Hi!
I have a problem. With that code:
; =======================================
; ex 1.17 multiply
(defn ex1_17 []
(defn double [x] (+ x x))
(defn halve [x] (/ x 2))
(defn * [a b]
(cond
(= b 0) 0
(even? b) (* (double a) (halve b))
:else (+ a (* a (- b 1)))))
(println (* 5 5))
)
(ex1_17 )
I gave that exception:
Exception in thread "main" java.lang.NullPointerException, compiling:
(D:\workprivate\ll\1\src\first.clj:3)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:6462)
at clojure.lang.Compiler.analyze(Compiler.java:6262)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:6443)
at clojure.lang.Compiler.analyze(Compiler.java:6262)
at clojure.lang.Compiler.access$100(Compiler.java:37)
at clojure.lang.Compiler$DefExpr$Parser.parse(Compiler.java:518)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:6455)
at clojure.lang.Compiler.analyze(Compiler.java:6262)
at clojure.lang.Compiler.analyze(Compiler.java:6223)
at clojure.lang.Compiler.eval(Compiler.java:6515)
at clojure.lang.Compiler.load(Compiler.java:6952)
at clojure.lang.Compiler.loadFile(Compiler.java:6912)
at clojure.main$load_script.invoke(main.clj:283)
at clojure.main$script_opt.invoke(main.clj:343)
at clojure.main$main.doInvoke(main.clj:427)
at clojure.lang.RestFn.invoke(RestFn.java:408)
at clojure.lang.Var.invoke(Var.java:415)
at clojure.lang.AFn.applyToHelper(AFn.java:161)
at clojure.lang.Var.applyTo(Var.java:532)
at clojure.main.main(main.java:37)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:
120)
Caused by: java.lang.NullPointerException
at clojure.lang.Compiler$ObjExpr.emitVar(Compiler.java:4774)
at clojure.lang.Compiler$DefExpr.emit(Compiler.java:418)
at clojure.lang.Compiler$BodyExpr.emit(Compiler.java:5659)
at clojure.lang.Compiler$FnMethod.doEmit(Compiler.java:5215)
at clojure.lang.Compiler$FnMethod.emit(Compiler.java:5069)
at clojure.lang.Compiler$FnExpr.emitMethods(Compiler.java:3600)
at clojure.lang.Compiler$ObjExpr.compile(Compiler.java:4233)
at clojure.lang.Compiler$FnExpr.parse(Compiler.java:3732)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:6453)
... 24 more
Could you tell me where I wrong?
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