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C++文件读取与信息显示程序异常排查请求

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AI 小北
2026-8-5
问题描述

我编写的C++程序需读取superbowl.dat文件中的超级碗比赛数据（每行依次为获胜队名称、失利队名称、获胜队得分），预期实现以下功能：

  • 展示所有比赛的详细信息
  • 计算并输出获胜队的得分平均值
  • 统计得分超过40分的获胜队数量
  • 显示得分最高和最低的获胜队及其对应比赛信息

但当前程序的显示功能完全不符合预期，我咨询过同事与教授，调整过显示函数、优化过函数结构，花费数小时调试仍未解决问题。以下是完整代码与数据说明：

原代码实现 

//LIBRARIES
#include <iostream>
#include <iomanip>
#include <fstream>
#include <stdio.h>
#include <math.h>
#include <cmath>
#include <string>
#include <cstring>
#include <thread>
#include <stdexcept>
#include <limits>
#include <cctype>
using namespace std;


//STORED ARRAY NAMES AND FUNCTION NAMES
int fillArrays (string teamWin[], string teamLose[],
        float theScore[], ifstream & final);
float pointAverage (float theScore[], float numberOfGames);
int teamsScoredForty (float theScore[], int gameNum);
int savedMax (float theScore[], int gameNum);
int savedMin (float theScore[], int gameNum);
void printStoredInformation (string teamWin[], string teamLose[],
         float theScore[], int gameNum);
void finalDisplay (float theScore[], string teamWin[],
         string teamLose[], int teamsOverForty,
         float averagePoints, int maxSavedInfo, int minSavedInfo);


//START OF MAIN
int
main ()
{

  ifstream final;

  float theScore[100];
  string teamWin[100];
  string teamLose[100];

  int gameNum;
  float numberOfGames;

  float averagePoints;

  int teamsOverForty;

  int maxSavedInfo;
  int minSavedInfo;

  gameNum = fillArrays (teamWin, teamLose, theScore, final);

  numberOfGames = gameNum;

  averagePoints = pointAverage (theScore, numberOfGames);

  teamsOverForty = teamsScoredForty (theScore, gameNum);
  maxSavedInfo = savedMax (theScore, gameNum);
  minSavedInfo = savedMin (theScore, gameNum);

  printStoredInformation (teamWin, teamLose, theScore, gameNum);
  finalDisplay (theScore, teamWin, teamLose, teamsOverForty,
          averagePoints, maxSavedInfo, minSavedInfo);


  return 0;
}


//FINAL DISPLAY OF INFORMATION
void
finalDisplay (float theScore[], string teamWin[],
        string teamLose[], int teamsOverForty[],
        float averagePoints, int maxSavedInfo, int minSavedInfo)
{
  cout << "AVERAGE = " << averagePoints << endl;
  cout << "TEAMS WHO SCORED OVER 40 POINTS IN ONE GAME = " << teamsOverForty << endl;
  cout << endl;
  cout << endl;
  cout << "TEAM WHO SCORED THE MOST POINTS IN ONE GAME" << endl;
  cout << "WINNERS = " << teamWin[maxSavedInfo] << endl;
  cout << "LOSERS = " << teamLose[maxSavedInfo] << endl;
  cout << "FINAL SCORE OF WINNERS" << theScore[maxSavedInfo] << endl;
  cout << endl;
  cout << endl;
  cout << "TEAM WHO SCORED THE LEAST POINTS AND STILL WON" << endl;
  cout << "WINNERS = " << teamWin[minSavedInfo];
  cout << "LOSERS = " << teamLose[minSavedInfo];
  cout << "FINAL SCORE OF WINNERS = " << theScore[minSavedInfo];
  cout << endl;
}


//INFORMATION STORAGE FOR ARRAYS
int
fillArrays (string teamWin[], string teamLose[],
        float theScore[], ifstream & final)
{
  int i = 0;
  final.open ("superbowl.dat");
  while (!final.eof ())
    {
      getline (final, teamWin[i]);
      getline (final, teamLose[i]);
      final >> theScore[i];
      final.ignore (1, '\n');
      i += 1;
    }
  final.close ();
  return i;
}


//FUNCTION TO FIND AVERAGE OF THE TEAMS SCORE
float
pointAverage (float theScore[], float numberOfGames)
{
  float sum;
  float avg;

  for (int i = 0; i < numberOfGames; i++)
    {
      sum = sum + theScore[i];
    }
  avg = sum / numberOfGames;
  return avg;
}


//FUNCTION FOR ALL THE TEAMS WHO SCORED MORE THEN FORTY
int
teamsScoredForty (float theScore[], int gameNum)
{
  int teamSavedScoreOverForty = 0;

  for (int i = 0; i < gameNum; i++)
    {
      if (theScore[i] > 40)
    {
      teamSavedScoreOverForty = teamSavedScoreOverForty + 1;
    }
    }
  return teamSavedScoreOverForty;
}


