整数Java太长了

Question

  public static void gramstoAtoms()
  {
   System.out.println("Enter Amount of grams");
   Scanner keyboard = new Scanner(System.in);
   long x = keyboard.nextLong();
   System.out.println("Enter Unit Grams");
   long y = keyboard.nextLong();
   long result = x/y;
   long answer = result*60200000000000000000000;
   System.out.println(answer + "Atoms");
  }

如何更改此代码,以便我不会得到一个整数太长的错误？

Answer 1

只需使用BigInteger而不是long

BigInteger bi=new BigInteger("6020000000000000000000");

对于你的方法:

public static void gramstoAtoms()
  {
   System.out.println("Enter Amount of grams");
   Scanner keyboard = new Scanner(System.in);
   String x = keyboard.nextLine();
   System.out.println("Enter Unit Grams");
   String y = keyboard.nextLine();
   BigInteger result = new BigInteger(x).divide(new BigInteger(y));
   BigInteger answer = result.multiply(new BigInteger("60200000000000000000000"));
   System.out.println(answer + "Atoms");
  }

如果你x和y小,你可以使用简单的长,但乘以602 ....... 0000使用BigInteger