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Generate series of prime numbers using java


import java.io.*;
class prime_series
{
   public static void main(String args[])
  { int st,end;
    int flag=0;
    DataInputStream in=new DataInputStream(System.in);
    System.out.print("Enter starting range: ");
    st=Integer.parseInt(in.readLine());
    System.out.print("\nEnter ending range: ");
    end=Integer.parseInt(in.readLine());
    for(int i=st;i<=end;i++)
    {
     for(int j=2;j<=i/2;j++)
     { if(i%j==0)
        { flag=1;
           break;
         }
       else
        flag=0;
     }
     if(flag==0)
      System.out.print(i + " ");
    }
  }
}
   

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