用C语言写个学生成绩管理系统程序

Question

现有学生成绩信息文件1（1.txt），内容如下
姓名 学号 语文 数学 英语
张明明 01 67 78 82
李成友 02 78 91 88
张辉灿 03 68 82 56
王露 04 56 45 77
陈东明 05 67 38 47
…. .. .. .. …
学生成绩信息文件2（2.txt）,内容如下:
姓名 学号 语文 数学 英语
陈果 31 57 68 82
李华明 32 88 90 68
张明东 33 48 42 56
李明国 34 50 45 87
陈道亮 35 47 58 77
…. .. .. .. …
试编写一管理系统,要求:
（1）实现对两个文件数据进行合并,生成新文件3.txt
（2）抽取出三科成绩中有补考的学生并保存在一个新文件4.txt
（3）对合并后的文件3.txt中的数据按总分降序排序(至少采用三种排序方法)
在线等待，可以用Q币补充QQ309469675

Answer 1

楼上的一看就是抄的，一点注释都没有。

你也真够辛苦的，加油，挣点分不容易。

Answer 2

#include <memory.h> /* TC mem.h */
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>

#define FILE1 "1.txt"
#define FILE2 "2.txt"
#define FILE3 "3.txt"
#define FILE4 "4.txt"
struct STUDENT
{
char name[20];
int number;
int chinese;
int math;
int english;
int total;
};
typedef STUDENT student;
int count = 0;
student *ss = NULL;

void combine2files()
{
FILE *in, *out;
student s;

out = fopen(FILE3, "w");
in = fopen(FILE1, "r");

if (!in || !out)
{
printf("can't open file(s)\n");
exit(-1);
}

while (1)
{
s.name[0] = '\0';
fscanf(in, "%s %d %d %d %d", s.name, &s.number, &s.chinese, &s.math, &s.english);

if (s.name[0] == '\0')
break;

++count;
fprintf(out, "%s %d %d %d %d\n", s.name, s.number, s.chinese, s.math, s.english);
/* printf("%s %d %d %d %d\n", s.name, s.number, s.chinese, s.math, s.english); */
}

fclose(in);
fflush(in);
in = fopen(FILE2, "r");

if (!in)
{
fclose(out);
printf("can't open file\n");
exit(-1);
}

while (1)
{
s.name[0] = '\0';
fscanf(in, "%s %d %d %d %d", s.name, &s.number, &s.chinese, &s.math, &s.english);

if (s.name[0] == '\0')
break;

++count;
fprintf(out, "%s %d %d %d %d\n", s.name, s.number, s.chinese, s.math, s.english);
/* printf("%s %d %d %d %d\n", s.name, s.number, s.chinese, s.math, s.english); */
}

fclose(in);
fclose(out);
}

void check4makeup()
{
FILE *in, *out;
student s;

out = fopen(FILE4, "w");
in = fopen(FILE3, "r");

if (!in || !out)
{
printf("can't open file(s)\n");
exit(-1);
}

while (1)
{
s.name[0] = '\0';
fscanf(in, "%s %d %d %d %d", s.name, &s.number, &s.chinese, &s.math, &s.english);

if (s.name[0] == '\0')
break;

if (s.chinese < 60 || s.math < 60 || s.english < 60)
fprintf(out, "%s %d %d %d %d\n", s.name, s.number, s.chinese, s.math, s.english);
}

fclose(in);
fclose(out);
}

void selectsort(int type = 0)
{
int i, j, k;
student s;

for (i = 0; i < count - 1; ++i)
{
k = i;
for (j = i + 1; j < count; ++j)
{
if (type == 0)
{
if (ss[k].total < ss[j].total)
k = j;
}
else
{
if (strcmp(ss[k].name, ss[j].name) < 0)
k = j;
}
}

if (k != i)
{
memcpy(&s, &ss[i], sizeof(student));
memcpy(&ss[i], &ss[k], sizeof(student));
memcpy(&ss[k], &s, sizeof(student));
}
}
}

void bubblesort()
{
int i, j;
student s;

for (i = 0; i < count - 1; ++i)
{
for (j = count - 1; j > i; --j)
if (ss[j].total > ss[j-1].total)
{
memcpy(&s, &ss[j-1], sizeof(student));
memcpy(&ss[j-1], &ss[j], sizeof(student));
memcpy(&ss[j], &s, sizeof(student));
}
}
}

void outputrecords()
{
int i;
printf("No:\tName:\t\tTotal:\tChinese:\tMath:\tEnglish:\n");

for (i = 0; i < count; ++i)
{
printf("%d\t%s\t\t%d\t%d\t\t%d\t%d\n",
ss[i].number, ss[i].name, ss[i].total, ss[i].chinese, ss[i].math, ss[i].english);
}
}

void sortrecords()
{
int i = 0;
FILE *fp;
char choice;

fp = fopen(FILE3, "r+");

if (!fp)
{
printf("can't open file\n");
exit(-1);
}

while (1)
{
fscanf(fp, "%s %d %d %d %d", ss[i].name, &ss[i].number,
&ss[i].chinese, &ss[i].math, &ss[i].english);

if (i == count)
break;

ss[i].total = ss[i].chinese + ss[i].math + ss[i].english;
++i;
}

rewind(fp);
puts("Please select the sort method:");
puts("1. Bubble Sort");
puts("2. Selection Sort");
choice = getchar();

if (choice == '1')
bubblesort();
else
selectsort();

rewind(fp);
fclose(fp);
}
int binsearch(const char *name)
{
int low = 0;
int high = count - 1;

while (low <= high)
{
int mid = (low + high) / 2;

if (!strcmp(ss[mid].name, name))
{
return mid;
}
else
{
if (strcmp(ss[mid].name, name) > 0)
high = mid - 1;
else
low = mid + 1;
}
}

return -1;
}

int seqsearch(const char *name)
{
int i;

for (i = 0; i < count; ++i)
{
if (!strcmp(ss[i].name, name))
return i;
}
return -1;
}

void findrecord()
{
char nm[20], choice;
int i;

putchar('\n');
selectsort(1);
while (1)
{
printf("Please input the student name you want to find(!=end):\n");
scanf("%s", nm);

if (nm[0] == '!')
break;

puts("Please select the search method:");
puts("1. binary Search");
puts("2. Sequence Search");
choice = getchar();
getchar();

if (choice == '1')
i = binsearch(nm);
else
i = seqsearch(nm);

if (i != -1)
printf("No: %d Name: %s Total: %d Chinese: %d Math: %d English %d\n",
ss[i].number, ss[i].name, ss[i].total, ss[i].chinese, ss[i].math, ss[i].english);
else
printf("Not Found\n");
}
}

void main()
{
combine2files();
ss = (student *)malloc(sizeof(student) * count);
check4makeup();
sortrecords();
outputrecords();
findrecord();
free(ss);
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