重复直到lua循环

Posted 2021-05-03

我的lua代码出错了什么？

local which

print("Type f to convert fahrenheit to celsius and c to convert celsius to fahrenheit")
which = io.read()
repeat
    if which=="f" then
        local c
        local f
        print("input your fahrenheit temperature")
        f = tonumber(io.read())
        c = (f-32)/1.8
        print(c)
    end

    elseif which=="c" then
        local ce
        local fa
        print("input your celsius temperature")
        c = tonumber(io.read())
        f = (c*1.8)+32
    end

    else do
    print("Type f to convert fahrenhiet to celsius and c to convert celsius to fahrenheit")
until which=="f" or which=="c"

答案

你先关闭你的if区块。删除用于关闭end和if的elseif语句，并在else之后将其关闭。

local which

print("Type f to convert fahrenheit to celsius and c to convert celsius to fahrenheit")
which = io.read()
repeat
    if which=="f" then
        local c
        local f
        print("input your fahrenheit temperature")
        f = tonumber(io.read())
        c = (f-32)/1.8
        print(c)

    elseif which=="c" then
        local ce
        local fa
        print("input your celsius temperature")
        c = tonumber(io.read())
        f = (c*1.8)+32

    else
        print("Type f to convert fahrenhiet to celsius and c to convert celsius to fahrenheit")
    end
until which=="f" or which=="c"

---

P.S。：这可能会导致你无限循环。您需要在重复内部的每次迭代后更新which，直到。

另一答案

在end之前应该没有elseif。之前也应该没有end，而且在do之后没有else。在end部分之后和else之前应该有一个until：

repeat
  if ... then
    ...
  elseif ... then
    ...
  else
    ...
  end
until ...

下次如果你至少发布了你的问题（错误信息，意外输出等）会很有帮助。

另一答案

local which
repeat
    print("Type f to convert fahrenheit to celsius and c to convert celsius to fahrenheit")
    which = io.read()
    if which=="f" then
        local c
        local f
        print("input your fahrenheit temperature")
        f = tonumber(io.read())
        c = (f-32)/1.8
        print(c)

    elseif which=="c" then
        local c
        local f
        print("input your celsius temperature")
        c = tonumber(io.read())
        f = (c*1.8)+32
        print(f)
    end
    print("do you want to play again? y/n?")
    antwort = io.read()


until antwort ~= "y"