PHP implements simple calculator program code

Php calculator

The code is as follows:

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<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>

Js calculator

The code is as follows:

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<Html> <Head> <Title> calculator </title> <Script> <! -- Willclear = false // This variable is used as the status marker of whether to clear the input box for the next input. Function backspace () {// return Calc. Input. value = Calc. Input. value. substring (0, Calc. Input. value. length-1) Calc. Input. title = Calc. Input. value. substring (0, Calc. Input. title. length-1) } // Take the string whose length is equal to or less than one of the original length to return the lattice. Function addoperator () {// add an operator If (willclear) {// if you need to clear the input box before this input Willclear = false // clear the flag first to avoid being mistakenly cleared again next time Clearinput () // clear the input content } Calc. Input. value + = event. srcElement. innerText // add the newly entered operator to the display. Calc. Input. title + = event. srcElement. name // add the newly entered operator to the expression area for calculation. } Function clearinput () {// clear input Calc. Input. value = ''// clear the display area Calc. Input. title = ''// clear expression } Function result () {// used for calculation results Calc. Input. value = eval (Calc. Input. title) // executes the expression in the expression area and returns the result to the display area. Willclear = true // set the next button to clear the calculation result first. } // --> </Script> <Style> Button {width: 40; border: 1 solid #808080; background-color: # FFFFFF} </Style> </Head> <Body> <Form name = "Calc"> <Table border = 4 bordercolorlight = "#808080" bordercolor = "#808080" width = "250" height = "38"> <TR> <TD width = "291" height = "39" bgcolor = "# C0C0C0"> & Nbsp; <Input type = "text" NAME = "Input" readonly Size = "21" style = "background-color: # F5F5F5; font-family: Arial; border: 1 solid #000000 "> & nbsp <Button NAME = "back" OnClick = "backspace ()"> & larr; </button> </TD> </TR> <TD width = "291" height = "38"> <Table border = "0" width = "100%" height = "105" cellpadding = "0"> <Tr> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "1" OnClick = "addoperator ()"> 1 </BUTTON> </Td> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "2" OnClick = "addoperator ()"> 2 </BUTTON> </Td> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "3" OnClick = "addoperator ()"> 3 </BUTTON> </Td> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "+" OnClick = "addoperator ()"> + </BUTTON> </Td> </Tr> <Tr> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "4" OnClick = "addoperator ()"> 4 </BUTTON> </Td> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "5" OnClick = "addoperator ()"> 5 </BUTTON> </Td> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "6" OnClick = "addoperator ()"> 6 </BUTTON> </Td> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "-" OnClick = "addoperator ()">-</BUTTON> </Td> </Tr> <Tr> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "7" OnClick = "addoperator ()"> 7 </BUTTON> </Td> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "8" OnClick = "addoperator ()"> 8 </BUTTON> </Td> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "9" OnClick = "addoperator ()"> 9 </BUTTON> </Td> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "*" OnClick = "addoperator ()"> × </BUTTON> </Td> </Tr> <Tr> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "clear" OnClick = "clearinput ()"> C </BUTTON> </Td> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "0" OnClick = "addoperator ()"> 0 </BUTTON> </Td> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "=" OnClick = "result ()" >=</BUTTON> </Td> <Td width = "25%" height = "31" align = "center" bgcolor = "# C0C0C0"> <Button name = "/" OnClick = "addoperator ()"> Events </BUTTON> </Td> </Tr> </Table> </TD> </TR> </TABLE> </FORM> </Body> </Html>