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JSP实现简单的计算器
JSP实现简单的计算器
xiaoxiao
2023-03-24
4
<
body
>
<%double num1=
0
,num2=
0
,add=
0
;
int
flag=
0
;
String
tNum1=
request
.getParameter(
"in1"
);
String
tNum2=
request
.getParameter(
"in2"
);
String
tFlag=
request
.getParameter(
"flag"
);
if
(tFlag!=
null
&&!tFlag.equals(
""
)){ flag=Integer.parseInt(tFlag); }
if
(tNum1!=
null
&& tNum2!=
null
&& !tNum1.equals(
""
) && !tNum2.equals(
""
)){ num1=Double.parseDouble(tNum1); num2=Double.parseDouble(tNum2); switch(flag){
case
0
:add=num1+num2;break;
case
1
:add=num1-num2;break;
case
2
:add=num1*num2;break;
case
3
:
if
(num2==
0
) add=
0
;
else
add=num1/num2; break; } } %>
<
form
action
=
""
method
=
"post"
>
<
input
type
=
"text"
name
=
"in1"
value
=
"<%=num1 %>"
/>
<%switch(flag){
case
0
: %>
<
select
name
=
"flag"
>
<
option
value
=
"0"
selected
>
+
</
option
>
<
option
value
=
"1"
>
-
</
option
>
<
option
value
=
"2"
>
*
</
option
>
<
option
value
=
"3"
>
/
</
option
>
</
select
>
<% break;
case
1
: %>
<
select
name
=
"flag"
>
<
option
value
=
"0"
>
+
</
option
>
<
option
value
=
"1"
selected
>
-
</
option
>
<
option
value
=
"2"
>
*
</
option
>
<
option
value
=
"3"
>
/
</
option
>
</
select
>
<% break;
case
2
: %>
<
select
name
=
"flag"
>
<
option
value
=
"0"
>
+
</
option
>
<
option
value
=
"1"
>
-
</
option
>
<
option
value
=
"2"
selected
>
*
</
option
>
<
option
value
=
"3"
>
/
</
option
>
</
select
>
<% break;
case
3
: %>
<
select
name
=
"flag"
>
<
option
value
=
"0"
>
+
</
option
>
<
option
value
=
"1"
>
-
</
option
>
<
option
value
=
"2"
>
*
</
option
>
<
option
value
=
"3"
selected
>
/
</
option
>
</
select
>
<%}%>
<
input
type
=
"text"
name
=
"in2"
value
=
"<%=num2 %>"
/>
<
input
type
=
"submit"
name
=
"dengyu"
value
=
"="
/>
<
input
type
=
"text"
value
=
"<%=add %>"
/>
</
form
>
</
body
>
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