Prime Number Program in Java

Prime Number Program in Java

A Prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. It means it is only divisible by 1 and itself, and it start from 2. The smallest prime number is 2. Here i will show you how to write this program. You can also download below code nad extract file, after extract file you can easily run the program.

import java.util.Scanner;
class Primenumber 
{
public static void main(String[] args) 
{
int no, i, fect=1;
Scanner s=new Scanner(System.in);
System.out.println("Enter any number :");
no=s.nextInt();
  if(no==1)
  {
  System.out.println("Smallest Prime number is 2");
  }
  for(i=2;i<no;i++)
  {
  if(no%i==0)
  {
  System.out.println("Not Prime");
  break;
  }
  }
 if(no==i)
 {
 System.out.println("Prime");
 }
}
}

Enter any number :
7
Prime

Syntax to compile and run java program

for compile -> c:/>javac Primenumber.java
for run -> c:/>java Primenumber

Explanation of Code

• Scanner s=new Scanner(System.in): are used for receive input from keyboard.
• nextInt(): method are used for get integer type value from keyboard.
• System.out.println("....."): are used for display message on screen or console.