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Tuesday, 5 July 2011

Write a program that read a number and check wheather it is prime or not


import java.util.*;
class prime
{
public static void main (String arg[])
{
Scanner in = new Scanner (System.in);

int a,b=2,c=1;
System.out.print ("\n\t Enter number = ");
a=in.nextInt();

do
{
if (a%b==0)
{
c=0;

}
++b;
}while (b<a/2);

if (c==1)
System.out.println ("\n\t Prime ");
else
System.out.println ("\n\t Not prime ");

}
}


Note:
          In this program, if a%b is equals to 0 it means there is a number which divides a properly, then c will assigned 0. After this process finishes, if condition will be evaluated and the result will be displayed according to the conditional expression.

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