more readmes for the exams

subjects/displayalpham.md

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+# displayalpham
+## Instructions
+
+Write a program that displays the alphabet, with even letters in uppercase, and
+odd letters in lowercase, followed by a newline.
+
+The function must have the next signature.
+
+Example :
+
+```console
+student@ubuntu:~/student/displayalpham$ go build
+student@ubuntu:~/student/displayalpham$ ./displayalpham | cat -e
+aBcDeFgHiJkLmNoPqRsTuVwXyZ$
+student@ubuntu:~/student/displayalpham$ 
+```

subjects/displayalrevm.md

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+# displayalrevm
+## Instructions
+
+Write a program that displays the alphabet in reverse, with even letters in
+uppercase, and odd letters in lowercase, followed by a newline.
+
+The function must have the next signature.
+
+Example :
+
+```console
+student@ubuntu:~/student/displayalrevm$ go build
+student@ubuntu:~/student/displayalrevm$ ./displayalrevm | cat -e
+aBcDeFgHiJkLmNoPqRsTuVwXyZ$
+student@ubuntu:~/student/displayalrevm$ 
+```

subjects/lastword.md

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+# lastword
+## Instructions
+
+Write a program that takes a string and displays its last word, followed by a
+newline.
+
+A word is a section of string delimited by spaces/tabs or by the start/end of
+the string.
+
+If the number of parameters is not 1, or if there are no words, simply display
+a newline.
+
+Example :
+
+```console
+student@ubuntu:~/student/lastword$ go build
+student@ubuntu:~/student/lastword$ ./lastword "FOR PONY" | cat -e
+PONY$
+student@ubuntu:~/student/lastword$ ./lastword "this        ...       is sparta, then again, maybe    not" | cat -e
+not$
+student@ubuntu:~/student/lastword$ ./lastword "  " | cat -e
+$
+student@ubuntu:~/student/lastword$ ./lastword "a" "b" | cat -e
+$
+student@ubuntu:~/student/lastword$ ./lastword "  lorem,ipsum  " | cat -e
+lorem,ipsum$
+student@ubuntu:~/student/lastword$
+```

subjects/onlyz.md

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+# displayalpham
+## Instructions
+
+Write a program that displays a 'z' character on the standard output.

subjects/repeatalpha.md

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+# repeatalpha
+## Instructions
+
+Write a program called repeat_alpha that takes a string and display it
+repeating each alphabetical character as many times as its alphabetical index,
+followed by a newline.
+
+'a' becomes 'a', 'b' becomes 'bb', 'e' becomes 'eeeee', etc...
+
+Case remains unchanged.
+
+If the number of arguments is not 1, just display a newline.
+
+Examples:
+
+```console
+student@ubuntu:~/student/repeatalpha$ go build
+student@ubuntu:~/student/repeatalpha$ ./repeatalpha "abc" | cat -e
+abbccc
+student@ubuntu:~/student/repeatalpha$ ./repeatalpha "Alex." | cat -e
+Alllllllllllleeeeexxxxxxxxxxxxxxxxxxxxxxxx.$
+student@ubuntu:~/student/repeatalpha$ ./repeatalpha "abacadaba 42!" | cat -e
+abbacccaddddabba 42!$
+student@ubuntu:~/student/repeatalpha$ ./repeatalpha | cat -e
+$
+student@ubuntu:~/student/repeatalpha$ ./repeatalpha "" | cat -e
+$
+student@ubuntu:~/student/repeatalpha$ 
+```

subjects/reversebits.md

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+# reversebits
+## Instructions
+
+Write a function that takes a byte, reverses it, bit by bit (like the
+example) and returns the result.
+
+Your function must be declared as follows:
+
+func ReverseBits(octet byte) byte {
+     ...
+}
+
+Example:
+
+  1 byte
+_____________
+ 00100110
+    ||
+    \/
+ 01100100

subjects/swapbits.md

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+# swapbits
+## Instructions
+
+Write a function that takes a byte, swaps its halves (like the example) and
+returns the result.
+
+Your function must be declared as follows:
+
+func SwapBits(octet byte) byte {
+     ...
+}
+
+Example:
+
+  1 byte
+_____________
+ 0100 | 0001
+     \ /
+     / \
+ 0001 | 0100

subjects/union.md

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+# union
+## Instructions
+
+Write a program that takes two strings and displays, without doubles, the
+characters that appear in either one of the strings.
+
+The display will be in the order characters appear in the command line, and
+will be followed by a \n.
+
+If the number of arguments is not 2, the program displays \n.
+
+Example :
+
+```console
+student@ubuntu:~/student/union$ go build
+student@ubuntu:~/student/union$ ./union zpadinton "paqefwtdjetyiytjneytjoeyjnejeyj" | cat -e
+zpadintoqefwjy$
+student@ubuntu:~/student/union$ ./union ddf6vewg64f gtwthgdwthdwfteewhrtag6h4ffdhsd | cat -e
+df6vewg4thras$
+student@ubuntu:~/student/union$ ./union "rien" "cette phrase ne cache rien" | cat -e
+rienct phas$
+student@ubuntu:~/student/union$ ./union | cat -e
+$
+student@ubuntu:~/student/union$ ./union "rien" | cat -e
+$
+student@ubuntu:~/student/union$
+```