# JavaScript > Code Examples

## 5 Function Calculator

``` 5 Function Calculator <HEAD> <title>Happy Codings :-) JavaScript Code Examples</title> <SCRIPT LANGUAGE="JavaScript"> <!-- Begin function a_plus_b(form) { a=eval(form.a.value) b=eval(form.b.value) c=a+b form.ans.value = c } function a_minus_b(form) { a=eval(form.a.value) b=eval(form.b.value) c=a-b form.ans.value=c } function a_times_b(form) { a=eval(form.a.value) b=eval(form.b.value) c=a*b form.ans.value=c } function a_div_b(form) { a=eval(form.a.value) b=eval(form.b.value) c=a/b form.ans.value = c } function a_pow_b(form) { a=eval(form.a.value) b=eval(form.b.value) c=Math.pow(a, b) form.ans.value = c } // End --> </SCRIPT> <BODY> <CENTER> <FORM name="formx"><input type=text size=4 value=12 name="a"> <input type="button" value=" + " onClick="a_plus_b(this.form)"> <input type="button" value=" - " onClick="a_minus_b(this.form)"> <input type="button" value=" x " onClick="a_times_b(this.form)"> <input type="button" value=" / " onClick="a_div_b(this.form)"> <input type="button" value=" ^ " onClick="a_pow_b(this.form)"> <input type="number" size=4 value=3 name="b"> = <input type "number" value=0 name="ans" size=9> </FORM> </CENTER> <p><center> <font face="arial, helvetica" size="8">Happy Codings :-) JavaScript Code Examples<br> by <a href="http://javascript.happycodings.com/">JavaScript Code Examples</a></font> </center><p> ```