<!-- TWO STEPS TO INSTALL YOUR SCIENTIFIC CALCULATOR: 1. Paste the designated coding into the HEAD of your HTML document 2. Put the last script into the BODY of your HTML document --> <!-- STEP ONE: Copy this code into the HEAD of your HTML document --> <HEAD> <SCRIPT LANGUAGE="JavaScript"> <!--Total Java Scripts 99 - Next Step Software--> <!-- 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> <!-- STEP TWO: Copy this code into the BODY of your HTML document --> <BODY> <CENTER> <FORM> <input name="display" value="0" size=25></td> <br> <input type="button" value=" exp " onClick="if (checkNum(this.form.display.value)) { exp(this.form) }"> <input type="button" value=" 7 " onClick="addChar(this.form.display, '7')"> <input type="button" value=" 8 " onClick="addChar(this.form.display, '8')"> <input type="button" value=" 9 " onClick="addChar(this.form.display, '9')"> <input type="button" value=" / " onClick="addChar(this.form.display, '/')"> <br> <input type="button" value=" ln " onClick="if (checkNum(this.form.display.value)) { ln(this.form) }"> <input type="button" value=" 4 " onClick="addChar(this.form.display, '4')"> <input type="button" value=" 5 " onClick="addChar(this.form.display, '5')"> <input type="button" value=" 6 " onClick="addChar(this.form.display, '6')"> <input type="button" value=" * " onClick="addChar(this.form.display, '*')"> <br> <input type="button" value=" sqrt " onClick="if (checkNum(this.form.display.value)) { cos(this.form) }"> <input type="button" value=" 1 " onClick="addChar(this.form.display, '1')"> <input type="button" value=" 2 " onClick="addChar(this.form.display, '2')"> <input type="button" value=" 3 " onClick="addChar(this.form.display, '3')"> <input type="button" value=" - " onClick="addChar(this.form.display, '-')"> <br> <input type="button" value=" sq " onClick="if (checkNum(this.form.display.value)) { square(this.form) }"> <input type="button" value=" 0 " onClick="addChar(this.form.display, '0')"> <input type="button" value=" . " onClick="addChar(this.form.display, '.')"> <input type="button" value=" +/- " onClick="changeSign(this.form.display)"> <input type="button" value=" + " onClick="addChar(this.form.display, '+')"> <br> <input type="button" value=" ( " onClick="addChar(this.form.display, '(')"> <input type="button" value=" cos " onClick="if (checkNum(this.form.display.value)) { cos(this.form) }"> <input type="button" value=" sin " onClick="if (checkNum(this.form.display.value)) { sin(this.form) }"> <input type="button" value=" tan " onClick="if (checkNum(this.form.display.value)) { tan(this.form) }"> <input type="button" value=" ) " onClick="addChar(this.form.display, ')')"> <br> <input type="button" value=" Clear " onClick="this.form.display.value = 0 "> <input type="button" value=" Back Space " onClick="deleteChar(this.form.display)"> <input type="button" value=" Enter " name="enter" onClick="if (checkNum(this.form.display.value)) { compute(this.form) }"> </FORM> </CENTER> <!-- Script Size: 4.63 KB -->

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