在Button1的ONCLICK中
VAR
DD:STRING;
BEGIN
DD:=EDIT3.TEXT;
CASE DD[1] OF
'+':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) + STRTOINT(EDIT2.TEXT));
'-':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) - STRTOINT(EDIT2.TEXT));
'*':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) * STRTOINT(EDIT2.TEXT));
'/':LABEL1.CAPTION:=FLOATTOSTR(STRTOINT(EDIT1.TEXT) / STRTOINT(EDIT2.TEXT));
'D':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) DIV STRTOINT(EDIT2.TEXT));
'M':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) MOD STRTOINT(EDIT2.TEXT));
ELSE
LABEL1.CAPTION:='不能执行这种运算';
END;
end;
VAR
DD:STRING;
BEGIN
DD:=EDIT3.TEXT;
CASE DD[1] OF
'+':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) + STRTOINT(EDIT2.TEXT));
'-':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) - STRTOINT(EDIT2.TEXT));
'*':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) * STRTOINT(EDIT2.TEXT));
'/':LABEL1.CAPTION:=FLOATTOSTR(STRTOINT(EDIT1.TEXT) / STRTOINT(EDIT2.TEXT));
'D':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) DIV STRTOINT(EDIT2.TEXT));
'M':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) MOD STRTOINT(EDIT2.TEXT));
ELSE
LABEL1.CAPTION:='不能执行这种运算';
END;
end;
type
operator=('+','-','*','\','d','m');
OperatorSet=set of operator;
var OperSet:OperatorSet; TEdit3.chenge()
begin
if not(edit3.text in Operset) then
begin
lable3.caption:='不能执行这种运算';
END;
end;
end;
Var
cIn:char;
Begin
cIn:=copy(EDIT3.TEXT,1,1);
Case cIn of
'+':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) + STRTOINT(EDIT2.TEXT));
'-':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) - STRTOINT(EDIT2.TEXT));
'*':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) * STRTOINT(EDIT2.TEXT));
else
if strToint(Edit1.Text) <> 0 then
Case cIn of
'/':LABEL1.CAPTION:=FLOATTOSTR(STRTOINT(EDIT1.TEXT) / STRTOINT(EDIT2.TEXT));
'D':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) DIV STRTOINT(EDIT2.TEXT));
'M':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) MOD STRTOINT(EDIT2.TEXT));
end
LABEL1.CAPTION:='不能执行这种运算';
end;
end;
end;
cIn:char;
Begin
cIn:=EDIT3.TEXT[1];
Case cIn of
'+':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) + STRTOINT(EDIT2.TEXT));
'-':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) - STRTOINT(EDIT2.TEXT));
'*':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) * STRTOINT(EDIT2.TEXT));
else
if strToint(Edit2.Text) <> 0 then
begin
Case cIn of
'+','-','*': ;
'/':LABEL1.CAPTION:=FLOATTOSTR(STRTOINT(EDIT1.TEXT) / STRTOINT(EDIT2.TEXT));
'D':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) DIV STRTOINT(EDIT2.TEXT));
'M':LABEL1.CAPTION:=INTTOSTR(STRTOINT(EDIT1.TEXT) MOD STRTOINT(EDIT2.TEXT));
else
LABEL1.CAPTION:='不能执行这种运算';
end;
end
else LABEL1.CAPTION:='不能除零!';
end;
end;
cIn:char;
Begin
cIn:=EDIT3.TEXT[1];
if (strToint(Edit2.Text) = 0) and (cIn<>'+') and (cIn<>'-') and (cIn<>'*')
then cIn := 'x';
Case cIn of
'+':Label1.Caption:=IntToStr(StrToInt(EDIT1.TEXT) + StrToInt(EDIT2.TEXT));
'-':Label1.Caption:=IntToStr(StrToInt(EDIT1.TEXT) - StrToInt(EDIT2.TEXT));
'*':Label1.Caption:=IntToStr(StrToInt(EDIT1.TEXT) * StrToInt(EDIT2.TEXT));
'/':Label1.Caption:=FloatToStr(StrToInt(EDIT1.TEXT) / StrToInt(EDIT2.TEXT));
'D':Label1.Caption:=IntToStr(StrToInt(EDIT1.TEXT) DIV StrToInt(EDIT2.TEXT));
'M':Label1.Caption:=IntToStr(StrToInt(EDIT1.TEXT) MOD StrToInt(EDIT2.TEXT));
'x':Label1.Caption:='不能除零!';
else
Label1.Caption:='不能执行这种运算';
end;
end;
'/':Lable1.caption:=FloatToStr(StrToFloat(Edit1.Text) / StrToFloat(
Edit2.Text));