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- JavaScript calculator
Calculator </ Title></p>
<p></ hEAD></p>
<p><body bgcolor = "# ffffff" οnlοad = "fkeypad.readout.focus (); fkeypad.readOut.select ();>></p>
<p><Form name = "Keypad" Action = ">></p>
<p><Table align = "center"></p>
<p><B></p>
<p><Table align = "center" border = 2 width = 50 height = 60 Cellpadding = 1 cellspacing = 5></p>
<p><Tr></p>
<p><Td colspan = 3 align = middle> <input name = "readout" type = "οnkeypress =" checkout () "size = 24 value =" 0 "width = 100%> </ td></p>
<p><TD> </ td></p>
<p><TD> <Input Name = "BTNCLEAR" TYPE = "Button" Value = "C" οnclick = "clear ()"> </ td></p>
<p><TD> <input name = "btnclearentry" type = "button" value = "ce" οnclick = "clearentry ()> </ td></p>
<p></ TR></p>
<p><Tr></p>
<p><TD> <Input Name = "btnseven" type = "button" value = "7" οnclick = "NumpRessed (7)> </ td></p>
<p><TD> <input name = "btneight" type = "button" value = "8" οnclick = "NUMPRESSED (8)"> </ td></p>
<p><TD> <input name = "btnnine" type = "button" value = "9" οnclick = "NumpRessed (9)"> </ td></p>
<p><TD> </ td></p>
<p><TD> <input name = "btnneg" type = "button" value = " /-" οnclick = "NEG ()"> </ td></p>
<p><TD> <input name = "btnpercent" type = "button" value = "%" οnclick = "percent ()> </ td> </ tr></p>
<p><Tr></p>
<p><TD> <input name = "btnfour" type = "button" value = "4" οnclick = "NUMPRESSED (4)> </ td></p>
<p><TD> <input name = "btnfive" type = "button" value = "5" οnclick = "NUMPRESSED (5)"> </ td></p>
<p><TD> <input name = "btnsix" type = "button" value = "6" οnclick = "NUMPRESSED (6)"> </ td></p>
<p><TD> </ td></p>
<p><TD align = middle> <input name = "btnplus" type = "button" value = " " οnclick = "Operation (' ')> </ td></p>
<p><TD align = middle> <input name = "btnminus" type = "button" value = "-" οnclick = "Operation ('-')> </ td></p>
<p></ TR></p>
<p><Tr></p>
<p><TD> <input name = "btnone" type = "button" value = "1" οnclick = "NumpRessed (1)> </ td></p>
<p><TD> <input name = "btntwo" type = "button" value = "2" οnclick = "NUMPRESSED (2)> </ td></p>
<p><TD> <input name = "btnthree" type = "button" value = "3" οnclick = "NUMPRESSED (3)"> </ td></p>
<p><TD> </ td></p>
<p><TD align = middle> <input name = "btnmultiply" type = "οnclick =" * "οnclick =" Operation ('*') "> </ td></p>
<p><TD align = middle> <input name = "BTNDIVIDE" type = "button" value = "/" οnclick = "Operation ('/')"> </ td> </ tr></p>
<p><Tr></p>
<p><TD> <input name = "btnzero" type = "button" value = "0" οnclick = "NumpRessed (0)> </ td></p>
<p><TD> <Input Name = "BTNDECIMAL" TYPE = "Button" Value = "." Οnclick = "decimal ()> </ td></p>
<p><TD COLSPAN = 2> </ td></p>
<p><TD> <input name = "btnequals" type = "" value = "=" οnclick = "Operation ('=')> </ td></p>
<p><TD> <Input Name = "BTNRETURN" TYPE = "button" value = "Returns" οnclick = "goreturn ()> </ td></p>
<p></ TR></p>
<p></ TABLE></p>
<p></ TABLE></p>
<p></ B></p>
<p></ Form></p>
<p></ Center></p>
<p><font face = "Verdana, Arial, Helvetica" Size = 2></p>
<p><Script language = "javascript"></p>
<p><! - begin</p>
<p>VAR fkeypad = document.forms ['keypad'];</p>
<p>VAR Accum = "0";</p>
<p>Var flagnewnum = false;</p>
<p>Var pendingop = "";</p>
<p>/ / =========================================================================================================================================================================================== ========================================= // [Description] Floating point number precision calculation // [parameter] str1 - the first one Number // str2 - second number // type - operator // Precision - Digital accuracy // [Call mode] longcount (str1, str2, type, precision; // [Return value] calculation results // = ============================================================================================================================================================================================================= ============================ function longcount (str1, str2, type) {var COMMA1 = 0; if (str1.indexof ")! = - 1) {str1 = str1.replace; comma1 = str1.length - str1.indexof (". ") - 1;} var COMMA2 = 0; IF Str2.indexof (".")! = - 1) {str2 = str2.replace (/ 0 * $ /, "); comMA2 = str2.length - str2.indexof (". ") - 1;} str1 = Str1.replace (//./, ""); str2 = str2.replace (//./, ""); var value, comma; if (Type! = "*") {if (COMMA1> COMMA2) { For (var i = 0; i <COMMA1-COMMA2; I ) STR2 = "0"; COMMA = (TYPE == "/")? 0: Comma1;</p>
<p>} else {for (VAR i = 0; I <COMMA2-COMMA1; I ) str1 = "0"; COMMA = (Type == "/")? 0: Comma2;}} else {COMMA = COMMA1 COMMA2; } F (type == " ") {value = parseint (str1, 10) PARSEINT (STR2, 10);} else if (type == "-") {value = parseint (str1, 10) - PARSEINT STR2, 10);} else if (type == "*") {value = parseint (str1, 10) * PARSEINT (STR2, 10);} else if (type == "/") {value = parseint (str1 , 10) / PARSEINT (STR2, 10);} value = string (value); if (COMMA> 0) value = value.substring (0, value.length-comma) "." Value.substring (Value. Length-comma, value.length; if (value.indexof (".")! = - 1) value = value.Replace (/ 0 * $ /, ""); return value;} function NumpRessed (NUM) { IF (FLAGNEWNUM) {fkeypad.readout.value = Num; flagnewnum = false;} else {if (fkeypad.readout.value == "0") fkeypad.readOut.Value = Num; else fkeypad.readOut.valu E = Num;}} function operation (op) {var readout = fkeypad.readout.value; if (Flagnewnum && pendingop! = "="); else {flagnewnum = true; if (' ' == pendingop || '/' == pendingop || '*' == pendingop) accum = longcount (account, readout, pendingop); else accum = readout; fkeypad.readOut.Value = Accum; pendingop = op FKeyPad.ReadOut.focus ();</p></div><div class="text-center mt-3 text-grey">
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