In this javascript tutorial we are learning about whether a check number is prime or not using javascript.
Prime number
A prime number is an integer number which is divide by 1 and itself only
Prime number is greater than 1. Prime number is not less than 1.
Prime number can't divide by its remainder.
Ex. 5 is a prime number because 5 is not divided by its remainder by 2, 3, 4.
example
Input : 4 Output : not prime number
input : 5 Output : is a prime number |
Logic
for(i=2;i<=n-1;i++) if(n%i==0) { flag=false; break; } if(flag==true) alert(n+"is a prime number"); else alert(n+"is no a prime number") } |
//write a javascript program to check the given number is prime or not
<html> <head> <title> prime number </title> <script type="text/javascript"> //function to check prime number function p(){ var n, i, flag=true; // getting the value from the from text //field using DOM n=document.myform.n.value; n=parseInt(n) for(i=2;i<=n-1;i++) if(n%i==0) { flag=false; break; } //check and display aleart message if(flag==true) alert(n+"is a prime number"); else alert(n+"is no a prime number") } </script> </head> <body style="font-size:30px"> <h2>javascript to find prime number or not</h2> <form name="myform"> enter a number:<input type="text" name=n value=" "> <br><br> <input type="button" value="click" onclick="p()"> <br> </form> </body> </html> |
output:
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