Scientific Calculator Widget

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<script LANGUAGE="JavaScript"> <!-- Begin function addChar(input, character) { if(input.value == null || input.value == "0") input.value = character else input.value += character } function cos(form) { form.display.value = Math.cos(form.display.value);} function sin(form) { form.display.value = Math.sin(form.display.value);} function tan(form) { form.display.value = Math.tan(form.display.value);} function sqrt(form) { form.display.value = Math.sqrt(form.display.value);} function ln(form) { form.display.value = Math.log(form.display.value);} function exp(form) { form.display.value = Math.exp(form.display.value);} function sqrt(form) { form.display.value = Math.sqrt(form.display.value);} function deleteChar(input) { input.value = input.value.substring(0, input.value.length - 1) } function changeSign(input) { if(input.value.substring(0, 1) == "-") input.value = input.value.substring(1, input.value.length) else input.value = "-" + input.value } function compute(form) { form.display.value = eval(form.display.value)} function square(form) { form.display.value = eval(form.display.value) * eval(form.display.value)} function checkNum(str) { for (var i = 0; i < str.length; i++) { var ch = str.substring(i, i+1) if (ch < "0" || ch > "9") { if (ch != "/" && ch != "*" && ch != "+" && ch != "-" && ch != "." && ch != "(" && ch!= ")") { alert("invalid entry!") return false } } } return true } // End --> </SCRIPT><center> <table width=362 border=4 height=246 bordercolor=#000000 bgcolor=#FFFFFF> <tr><td><form> <div align=center> <input name=display value=0 size=25> <font size=1 face="Verdana, Arial, Helvetica, sans-serif"><a href=http://wigetbygary.blogspot.com/2013/11/scientific-calculator.html target=_blank><font color=#000000>Get Widget</font></a></font><br> <input type=button value=" exp " onClick="if (checkNum(this.form.display.value)) { exp(this.form) }" name=button> <input type=button value=" 7 " onClick="addChar(this.form.display, '7')" name=button> <input type=button value=" 8 " onClick="addChar(this.form.display, '8')" name=button> <input type=button value=" 9 " onClick="addChar(this.form.display, '9')" name=button> <input type=button value=" / " onClick="addChar(this.form.display, '/')" name=button> <br> <input type=button value=" ln " onClick="if (checkNum(this.form.display.value)) { ln(this.form) }" name=button> <input type=button value=" 4 " onClick="addChar(this.form.display, '4')" name=button> <input type=button value=" 5 " onClick="addChar(this.form.display, '5')" name=button> <input type=button value=" 6 " onClick="addChar(this.form.display, '6')" name=button> <input type=button value=" * " onClick="addChar(this.form.display, '*')" name=button> <br> <input type=button value=" sqrt " onClick="if (checkNum(this.form.display.value)) { sqrt(this.form) }" name=button> <input type=button value=" 1 " onClick="addChar(this.form.display, '1')" name=button> <input type=button value=" 2 " onClick="addChar(this.form.display, '2')" name=button> <input type=button value=" 3 " onClick="addChar(this.form.display, '3')" name=button> <input type=button value=" - " onClick="addChar(this.form.display, '-')" name=button> <br> <input type=button value=" sq " onClick="if (checkNum(this.form.display.value)) { square(this.form) }" name=button> <input type=button value=" 0 " onClick="addChar(this.form.display, '0')" name=button> <input type=button value=" . " onClick="addChar(this.form.display, '.')" name=button> <input type=button value=" +/- " onClick=changeSign(this.form.display) name=button> <input type=button value=" + " onClick="addChar(this.form.display, '+')" name=button> <br> <input type=button value=" ( " onClick="addChar(this.form.display, '(')" name=button> <input type=button value=" cos " onClick="if (checkNum(this.form.display.value)) { cos(this.form) }" name=button> <input type=button value=" sin " onClick="if (checkNum(this.form.display.value)) { sin(this.form) }" name=button> <input type=button value=" tan " onClick="if (checkNum(this.form.display.value)) { tan(this.form) }" name=button> <input type=button value=" ) " onClick="addChar(this.form.display, ')')" name=button> <br> <input type=button value=" Clear " onClick="this.form.display.value = 0 " name=button> <input type=button value=" Back Space " onClick=deleteChar(this.form.display) name=button> <input type=button value=" =" name=enter onClick="if (checkNum(this.form.display.value)) { compute(this.form) }"></div> </form> </td></tr> </table> </center>


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