在java中停止循環

Question

可能重複：
Taking average of user input number

for (int n1 = in.nextInt(); n1 >= 0; n1 = in.nextInt()) 
    { 
      int total = 0; 
      int count = 0; 

      while (n1 >= 0) 
      { 
        n1 = in.nextInt(); 
        total = total + n1; 
        count = count + 1; 

      } 
      out.println(total); 
      out.println(count); 
    } 

我想要的一切，我輸入要添加上的數字，這是正確的代碼？它只增加了我的最後2個輸入。我希望循環繼續下去，直到用戶輸入負數，然後循環停止，然後輸出我的總數和計數。

Scanner in = new Scanner(System.in); 
Printstream out = System.out; 

Answer 1

int total = 0; 
int count = 0; 

while (true) { 
    int n = in.nextInt(); 
    if (n < 0) 
     break; 
    total += n; 
    count ++; 
} 
out.println(total); 
out.println(count); 

Answer 2

您的代碼應該如下。

int total = 0; 
int count = 0; 
int n1; 

try 
{ 
    while((n1=Integer.parseInt(in.nextLine()))>=0) 
    { 
     total = total + n1; 
     count = count + 1; 
    } 
} 
catch(Exception e) 
{ 
    System.out.println(e.toString()); 
} 

out.println("Total  = "+total); 
out.println("Count  = "+count); 

Format df=new DecimalFormat("#.##"); 
out.println("Average = "+df.format((double)total/count));