标签:符号 窗口 添加 图片 截取字符串 false 不能 布局 计算过程
1.定义实例变量(由于运算符有挂在窗口,所以将变量定义为全局变量,以便菜单项也可以使用)
decimal num //存放操作数,decimal带符号数据,18位有效数字
character operator //存放操作符,character单个字符
int flag //标志位,判断一次计算是否成功
string sle //记录运算过程,连续运算时将输入的过程显示在文本框1中
2.编写代码,实现当点击数字或小数点按钮时,其值能显示到文本框中
if flag=0 then //第一次输入,将文本框显示的初始值赋空
sle_1.text = ""
flag = 1
end if
sle_1.text = sle_1.text+this.text //若不是第一次输入,就将该数字按键的值追加在文本框中
sle = sle+this.text
3.实现运算符(+ 、-、*、/),计算功能
string()可将任意的数据类型转换成字符串类型
dec()把获取的字符型数据转换成数字
mid(string,start,length) 截取字符串的子串
match(str,textpattern) 确定字符串中是否包含指定模式的字符
//加减运算,不会出现+++的情况
choose case operator
case ‘+‘
sle_2.text = string(dec(sle_1.text)+num)
sle_1.text = sle_2.text
//sle_1.text = string(num)+operator+sle_1.text
case ‘-‘
sle_2.text = string(num - dec(sle_1.text))
sle_1.text = sle_2.text
case ‘*‘
sle_2.text = string(num * dec(sle_1.text))
sle_1.text = sle_2.text
case ‘/‘
sle_2.text = string(num/dec(sle_1.text))
sle_1.text = sle_2.text
end choose
num = dec(sle_1.text) //保留中间结果
operator = this.text //保留本次运算,当前输入的运算符
flag = 0 //准备输入下一个操作数
//sle_1.text = sle_1.text + this.text
sle = sle+this.text
if mid(sle,len(sle)-1,1)= this.text then
sle = mid(sle,0,len(sle)-1)
end if
sle_1.text = sle
//乘除运算,还存在问题:连按*或/按钮时,文本跨会显示****或/////
choose case operator
case ‘+‘
sle_2.text = string(dec(sle_1.text)+num)
sle_1.text = sle_2.text
case ‘-‘
sle_2.text = string(num - dec(sle_1.text))
sle_1.text = sle_2.text
case ‘*‘
if match(sle_1.text,"^[0-9]$") = true then //出现***后,匹配传过来以便下次运算的sle_1.text的内容是否由数字组成
sle_2.text = string(num * dec(sle_1.text))
elseif match(sle_1.text,"^[0-9]$") = false then
//将sle_1.text的值改为1,进行运算。
sle_2.text = string(num)
end if
sle_1.text = sle_2.text
case ‘/‘
if match(sle_1.text,"^[0-9]$") = true then //出现////后,匹配传过来以便下次运算的sle_1.text的内容是否由数字组成
sle_2.text = string(num/dec(sle_1.text))
elseif match(sle_1.text,"^[0-9]$") = false then
//将sle_1.text的值改为1,进行运算。这样连按//,不会出现逻辑错误
sle_2.text = string(num)
end if
sle_1.text = sle_2.text
end choose
num = dec(sle_1.text) //保留中间结果
operator = this.text //保留本次运算,当前输入的运算符
flag = 0 //准备输入下一个操作数
sle = sle+this.text
if mid(sle,len(sle)-1)= this.text then
sle = mid(sle,0,len(sle)-2)
end if
sle_1.text = sle
4.实现点击=按钮,显示运算的最终结果
choose case operator
case ‘+‘
sle_2.text = string(dec(sle_1.text)+num)
case ‘-‘
sle_2.text = string(num - dec(sle_1.text))
case ‘*‘
sle_2.text = string(dec(sle_1.text) * num)
case ‘/‘
if sle_1.text ="0" then
sle_2.text = "不能除以0"
else
sle_2.text = string(num/dec(sle_1.text))
end if
//sle_1.text = string(num)+operator+sle_1.text
end choose
num = dec(sle_1.text) //保留此次计算的数据,即输入的后一个数字,即A+B中的B
operator = " " //保留本次运算,当前输入的运算符
flag = 0 //准备下一个操作数的输入
sle = sle+operator
sle_1.text = sle
5.实现清空和退格删除功能
sle_1.text = " "
sle_2.text = " "
flag = 0
operator = ‘‘
num = 0 //清空,需将两个文本框的内容赋空即可
if len(mid(sle,0,len(sle)-1)) = 0 then //判断显示的文本框是否为空,
sle = ""
else
sle = mid(sle,0,len(sle)-1) //退格,删除一个数字或是运算符
end if
//messagebox("sle",sle)
sle_1.text = sle
6.添加菜单(运算符),可通过菜单项的运算符来实现计算器的运算功能
//加、减运算符
choose case operator
case ‘+‘
w_operator.sle_2.text = string(dec(w_operator.sle_1.text)+num)
w_operator.sle_1.text = w_operator.sle_2.text
case ‘-‘
w_operator.sle_2.text = string(num - dec(w_operator.sle_1.text))
w_operator.sle_1.text = w_operator.sle_2.text
case ‘*‘
w_operator.sle_2.text = string(num*dec(w_operator.sle_1.text))
w_operator.sle_1.text = w_operator.sle_2.text
case ‘/‘
w_operator.sle_2.text = string(num/dec(w_operator.sle_1.text))
w_operator.sle_1.text = w_operator.sle_2.text
end choose
num = dec(w_operator.sle_1.text) //保留中间结果 num=A 或是 A+B的结果
operator = "+" //保留本次运算,当前输入的运算符
flag = 0 //准备下一个操作数的输入
sle = sle+ "+" //若出现++,则截断最后多的+后再往下计算
if mid(sle,len(sle)-1,1)= "+" then
sle = mid(sle,0,len(sle)-1)
end if
w_operator.sle_1.text = sle
//乘、除运算符
choose case operator
case ‘+‘
w_operator.sle_2.text = string(dec(w_operator.sle_1.text)+num)
w_operator.sle_1.text = w_operator.sle_2.text
case ‘-‘
w_operator.sle_2.text = string(num - dec(w_operator.sle_1.text))
w_operator.sle_1.text = w_operator.sle_2.text
case ‘*‘
if match(w_operator.sle_1.text,"^[0-9]$") = true then //出现**后,匹配传过来以便下次运算的sle_1.text的内容是否由数字组成
w_operator.sle_2.text = string(num*dec(w_operator.sle_1.text))
elseif match(w_operator.sle_1.text,"^[0-9]$") = false then
// ** 后 sle_1.text=A*B*C即文本框的内容, 不能转换成数字类型进行运算计算
//将sle_1.text的值改为1,进行运算。这样连按**,不会出现计算错误
w_operator.sle_2.text = string(num)
end if
w_operator.sle_1.text = w_operator.sle_2.text
case ‘/‘
w_operator.sle_2.text = string(num/dec(w_operator.sle_1.text))
w_operator.sle_1.text = w_operator.sle_2.text
end choose
num = dec(w_operator.sle_1.text) //保留输入的前一个数
operator = "*" //保留本次运算,当前输入的运算符
flag = 0 //准备下一个操作数的输入
sle = sle+"*"
if mid(sle,len(sle)-1)= "*" then
sle = mid(sle,0,len(sle)-2)
//sle_1.text = "1"
else
w_operator.sle_1.text = sle
end if
标签:符号 窗口 添加 图片 截取字符串 false 不能 布局 计算过程
原文地址:https://www.cnblogs.com/mydiray/p/14015675.html