Java的藝術與科學第4章練習13

Question

應該運行一個打印最大和次大的程序，但在獲得第二個值時遇到問題。認爲我的布爾表達式是錯誤的，因爲我一直得到0作爲tempSecond。你能幫我嗎？

/* 
* File: AddExamIntegers.java 
* -------------------- 
* This program takes a list of integers until Sentinel, 
* then prints the largest and second largest. 
*/ 

import acm.program.*; 

public class FindLargest extends ConsoleProgram { 


    public void run() { 
     println("This program takes a list of integers and then lists the largest and second largest"); 
     println(""); 
     println("Enter positive numbers using " + SENTINEL); 
     println("to signal the end of the list"); 

     int tempHigh = 0; 
     int tempSecond = 0; 

     while (true) { 
      int value = readInt(": "); 
      if (value == SENTINEL) break; 
       if (tempHigh < value) { 
        tempHigh = value; 
        } 
       if ((tempSecond < value) && (tempSecond > tempHigh)) { 
        tempSecond = value; 
        } 
     } 
     println("The largest value is " + tempHigh); 
     println("The second largest value is " + tempSecond); 
    } 

    private static final int SENTINEL = 0; 

} 

Answer 1

你的後面，如果將永遠不會真正的第二部分：tempSecond > tempHigh

相反，這樣做：

 if(tempHigh < value) 
     { 
      tempHigh = value; 
     } 
     else if(tempSecond < value) 
     { 
      tempSecond = value; 
     }