<Html>
<Head>
<Title> PHP implements a simple calculator </title>
<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312">
</Head>
<? Php
$ Num1 = true;
$ Num2 = true;
$ Numa = true;
$ Numb = true;
$ Message = "";
// Single Branch
If (isset ($ _ GET ["sub"]) {
If ($ _ GET ["num1"] = ""){
$ Num1 = false;
$ Message. = "The first number cannot be blank "; }
If (! Is_numeric ($ _ GET ["num1"]) {
$ Numa = false;
$ Message. = "The first number is not a number ";
} If ($ _ GET ["num2"] = ""){
$ Num2 = false;
$ Message. = "The second number cannot be blank "; }
If (! Is_numeric ($ _ GET ["num2"]) {
$ Numb = false;
$ Message. = "The second number is not a number ";
} If ($ num1 & $ num2 & $ numa & $ numb ){
$ Sum = 0;
// Multiple branch switches
Switch ($ _ GET ["ysf"]) {
Case "+ ":
$ Sum = $ _ GET ["num1"] + $ _ GET ["num2"];
Break;
Case "-":
$ Sum = $ _ GET ["num1"]-$ _ GET ["num2"];
Break;
Case "x ":
$ Sum = $ _ GET ["num1"] * $ _ GET ["num2"];
Break;
Case "/":
$ Sum = $ _ GET ["num1"]/$ _ GET ["num2"];
Break;
Case "% ":
$ Sum = $ _ GET ["num1"] % $ _ GET ["num2"];
Break;
}
}
}
?>
<Br/> <B> Notice </B>: Undefined index: num1 in <B>
D: \ php \ PHPnow1.5.5 \ Package \ vhosts \ 127.0.0.1 \ ceshi \ jsq. php </B>
On line <B> 64 </B> <br/>
<Body>
<Table align = "center" border = "1" width = "500">
<Caption> <Form action = "jsq. php">
<Tr>
<Td>
<Input type = "text" size = "5" name = "num1" value = "<? Php echo $ _ GET ["num1"]?> ">
</Td>
<Td>
<Select name = "ysf">
<Option value = "+" <? Php if ($ _ GET ["ysf"] = "+") echo "selected"?> + </Option>
<Option value = "-" <? Php if ($ _ GET ["ysf"] = "-") echo "selected"?> -</Option>
<Option value = "x" <? Php echo $ _ GET ["ysf"] = "x "? "Selected": ""?> X </option>
<Option value = "/" <? Php echo $ _ GET ["ysf"] = "/"? "Selected": ""?> /</Option>
<Option value = "%" <? Php echo $ _ GET ["ysf"] = "% "? "Selected": ""?> % </Option>
</Select>
</Td>
<Td>
<Input type = "text" size = "5" name = "num2" value = "<? Php echo $ _ GET ["num2"]?> ">
</Td>
<Td>
<Input type = "submit" name = "sub" value = "computing">
</Td>
</Tr> <? Php
If (isset ($ _ GET ["sub"]) { Echo '<tr> <td colspan = "5"> ';
If ($ num1 & $ num1 & $ numa & $ numb ){
Echo "result :". $ _ GET ["num1"]. "". $ _ GET ["ysf"]. "". $ _ GET ["num2"]. "= ". $ sum;
} Else {
Echo $ message;
}
Echo '</td> </tr> ';
}
?>
</Form>
</Table> </Body>
</Html> |
