如何解决通用Lisp变量addFraction未绑定
为什么说变量addFraction
是未绑定的?
(defun addFraction (N1 D1 N2 D2)
(format t "~d ~d"
(+ (+ (lcm D1 D2) N1) (+ (lcm D1 D2) N2))
(lcm D1 D2)))
当我运行代码时,它会说:
#<THREAD "main thread" RUNNING {10010B0523}>:
The variable ADDFRACTION is unbound.
Type HELP for debugger help,or (SB-EXT:EXIT) to exit from SBCL.
restarts (invokable by number or by possibly-abbreviated name):
0: [CONTINUE ] Retry using ADDFRACTION.
1: [USE-VALUE ] Use specified value.
2: [STORE-VALUE] Set specified value and use it.
3: [ABORT ] Exit debugger,returning to top level.
(SB-INT:SIMPLE-EVAL-IN-LEXENV ADDFRACTION #<NULL-LEXENV>)
0]
解决方法
我的坏人!
当我调用输入的函数时
(addFunction 1 2 1 4)
代替
import SwiftUI
extension View {
func showIf(condition: Bool) -> AnyView {
if condition {
return AnyView(self)
}
else {
return AnyView(EmptyView())
}
}
}
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。