URL / format fix 1996/schweikh1/README.md

1996/schweikh1/README.md

@@ -1,20 +1,32 @@
 # Worst Abuse of the C Preprocessor
 
-    Jens Schweikhardt
+Jens Schweikhardt   
-    DFN Network Operation Center
+DFN Network Operation Center  
-    Schlartaeckerweg 3 (home address)
+Schlartaeckerweg 3 (home address)  
-    D-71384 Weinstadt
+D-71384 Weinstadt  
-    Germany
+Germany  
-
+<http://www.schweikhardt.net>  
-    http://www.uni-stuttgart.de/People/schweikhardt/home.html
 
 ## To build:
 
-        make all
+```sh
+make all
+```
 
 ## To run:
 
-	./schweikh1
+```sh
+./schweikh1
+```
+
+## Try:
+
+To find the day that Easter falls on in the current year:
+
+```sh
+./schweikh1 |grep $(date +%Y)
+```
+
 
 ## Judges' remarks:
 
@@ -27,18 +39,18 @@ C Preprocessor that the judges have seen this year!
 
 ## Author's remarks:
 
-What this program does
+### What this program does
-----------------------
 
 This program is an implementation of an algorithm that calculates
 the date of the Sunday following the first full moon after the
-spring equinoxe. (Also known as "Easter", defined this way by the
+spring equinox. (Also known as "Easter", defined this way by the
 Nicaean Concilium in 325 Anno Domini.) The algorithm is attributed
 to the famous mathematician Carl Friedrich Gauss ["Meyers Handbuch
 ueber das Weltall", Meyer, 5th Edition, 1973, p149] and is suitable
 for anni domini within the Gregorian Calendar, that is, from 1582 AD
 to 2199 AD: 
 
+```
 Let J be the year.
 If J is from 1582 to 1699, let M be 22, let N be 2
 If J is from 1700 to 1799, let M be 23, let N be 3
@@ -51,29 +63,37 @@ Let c be the modulus of J divided by 7
 Let d be the modulus of (19a + M) divided by 30
 Let e be the modulus of (2b + 4c + 6d + N) divided by 7
 
+```
+
 The interesting Sunday is either:
 
-        March 22 + d + e   or
+```
-        April d + e - 9    (only one of them is a valid date)
+March 22 + d + e   or
+April d + e - 9    (only one of them is a valid date)
+``` 
 
 with the following exceptions:
 
-        April 26 must always be changed to April 19
+```
-        April 25 must be changed to April 18 if d is 28 and a greater than 10
+April 26 must always be changed to April 19
+April 25 must be changed to April 18 if d is 28 and a greater than 10
+```
 
 ### Example:
 
-	J = 1962, M = 24, N = 5
+```
-        a = J % 19 = 5
+J = 1962, M = 24, N = 5
-        b = J %  4 = 2
+a = J % 19 = 5
-        c = J %  7 = 2
+b = J %  4 = 2
-        d = 119 % 30 = 29
+c = J %  7 = 2
-        e = 191 % 7 = 2
+d = 119 % 30 = 29
+e = 191 % 7 = 2
+```
 
-March 53 is invalid, so the result is April 22 1962
+March 53 is invalid, so the result is April 22 1962.
 
-Why I think this is obfuscated
+
-------------------------------
+### Why I think this is obfuscated
 
 Apart from the calculation of the Easter date, the definition *and*
 calculation of which are obfuscations in their own right,
@@ -101,22 +121,22 @@ Try to be as precise as can be and no one will comprehend what you mean.
 #### The formula:
       
 
-	comprehension = 1/(2**precision)
+```
+comprehension = 1/(2**precision)
+```
 
 #### The interpretation:
 
 "Say nothing and everybody will understand."
 
 The `-I/usr/include` in the build file is needed by gcc on Solaris because
-gcc's "fixed" header in gcc-lib/sparc-sun-solaris2.5/2.7.2/include/errno.h
+`gcc`'s "fixed" header in `gcc-lib/sparc-sun-solaris2.5/2.7.2/include/errno.h`
-is broken (sort of) because it has *two* identical extern
+is broken (sort of) because it has *two* identical extern declarations of errno.
-declarations of errno. This leads to an error due to the
+This leads to an error due to the redefinition of main. The `-I` option makes
-redefinition of main. The `-I` option makes sure the working
+sure the working /usr/include/errno.h is found first, which shouldn't cause any
-/usr/include/errno.h is found first, which shouldn't harm on other
+problems on other systems.
-systems. 
 
-Usage
+### Usage
------
 
 The program is run without arguments. It prints all dates in order.