排序打印不正确，排序可能有误。我也不确定如何在每个字符串的平均成绩中排名。
下面是输出示例：
Original:
+-------------------------+--------------+------+------+---------+---------+-------+-----+
| Student Name|Identification|Exam 1|Exam 2|Project 1|Project 1|Average|Grade|
+-------------------------+--------------+------+------+---------+---------+-------+-----+
| Holtkamp, Norman| N21102485| 83| 61| 62| 78| 71.00| C|
| Bellomy, Shavonda| N94185259| 74| 96| 80| 98| 87.00| B|
| Clutter, Loris| N68760306| 83| 68| 93| 70| 78.50| C|
| Rountree, Edythe| N76813896| 98| 91| 90| 81| 90.00| A|
| Waldeck, Marylee| N44293872| 88| 100| 70| 87| 86.25| B|
+-------------------------+--------------+------+------+---------+---------+-------+-----+
Sorted:
+-----+-------------------------+--------------+------+------+---------+---------+-------+-----+
|Index| Student Name|Identification|Exam 1|Exam 2|Project 1|Project 1|Average|Grade|
+-----+-------------------------+--------------+------+------+---------+---------+-------+-----+
| 1 | Rountree, Edythe| N76813896| 98| 91| 90| 81| 90.00| A|
| 2 | Bellomy, Shavonda| N94185259| 74| 96| 80| 98| 87.00| B|
| 3 | Waldeck, Marylee| N44293872| 88| 100| 70| 87| 86.25| B|
| 4 | Clutter, Loris| N68760306| 83| 68| 93| 70| 78.50| C|
| 5 | Holtkamp, Norman| N21102485| 83| 61| 62| 78| 71.00| C|
+-----+-------------------------+--------------+------+------+---------+---------+-------+-----+
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
//Struct groups each line in the file
struct gradesRecord
{
int iIndex; // index on the file
char cStudentName[26]; // student name field
char iStudentINDnum[9]; // 'Student id ' field
int iExamGrouped[2]; // 'Exam 1'..'Exam 2' fields
int iProjectGrouped[2];
float fAverage;
char cStudentGD; // 'Grade' field
};
void printUnsortedStringFromFile(int amount, struct gradesRecord A[]);
void printSortedStringFromFile(int amount, struct gradesRecord A[]);
void flushScanf();
int main()
{
FILE* spData = fopen("records.ssv", "r");
int ch, number_of_lines = 0;
do
{
ch = fgetc(spData);
if (ch == '\n')
number_of_lines++;
} while (ch != EOF);
if (ch != '\n' && number_of_lines != 0)
number_of_lines++;
fclose(spData);
printf("There are %d lines in file records.ssv . \n", number_of_lines);
int amount = number_of_lines;
struct gradesRecord A[amount];
printUnsortedStringFromFile(amount, A );
printSortedStringFromFile(amount, A );
//flushScanf();
return 0;
}
/*
* Function Name: printUnsortedStringFromFile
*
* Input Parameters: takes array A
*
* Description: This fuction prints the original list that was unsorted in grades.csv
*
* Return Value: void
*/
void printUnsortedStringFromFile(int amount, struct gradesRecord A[amount])
{
FILE *spData;
spData = fopen("records.ssv", "r");
if(spData == NULL)
{
fprintf(stderr, "Error opening the file records.ssv.\n");
exit(1);
}
printf("+---------------------+--------------+------+------+---------+---------+-----+\n");
printf("| Student Name|Identification|Exam 1|Exam 2|Project 1|Project 2|Grade|\n");
printf("+---------------------+--------------+------+------+---------+---------+-----+\n");
char sLine[amount]; //local string to read one row
int j = 0; //storage index
while((fgets(sLine, amount, spData)) != NULL)
{
sscanf(sLine, "%20[^;] ; %9[^;] ; %5d ; %5d ; %5d ; %5d ; %c",
A[j].cStudentName, A[j].iStudentINDnum, &(A[j].iExamGrouped[0]), &(A[j].iExamGrouped[1]),
&(A[j].iProjectGrouped[0]), &(A[j].iProjectGrouped[1]), &(A[j].cStudentGD));
if(strcmp(A[j].cStudentName, " ")> 0){
printf("| %20s| %9s| %5d| %5d| %5d| %5d| %c| \n",
A[j].cStudentName, A[j].iStudentINDnum, A[j].iExamGrouped[0], A[j].iExamGrouped[1],
A[j].iProjectGrouped[0], A[j].iProjectGrouped[1], A[j].cStudentGD);
}
j++; // next row
}
printf("+---------------------+--------------+------+------+---------+---------+-----+\n");
if (fclose(spData) == EOF)
{
fprintf(stderr, "Error closing the file records.ssv. \n");
exit(2);
}
}
/*
* Function Name: printSortedStringFromFile
*
* Input Parameters: takes int amount, struct gradesRecord A
*