//FUNCTION TO FIND WHICH TEAM SCORED MORE THEN ANY OTHER TEAM AND WON
int
savedMax (float theScore[], int gameNum)
{
  int val = -1;
  int idx;

  for (int i = 0; i < gameNum; i++)
    {
      if (val < theScore[i])
    {
      val = theScore[i];
      idx = 1;
    }
    }
  return idx;
}


//FUNCTION TO FIND WHICH TEAM SCORED LESS THEN ANY OTHER TEAM AND WON
int
savedMin (float theScore[], int gameNum)
{
  int val = theScore[0];
  int idx;
  for (int i = 0; i < gameNum; i++)
    {
      if (theScore[i] < val)
    {
      idx = i;
    }
    }
  return idx;
}


//FINAL DISPLAY FUNCTION FOR ALL OF THE INFORMATION ABOVE
void
printStoredInformation (string teamWin[], string teamLose[],
        float theScore[], int gameNum)
{

  int a = 1;

  for (int i = 0; i < gameNum; i++)
    {

      cout << "SUPER BOWL " << a << endl;
      cout << "NAME OF WINNING TEAM - " << teamWin[i] << endl;
      cout << "NAME OF LOSING TEAM - " << teamLose[i] << endl;
      cout << "TOTAL POINTS SCORED BY WINNERS - " << theScore[i] << endl;
      cout << endl;
      a = a + 1;
    }

}

文件数据格式

superbowl.dat文件每行依次存储：获胜队名称、失利队名称、获胜队得分，示例数据如下（每行单独换行）：

Packers
Chiefs
35
Packers
Raiders
33
Jets
Colts
16
...（剩余数据略）

问题排查与修复方案

以下是程序中存在的核心错误及修复方式：

  1. finalDisplay函数参数类型不匹配
    函数声明中teamsOverForty为int类型，但定义时错误写成数组int teamsOverForty[]，导致调用时类型冲突。
    修复：将函数定义的参数改为int teamsOverForty，与声明保持一致。

  2. pointAverage函数未初始化累加变量
    sum未初始化就直接累加，会导致平均值计算为随机垃圾值。
    修复：初始化sum = 0.0f;。

  3. savedMax函数逻辑错误
    找到更大得分时，错误将索引idx赋值为1而非当前循环的i，导致永远返回第2个元素的索引。同时idx未初始化，存在未定义行为。
    修复：初始化idx = 0;，并将idx = 1;改为idx = i;。

  4. savedMin函数逻辑错误

    • idx未初始化，若第一个元素为最小值，返回值为垃圾值
    • 未更新val的值，导致后续比较始终使用初始的theScore[0]，无法正确找到最小值
      修复：初始化idx = 0;，并在更新idx时同步更新val = theScore[i];。

  5. fillArrays函数循环条件问题
    使用!final.eof()作为循环条件会导致最后一组数据被重复读取，因为eof()仅在读取失败后才会置位。
    修复：将循环条件改为读取操作的结果，同时优化ignore的写法避免遗漏换行：

    while (getline(final, teamWin[i]) && getline(final, teamLose[i]) && (final >> theScore[i])) {
    final.ignore(numeric_limits<streamsize>::max(), '\n');
    i++;
}

  6. finalDisplay函数输出格式错误
    得分最高队伍的输出行缺少等号，得分最低队伍的输出无换行，可读性差。
    修复：补全等号，添加换行符：

    cout << "FINAL SCORE OF WINNERS = " << theScore[maxSavedInfo] << endl;
// ...
cout << "WINNERS = " << teamWin[minSavedInfo] << endl;
cout << "LOSERS = " << teamLose[minSavedInfo] << endl;
cout << "FINAL SCORE OF WINNERS = " << theScore[minSavedInfo] << endl;

修正后的完整代码 

//LIBRARIES
#include <iostream>
#include <iomanip>
#include <fstream>
#include <stdio.h>
#include <math.h>
#include <cmath>
#include <string>
#include <cstring>
#include <thread>
#include <stdexcept>
#include <limits>
#include <cctype>
using namespace std;


//STORED ARRAY NAMES AND FUNCTION NAMES
int fillArrays (string teamWin[], string teamLose[],
        float theScore[], ifstream & final);
float pointAverage (float theScore[], float numberOfGames);
int teamsScoredForty (float theScore[], int gameNum);
int savedMax (float theScore[], int gameNum);
int savedMin (float theScore[], int gameNum);
void printStoredInformation (string teamWin[], string teamLose[],
         float theScore[], int gameNum);
void finalDisplay (float theScore[], string teamWin[],
         string teamLose[], int teamsOverForty,
         float averagePoints, int maxSavedInfo, int minSavedInfo);


