Prime Number Calculator - JavaScript Made Easy: Free JavaScripts Tutorials Example Code

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Prime Number Calculator

Enter a number and JavaScript can instantly tell you if it is a prime number or not. I wish I had this little gem to help me in my math classes! Please enter a number:


Insert into <HEAD>
<SCRIPT LANGUAGE="JavaScript"> <!-- Begin function calculate(form) { var num=parseInt(form.number.value); if (isNaN(num) \|\| num < 0) { form.result.value=(form.number.value + " is not a valid number! Try again!"); } if (num == 1) { form.result.value=("1 is prime!"); } for (var i=2;i<num;i++) { if (num % i == 0) { var prime="yes"; form.result.value=(num + " is not prime. It is divisible by " + i + "."); break; } if (num % i != 0) var prime="no"; } if (prime == "no") form.result.value=(num + " is prime!"); } // End --> </SCRIPT>

Insert into <BODY>
<center> <form name=form> <h2>Prime Number Calculator</h2><p> Please enter a number:<br> <input type=text name=number size=7> <input type=button value="Calculate" onClick="calculate(this.form)"> <P> <input type=text name=result size=45 value=""> </form> </center>

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