* Description: This function prints the sorted version of the file grades.csv omitting
* the exam values and giving each string a index number
*
* Return Value: void
*/
void printSortedStringFromFile(int amount, struct gradesRecord A[amount])
{
FILE *spData;
spData = fopen("records.ssv", "r");
if(spData == NULL)
{
fprintf(stderr, "Error opening the file grades.csv.\n");
exit(1);
}
char sLine[amount];
int iLine = 0, iRow;
int x;
struct gradesRecord grRow;
while((fgets(sLine, amount, spData)) != NULL)
{
// extract one Row and store it into grRow
sscanf(sLine, "%20[^;] ; %9[^;] ; %5d ; %5d ; %5d ; %5d ; %2.2f ; %c",
grRow.cStudentName, grRow.iStudentINDnum, &(grRow.iExamGrouped[0]), &(grRow.iExamGrouped[1]),
&(grRow.iProjectGrouped[0]), &(grRow.iProjectGrouped[1]), &(grRow.fAverage), &(grRow.cStudentGD));
// keep the line index of that row
grRow.iIndex = iLine;
// target loop = Selection sort algorithm
for (iRow = 0; iRow < iLine - 1; iRow++){
for(x = iRow + 1; x < iLine; x++){
if (A[iRow].cStudentGD < A[x].cStudentGD) {
struct gradesRecord tmp = A[iRow];
A[iRow] = A[x];
A[x] = tmp;
}
}
}
int j = 0;
printf("+-----+---------------------+--------------+------+------+---------+---------+-------+-----+\n");
printf("|Index| Student Name|Identification|Exam 1|Exam 2|Project 1|Project 2|Average|Grade|\n");
printf("+-----+---------------------+--------------+------+------+---------+---------+-------+-----+\n");
int index;
while (j < amount - 1)
{
index = j+1;
printf("| %4d| %20s| %9s| %5d| %5d| %5d| %5d| %2.2f| %c| \n",
index, A[j].cStudentName, A[j].iStudentINDnum, A[j].iExamGrouped[0], A[j].iExamGrouped[1],
A[j].iProjectGrouped[0], A[j].iProjectGrouped[1], A[j].fAverage, A[j].cStudentGD);
j++;
}
printf("+----+---------------------+--------------+------+------+---------+---------+-----+\n");
if (fclose(spData) == EOF)
{
fprintf(stderr, "Error closing the file records.ssv. \n");
exit(2);
}
}
}
这是“records.ssv”的信息
莱利亚装甲车；N58288536；89；82；91；65；B
巴斯勒，詹妮弗；N42495906；74；71；87；91；B
莱顿，辛迪；N66735910；67；93；76；79；C
卡洛琳主教；N85576519；86；94；92；69；B
鲁西，卡利；N55890919；86；84；88；87；B
花呢，米尔塔；N94974972；62；95；85；92；B
方特诺，玫瑰花结；N44585447；98；62；74；74；C
诺曼霍尔特坎普；N21102485；83；61；62；78；C
贝洛米，沙文达；N94185259；74；96；80；98；B
杂波，洛里斯；N68760306；83；68；93；70；C
朗特里，埃德斯；N76813896；98；91；90；81；A
马里兰州沃尔德克；N44293872；88；100；70；87；B
普特南，图耶；N82771281；69；99；68；67；C
迈克尔斯，阿奈特；N33948917；86；65；99；64；C
斯特劳德，温多林；N05586646；86；64；80；97；B
蒙图法，梅尔文；N36545740；80；61；74；92；C
费伊，莱塔；N61908241；73；89；71；68；C
德鲁纳，沃恩；N74322300；94；69；67；60；C
玛格丽塔韦弗；N37176367；95；92；95；70；B
白金汉，莱纳；N87562246；95；64；89；71；C
弗里德利，维罗纳；N53223806；67；83；71；61；C
格拉迪斯埃巴；N66138130；89；70；87；90；B
莫尼卡提琴诺尔；N40314334；88；62；62；100；C
多兰，中篇小说；N24182986；78；62；65；71；D
雷耶，马西；N64652923；89；95；72；76；B
肯德尔，罗马；N22064372；91；84；72；88；B
布兰诺克，亨利特；N19795353；67；92；63；90；C
莱恩，克林特；N83838870；88；83；82；77；B
莱琴巴赫，沙伦；N02253867；81；96；91；73；B
埃弗斯，汉娜；N05833153；75；79；75；98；B
阿马尔·雷吉纳；N52372967；95；73；73；89；B
莱特尔，德斯蒙德；N81006603；75；66；61；71；D
也门，In；N30566266；89；99；98；89；A
加林，尼雷达；N05192538；89；92；74；99；B
汉娜，阿森塔；N39624931；91；80；72；80；B
丹科，米根；N47365488；79；67；86；65；C
乌里奇，处女；N57019166；70；82；72；88；C
埃梅琳达，查普拉；N38233556；93；83；60；87；B
哈普，米娜；N46726472；84；98；60；66；C
德洛里斯苏特尔特；N88538002；86；71；82；82；B
巴勒莫，肯纳；N44857147；72；69；83；75；C
美国，威德曼；N29831009；86；78；89；81；B
塞义德，鲁斯；N47933985；78；62；99；99；B
科林，布雷尔；N75299461；77；85；99；99；A
埃迪赫克特；N58264115；92；96；96；89；A
丹佛波利；N77063394；99；95；65；95；B
韦弗，布兰奇；N59717716；66；80；89；80；C
基布尔，格林达；N68212959；94；95；66；94；B
威利斯柯克；N17878125；71；60；87；79；C
利维赛，阿里；N91011529；89；60；60；84；C
最佳答案
在printUnsortedStringFromFile()和printSortedStringFromFile()中
sscanf(sLine, "%20[^;]…
要读入
cStudentName，但20字符不足以读入Reichenbach, Sharleen。既然定义了char cStudentName[26];，那么25的最大字段宽度就足够了。你有
sscanf(sLine, "… %2.2f ; …
在
printSortedStringFromFile()中读取，但在grRow.fAverage中没有此字段，并且从未初始化records.ssv。你说分类可能是错的是对的。这是因为在排序之前没有设置
A[j].fAverage：iLine = amount-1; // You know that your 'amount' is 1 too high, don't you?
关于c - 如何使用C中的结构和选择排序按字符串对文件排序，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/40924100/