求和二维数组

Question

我想添加每个州的投票总数和这个二维数组的每个候选人的总和.

这些是要求:

• 修改程序,以便显示每个州投票的总票数
  (即,每行添加一列,汇总每个州所有候选人的总投票数)

• 修改程序,以便显示每个候选人的总投票数(即,添加最后一行,显示所有三列投票的总投票数)

  public static void main(String[] args) throws IOException
  {
  // TODO code application logic here
  File election = new File("voting_2008.txt");
  Scanner sc = new Scanner(election);
  
  String[] states = new String[51];
  int[][]votes = new int[51][4];
  int[] Totalbystate = new int[votes.length];
  
  for (int s=0; s < 51; s++)
  {
      states[s] = sc.nextLine();
  }
  
  for(int c=0; c < 3; c++)
  {
      for(int s=0; s < 51; s++)
      {
          votes[s][c] = sc.nextInt(); 
      }
  
  }
  Formatter fmt = new Formatter();
  fmt.format("%20s%12s%12s%12s%21s", "State", "Obama", "McCain", "Other", "Total by state");
  System.out.println(fmt);
  for (int s=0; s < 51; s++)
  {
     fmt = new Formatter();
     fmt.format("%20s", states[s]);
     System.out.print(fmt);
     for(int c=0; c < 3; c++)
     {
         fmt = new Formatter();
         fmt.format("%12d", votes[s][c]);
         System.out.print(fmt);
  
     }
     int sum =0;
     for(int row=0; row < votes.length; row++)
     {              
         for (int col=0; col < votes[row].length; col++)
         {
            sum = sum + votes[row][col];
         }
     }
         fmt = new Formatter();
         fmt.format("%21d", Totalbystate) ;  
     System.out.println();
  }
  

Answer 1

这个问题与求和无关,而且与格式化有关.只是这段代码将演示同样的问题:

int[] values = new int[10];
new Formatter().format("%21d", values);

目前还不清楚你对此的期望是什么,但我怀疑你实际上想做的事情如下:

// Please change your variable names to follow Java conventions
fmt = new Formatter(System.out);
for (int value : Totalbystate) {
    fmt.format("%21d", value);
}

或者,指定单个格式字符串,例如"%21d%21d%21d%21d%21d"(etc)并传入Integer[]而不是传入int[].

另外,你应该修复程序的缩进 - 这在目前是不必要的混乱.