Altprime.java

public class Altprime
{ public static void main(String[] args) 
 { int n =100,flag,num,i,temp=2; 
 System.out.println("Alternate prime numbers up to " + n+" are: \n"); 
 for(num = 2; num <= n-1; num++) 
 { flag=0;
 for(i = 2; i<= num / 2; i++) 
 { if(num%i==0)
 { flag=1;
 break;
 }
 else
 flag=0;
 }
 if(flag==0)
 { if(temp%2==0)
 System.out.print(num+"\t");
 temp++;
 }
 }
 }
}