//START OF MAIN
int main ()
{
  ifstream final;

  float theScore[100];
  string teamWin[100];
  string teamLose[100];

  int gameNum;
  float numberOfGames;

  float averagePoints;

  int teamsOverForty;

  int maxSavedInfo;
  int minSavedInfo;

  gameNum = fillArrays (teamWin, teamLose, theScore, final);

  numberOfGames = gameNum;

  averagePoints = pointAverage (theScore, numberOfGames);

  teamsOverForty = teamsScoredForty (theScore, gameNum);
  maxSavedInfo = savedMax (theScore, gameNum);
  minSavedInfo = savedMin (theScore, gameNum);

  printStoredInformation (teamWin, teamLose, theScore, gameNum);
  finalDisplay (theScore, teamWin, teamLose, teamsOverForty,
          averagePoints, maxSavedInfo, minSavedInfo);

  return 0;
}


//FINAL DISPLAY OF INFORMATION
void finalDisplay (float theScore[], string teamWin[],
        string teamLose[], int teamsOverForty,
        float averagePoints, int maxSavedInfo, int minSavedInfo)
{
  cout << "AVERAGE = " << averagePoints << endl;
  cout << "TEAMS WHO SCORED OVER 40 POINTS IN ONE GAME = " << teamsOverForty << endl;
  cout << endl << endl;
  
  cout << "TEAM WHO SCORED THE MOST POINTS IN ONE GAME" << endl;
  cout << "WINNERS = " << teamWin[maxSavedInfo] << endl;
  cout << "LOSERS = " << teamLose[maxSavedInfo] << endl;
  cout << "FINAL SCORE OF WINNERS = " << theScore[maxSavedInfo] << endl;
  cout << endl << endl;
  
  cout << "TEAM WHO SCORED THE LEAST POINTS AND STILL WON" << endl;
  cout << "WINNERS = " << teamWin[minSavedInfo] << endl;
  cout << "LOSERS = " << teamLose[minSavedInfo] << endl;
  cout << "FINAL SCORE OF WINNERS = " << theScore[minSavedInfo] << endl;
}


//INFORMATION STORAGE FOR ARRAYS
int fillArrays (string teamWin[], string teamLose[],
        float theScore[], ifstream & final)
{
  int i = 0;
  final.open ("superbowl.dat");
  
  while (getline(final, teamWin[i]) && getline(final, teamLose[i]) && (final >> theScore[i])) {
      final.ignore(numeric_limits<streamsize>::max(), '\n');
      i++;
  }
  
  final.close ();
  return i;
}


//FUNCTION TO FIND AVERAGE OF THE TEAMS SCORE
float pointAverage (float theScore[], float numberOfGames)
{
  float sum = 0.0f;
  float avg;

  for (int i = 0; i < numberOfGames; i++)
  {
      sum += theScore[i];
  }
  avg = sum / numberOfGames;
  return avg;
}


//FUNCTION FOR ALL THE TEAMS WHO SCORED MORE THEN FORTY
int teamsScoredForty (float theScore[], int gameNum)
{
  int teamSavedScoreOverForty = 0;

  for (int i = 0; i < gameNum; i++)
  {
      if (theScore[i] > 40)
      {
          teamSavedScoreOverForty++;
      }
  }
  return teamSavedScoreOverForty;
}


//FUNCTION TO FIND WHICH TEAM SCORED MORE THEN ANY OTHER TEAM AND WON
int savedMax (float theScore[], int gameNum)
{
  int val = theScore[0];
  int idx = 0;

  for (int i = 1; i < gameNum; i++)
  {
      if (val < theScore[i])
      {
          val = theScore[i];
          idx = i;
      }
  }
  return idx;
}


//FUNCTION TO FIND WHICH TEAM SCORED LESS THEN ANY OTHER TEAM AND WON
int savedMin (float theScore[], int gameNum)
{
  int val = theScore[0];
  int idx = 0;
  
  for (int i = 1; i < gameNum; i++)
  {
      if (theScore[i] < val)
      {
          val = theScore[i];
          idx = i;
      }
  }
  return idx;
}


//FINAL DISPLAY FUNCTION FOR ALL OF THE INFORMATION ABOVE
void printStoredInformation (string teamWin[], string teamLose[],
        float theScore[], int gameNum)
{
  int a = 1;

  for (int i = 0; i < gameNum; i++)
  {
      cout << "SUPER BOWL " << a << endl;
      cout << "NAME OF WINNING TEAM - " << teamWin[i] << endl;
      cout << "NAME OF LOSING TEAM - " << teamLose[i] << endl;
      cout << "TOTAL POINTS SCORED BY WINNERS - " << theScore[i] << endl;
      cout << endl;
      a++;
  }
}

内容的提问来源于stack exchange，提问作者John Walker

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最近更新时间：2026.08.05 21:10:59