Question

// id         scores
    2000    62  40
    3199    92  97
    4012    75  65
    6547    89  81
    1017    95  95
    7714    85  83
    1234    91  76//AG_midterm.txt

任务：从文件中读取数据，丢弃学生ID，计算两次期中考试的平均值，并将其存储到数组中并将平均值写入另一个文件（AG_sorted.txt）

我面临错误，我似乎无法弄清楚问题。我尽力做到尽可能整洁。

#include <stdio.h>
#include <stdlib.h>

#define MAX_SIZE 50

// Function declarations
void printInfo();
int readresults(FILE *AG_Midterm, int *score1, int *score2);
void sort(float* avgScore);
void calcAvg (FILE *AG_Midterm, float* avgScore, int score1, int score2);
void writeSortedResults (FILE* AG_Sorted, float* avgScore);
void printdone();

int main (void)
{
// Local Declarations
    FILE* AG_Midterm;
    FILE* AG_Sorted;

    int score1[MAX_SIZE];
    int score2[MAX_SIZE];

    float avgScore[MAX_SIZE];

// Statements
    printInfo();

    if(!(AG_Midterm = fopen ("/Users/r3spectak/Desktop/AG_Midterm.txt", "r")))
        {
          printf("\aError opening Results File\n");
          return 100;

        } // if open input

    if(!(AG_Sorted = fopen ("/Users/r3spectak/Desktop/AG_Sorted.txt","w")))
       {
          printf("\aError opening Average Results file\n");
          return 102;
        }// if open input

    while(readresults(AG_Midterm, score1, score1))
        {
          calcAvg(AG_Midterm,&avgScore,score1,score2);
          sort(avgScore);
          writeSortedResults(AG_Sorted, avgScore);

        } //while

    fclose (AG_Midterm);
    fclose (AG_Sorted);

    printdone();
    return 0;

} // main

/*==================printInfo==================================
    Reads data from Midterm file
    Pre : Nothing
    Post: Prints introduction message
*/
void printInfo()

{
// Statements
    printf("Begin Calculation of Scores\n");
    return ;
} // printInfo


/*===================readResults==================================
    Reads data from employee file
    Pre : spEmp is an open file.
          empID,dept,payrate,exempt,hours worked
    Post: reads Employee ID and Pay rate
          if data read -- returns 1
          if EOF or error--returns 0
*/

int readresults(FILE *AG_Midterm, int *score1, int *score2)
{
// Statements

  int i;
  int items;

  for (i = 0; i < MAX_SIZE && (items = fscanf(AG_Midterm, "%*d%d%d", score1 + i, score2 + i)) != EOF;
      i++) {
    if (items != 2) {
      printf( "Error reading data\n");
      return -1;
    }
  }
  return 0;
} //readresults

void sort(float*avgScore)
{

    int i = 0;
    int j = 0;

    for(i = 0; i< MAX_SIZE; i++);

    {
        for(j = i + 1; j < 10; j++)
        {
            if(avgScore[i] < avgScore[j])
            {
               //Exchange them
            int temp = avgScore[i];
                avgScore[i] = avgScore[j];
                avgScore[j] = temp;
            }
       }
   }
return;

} // sort


/*===================calcAvg==================================
    Determines the Average of the two midterm scores
    Pre : score1, score2
    Post: avgScore copied to addresses

*/

void calcAvg (FILE *AG_Midterm, float* avgScore, int score1 , int score2)

{
    int i=0;
// Statements
   while (i<MAX_SIZE && fscanf(AG_Midterm,"%*d %d %d", &score1, &score2)!=EOF)
   {
       avgScore[i] = (score1 + score2)/2.0;
       i++;
   }

} // calcAvg


/*===================writeSortedResults==================================
    Writes Average Scores after Sorting
    Pre : AG_Sorted is an open file
          avgScore
    Post: Data written to file
*/
void writeSortedResults (FILE* AG_Sorted, float* avgScore)
{

// Statements
    fprintf(AG_Sorted, "%f\n", avgScore);
    return;


} // writeSortedResults

/*==================printDone==================================
    Reads data from Midterm Score File
    Pre : Nothing
    Post: Prints end message
*/
void printdone()

{
// Statements
    printf("End of Average Score\n");
    return;
} // printDone

Answer 1

您的代码通常会反复将数据与数据地址混淆。例如，行

while(readresults(AG_Midterm, &score1, &score1))

应该阅读

while(readresults(AG_Midterm, score1, score1))

所以，问题似乎是一个普遍的概念问题，而不是一个错误，而你可能还没有能够解决它。您可以先尝试一些更简单的方法，然后再回到此代码。（如果它是早上到期的家庭作业，那么时间已经很晚了：你可能无法在一个晚上学到你需要知道的东西。希望这个答案至少指向你正确的部分你的教科书。祝你好运。）

从文件中读取整数并将它们存储到数组中并写入文件

1 个答案: