This is a C Program which computes the date of Easter Sunday. |

**Here is the algorithm by Carl Friedrich Gauss :**

**Here is the algorithm by Carl Friedrich Gauss :**

Step 1 : Let Y be the year

Step 2 : Divide Y by 19 to get a remainder as A

Step 3 : Divide Y by 100 to get a quotient B and a remainder C

Step 4 : Divide B by 4 to get a quotient D and a remainder E

Step 5 : Divide (8*B+13) by 25 to get a quotient G

Step 6 : Divide (19*A+B-D-G+15) by 30 to get a remainder H

Step 7 : Divide C by 4 to get a quotient J and a remainder K

Step 8 : Divide (A+11*H) by 319 to get a quotient M

Step 9 : Divide (2*E+2*J-K-H+M+32) by 7 to get a remainder R

Step 10: Divide (H-M+R+90) by 25 to get a quotient N

Step 11: Divide (H-M+R+N+19) by 32 to get a remainder P

So for a given year Y Easter Sunday falls on day P and month N

Step 2 : Divide Y by 19 to get a remainder as A

Step 3 : Divide Y by 100 to get a quotient B and a remainder C

Step 4 : Divide B by 4 to get a quotient D and a remainder E

Step 5 : Divide (8*B+13) by 25 to get a quotient G

Step 6 : Divide (19*A+B-D-G+15) by 30 to get a remainder H

Step 7 : Divide C by 4 to get a quotient J and a remainder K

Step 8 : Divide (A+11*H) by 319 to get a quotient M

Step 9 : Divide (2*E+2*J-K-H+M+32) by 7 to get a remainder R

Step 10: Divide (H-M+R+90) by 25 to get a quotient N

Step 11: Divide (H-M+R+N+19) by 32 to get a remainder P

So for a given year Y Easter Sunday falls on day P and month N

PROGRAM :

#include <stdio.h> #include <stdlib.h> int main() { int y; printf("Enter Year :\t"); scanf("%d",&y); if(y <= 0) printf("\nPlease enter a valid Year\n"); else { int a =y%19; int b = y/100; int c = y%100; int d = b/4; int e = b%4; int g = (8*b+13)/25; int h =(19*a+b-d-g+15)%30; int j = c/4; int k = c%4; int m = (a+11*h)/319; int r = (2*e+2*j-k-h+m+32)%7; int n = (h-m+r+90)/25; int p = (h-m+r+n+19)%32; printf("\n\nEaster Sunday for year %d is ",y); switch(n) { case 1: printf("January %d\n" ,p); break; case 2: printf("February %d\n" ,p); break; case 3: printf("March %d\n" ,p); break; case 4: printf("April %d\n" ,p); break; case 5: printf("May %d\n" ,p); break; case 6: printf("June %d\n" ,p); break; case 7: printf("July %d\n" ,p); break; case 8: printf("August %d\n" ,p); break; case 9: printf("September %d\n" ,p); break; case 10: printf("October %d\n" ,p); break; case 11: printf("November %d\n" ,p); break; case 12: printf("December %d\n" ,p); break; default: printf("Invalid ,TRY AGAIN !!" ); } } return 0; }

OUTPUT :

C Program for computing Easter Sunday |

C Program for computing Easter Sunday |