Initial data commit

Task/Arithmetic-Complex/Icon/arithmetic-complex-2.icon

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+link complex                            # for complex number support
+
+procedure SetupComplex()                #: used to setup safe complex
+COMPLEX()				#  replace complex record constructor	
+SetupComplex := 1                       #  never call here again
+return
+end
+
+procedure COMPLEX(rpart,ipart)          #: new safe record constructor and coercion
+initial complex :=: COMPLEX             # get in front of record constructor
+return if /ipart & (type(rpart) == "complex")
+   then rpart                           #                  already complex
+   else COMPLEX( real(\rpart | 0.0), real(\ipart|0) )    # create a new complex number
+end
+
+procedure cpxneg(z)                     #: negate z
+   z := complex(z)                      # coerce
+   return complex( -z.rpart, -z.ipart)
+end
+
+procedure cpxinv(z)                     #: inverse of z
+   local denom
+   z := complex(z)                      # coerce
+
+   denom := z.rpart ^ 2 + z.ipart ^ 2
+   return complex(z.rpart / denom, z.ipart / denom)
+end