Question

Write a java program to enter a number and find whether it is prime or not

Answer 1

Answer:

Here you go!

Explanation:

public class PrimeExample{    

public static void main(String args[]){    

 int i,m=0,flag=0;      

 int n=3;//it is the number to be checked    

 m=n/2;      

 if(n==0||n==1){  

  System.out.println(n+" is not prime number");      

 }else{  

  for(i=2;i<=m;i++){      

   if(n%i==0){      

    System.out.println(n+" is not prime number");      

    flag=1;      

    break;      

   }      

  }      

  if(flag==0)  { System.out.println(n+" is prime number"); }  

 }//end of else  

}    

}

Answer 2

Answer:

Check attached image

Code :

import java.util.*;

// Compiler version JDK 11.0.2

class Dcoder

{

public static void main(String args[])

{

int i,j, c=0;

Scanner sc = new Scanner (System.in);

System.out.println("Enter a no ");

i=sc.nextInt();

for(j=1;j<=i;j++)

{

if(i%j==0)

c++;

}

if(c==2)

System.out.println("Prime");

else

System.out.println("Not prime");

}

}