JavaScript exp method
We can perform the mathematical calculations in the JavaScript by using the Math object reference. In Math object we have some very useful functions in which exp() is one important function generally used by the programmers. The exp() method of Math object returns the value of ex , where "e" is the Euler's constant whose value is approximately 2.71828182846. Syntax for using exp() method is as given below:
Syntax:
| Math.exp( number); |
Description of Code:
In our following sample code we have created an input text which will take input by the user and when user clicks on the button "Show Expression's Value" it calls the function callExp() . This function takes the input number by calling document.getElementById() and then we have shown output expression value in the alert() message. Here is the full html code for expExample.html as follows:
expExample.html
| <html> <body> <script> function callExp(){ var val= document.getElementById("txt").value; alert(Math.exp(val)); } </script> <div style="background: #cf2255; width:'100%';" align="center"> <font color="#ffffcc" size="12pt"> <b>Exp Example</b> </font> </div> <center> <div style="background: #ffffcc; width:'100%';" align="center"> Input number :<input type="text" id="txt" value=""/> <button onclick="callExp();">Show Expression's Value</button> </div> </center> </body> </html> |
Output :
Input any number to call exp method on it.
