输出中产生的随机数(C++)

Question

#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
using namespace std;



// declaration of functions sumArray() and printArray()
int sumArray(int [], int);

string printArray(string, string [], int [], int);

// declaration of main program
int main()
{
  string blue_members[10], white_members[10];
  int blue_scores[10], white_scores[10];

  // 1) connect to the input file
  ifstream fin("bowling.txt");
  // declare arrays below
  string Team, Member;
  int Score;

  // 2) initialize array accumulators to zero
  int blue = 0;
  int white = 0;

  // 3) display a descriptive message
  cout << "This program reads the lines from the file bowling.txt to determine\n"
       << "the winner of a bowling match.  The winning team, members and scores\n"
       << "are displayed on the monitor.\n\n";

  // 4) attempt to input the first line of the file
  fin >> Member >> Team >> Score;
  // 5) test ifstream.eof() condition
  while (!fin.eof())
    {
      // 6) test team color is blue
      if (Team == "Blue")
    {
      // 7) then store blue member and score
      blue_scores[blue] = Score;
      blue_members[blue] = Member;

      // 8) increase blue array accumulator
      blue++;
    }
      // 9) else store white member and score
      else
    {
      white_scores[white] = Score;
      white_members[white] = Member;

      // 10) increase white array accumulator
      white++;
    }
      // 11) attempt to input next line from file
      fin >> Member >> Team >> Score;
    }

  // 12) if blue team score is larger

  if (sumArray(blue_scores, blue) > sumArray(white_scores, white))
    {
    // 13 then display blue team as winner with the team
    printArray("Blue", blue_members, blue_scores, 10);
    }

  // 14) else display white team as winner with the team
  else
    {
    printArray("White", white_members, white_scores, 10);
    }
}

// implement function sumArray() below
int sumArray(int array_name[], int array_end)
{
  // 1. initialize accumulator to 0
  int sum = 0;

  // 2. loop over initialized array indices
  for (int i = 0; i < array_end; i++)

    //      3. increase accumulator by indexed array element
    sum += array_name[i];

  //   4. return accumulator
  return sum;
}

// implement function printArray() below
void printArray(string team_name, string array_name [], int array_score [], int array_end)
{
  // 1. display  the team name as the winner
  cout << setw(1) << "Winning Team: " << team_name<< endl;
  cout << setw(5) << "Player" << setw(7) << "Score" << endl;

  //   2. loop over initialized array indices
  for (int i = 0; i < array_end; i++)
    {
      //      3. display member and score for that array index
      cout << setw(3) << array_name[i] 
       << setw(6) << setfill(' ') << array_score[i] 
       << endl;
    }
}

Answer 1

问题是，当数组中没有10个有效条目时，您正在要求程序打印出数组的所有10个成员。这就是为什么你会在末尾得到随机数。

你需要改变（例如）

printArray("White", white_members, white_scores, 10);

至

printArray("White", white_members, white_scores, white);