Primary number

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vijay
Primary number
1 Answer(s)      5 years and 8 months ago
Posted in : Java Interview Questions

write a program to find the 100th or nth primary number?

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March 20, 2012 at 3:28 PM


import java.util.*;
class PrimeNumber{

    public static void main(String a[]) {
        Scanner input=new Scanner(System.in);
        System.out.print("Enter N:");
        int n=input.nextInt();
      find(n);
    }
      static void find(int n){
        int i=0,count=2;
        if(n==1)
        {
            return;
        }
        if(n==2)
        {
            return;
        }

        while(true)
        {
            for(int j=2;j<=i/2;j++){
            if(i%j==0)
            break;
            else if(j==i/2)
            {
            count++;
            }
        }
        if(count==n)
        {
        System.out.println(n+"th prime = "+i);
        break;
        }
        i++;
        }
    }
    }

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