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2016 Update

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Tina Müller 2016-12-05 22:15:40 +01:00
parent 948b86eafa
commit dcf5d15da3
7965 changed files with 139854 additions and 31002 deletions
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22
Task/Modular-inverse/REXX/modular-inverse.rexx
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@ -1,13 +1,15 @@
/*REXX program calculates the modular inverse of an integer X modulo Y. */
parse arg x y . /*obtain two integers from the C.L. */
say 'modular inverse of ' x " by " y ' ───► ' modInv(x,y)
exit /*stick a fork in it, we're all done. */
/*────────────────────────────────────────────────────────────────────────────*/
modInv: parse arg a,b 1 ob; ox=0
/*REXX program calculates and displays the modular inverse of an integer X modulo Y.*/
parse arg x y . /*obtain two integers from the C.L. */
if x=='' | x=="," then x= 42 /*Not specified? Then use the default.*/
if y=='' | y=="," then y= 2017 /* " " " " " " */
say 'modular inverse of ' x " by " y ' ───► ' modInv(x,y)
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
modInv: parse arg a,b 1 ob; z=0 /*B & OB are obtained from the 2nd arg.*/
$=1
if b \= 1 then do while a>1
parse value a/b a//b b ox with q b a t
ox=$-q*ox; $=trunc(t)
end /*while a>1*/
if b\=1 then do while a>1
parse value a/b a//b b z with q b a t
z=$ - q*z; $=trunc(t)
end /*while*/
if $<0 then $=$+ob
return $