*variablen definition*/
  11. 	int day, month,year, yearh, yearl , A, W;
  12.     /*eingabe*/
  13.     scanf("%02d.%02d.%04d", &day, &month, &year);
  14.  
  15. 	/*scanf("%i", &day);
  16. 	scanf("%i", &month);
  17. 	scanf("%i", &yearh);
  18. 	scanf("%i", &yearl);*/
  19.  
  20.  
  21.     /*abruch bedingungen*/
  22.  
  23.     if(month>12 || month<=0){
  24.                printf("FALSCHE ANGABE --> CRITICAL ERROR!\n");
  25.                system("PAUSE");
  26.                return 0;}
  27.     if(day>31 || day<=0){
  28.                printf("FALSCHE ANGABE --> CRITICAL ERROR!\n");
  29.                system("PAUSE");
  30.                return 0;}
  31.  
  32.     if(month==2 && day>29){
  33.                printf("FALSCHE ANGABE --> CRITICAL ERROR!\n");
  34.                system("PAUSE");
  35.                return 0;}
  36.     if(month==4|6|9|11 && day>30){
  37.                printf("FALSCHE ANGABE --> CRITICAL ERROR!\n");
  38.                system("PAUSE");
  39.                return 0;}
  40.    	if(year <1582 || (year ==1582 && month < 10) || (year ==1582 && month == 10 && day <15)){
  41. 		printf("Invalid Input");
  42. 		return 0;}
  43.  
  44.  
  45.     yearh = year/100;
  46. 	yearl = year%100;
  47.  
  48.     /*gauß monat array*/
  49.     int gm[] = {11,12,1,2,3,4,5,6,7,8,9,10};
  50. 	if(month == 1 || month == 2)
  51. 		{year--;}
  52.  
  53.  
  54. 	/* A = d + [2.6*m - 0.2] + y + [y/4] + [c/4] - 2*c */
  55. 	A = day + (2.6*gm[month-1]-0.2) + yearl + (yearl/4) + (yearh/4) - 2 * yearh;
  56.  
  57. 	printf("%i\n", W = A % 7);
  58.  
  59.     /*text ausgabe*/
  60.     if(W==1){
  61.          printf("Wochentag = Montag\n");}            
  62.     else if (W==2){
  63.          printf("Wochentag = Dienstag\n");}  
  64.     else if (W==3){
  65.          printf("Wochentag = Mittwoch\n");}
  66.     else if (W==4){
  67.          printf("Wochentag = Donnerstag\n");}
  68.     else if (W==5){
  69.          printf("Wochentag = Freitag\n");}
  70.     else if (W==6){
  71.          printf("Wochentag = Samstag\n");}
  72.     else if (W==0){
  73.          printf("Wochentag = Sonntag\n");}
  74.  
  75.  
  76. 	system("pause");}
  77. 	/*schleife ende ---> restart*/
  78. }
  79.