產生立即終止訊號!!  Killed

 import java.util.Scanner; public class JAVA {     public static void main(String[] args) {         Scanner IN = new Scanner(System.in);         int a = 1, c = 0;         while (true) {             int b = IN.nextInt();             while (a <= b) {                 if (b % a == 0) {                     c = c + 1;                 }                 a = a + 1;             }             if (c == 2) {                 System.out.println("質數");             } else {                 System.out.println("非質數");             }         }     } } 

 我用netbeans都可以執行

判斷是否為質數也沒有問題 

為何他會說我執行時期錯誤??