实验7

任务4

代码

 1 #include <stdio.h>
 2 #include <ctype.h>
 3 
 4 int main() {
 5     FILE *file;
 6     int count = 0;
 7     int ch;
 8 
 9     file = fopen("data4.txt", "r");
10     if (file == NULL) {
11         printf("Could not open file.\n");
12         return 1;
13     }
14 
15     while ((ch = fgetc(file)) != EOF) {
16         if (!isspace(ch)) {
17             ++count;
18         }
19     }
20 
21     fclose(file);
22     printf("data4.txt中共包含字符数(不计空白符): %d\n", count);
23     return 0;
24 }

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任务5

代码

  1 #include <stdio.h>
  2 #include <string.h>
  3 #include <stdlib.h>
  4 
  5 #define N 10
  6 
  7 typedef struct {
  8     long int id;
  9     char name[20];
 10     float objective;    // 客观题得分
 11     float subjective;   // 操作题得分
 12     float sum;          // 总分
 13     char ans[10];       // 考试结果
 14 } STU;
 15 
 16 // 函数声明
 17 void finput(STU st[], int n);
 18 void foutput(STU st[], int n);
 19 void output(STU st[], int n);
 20 int process(STU st[], int n, STU st_pass[]);
 21 
 22 int main() {
 23     STU stu[N], stu_pass[N];
 24     int cnt;
 25     double pass_rate;
 26 
 27     printf("从文件读入%d个考生信息...\n", N);
 28     finput(stu, N);
 29 
 30     printf("\n对考生成绩进行统计...\n");
 31     cnt = process(stu, N, stu_pass);
 32 
 33     printf("\n通过考试的名单:\n");
 34     output(stu, N);      // 输出到屏幕
 35     foutput(stu, N);    // 输出到文件
 36 
 37     pass_rate = 1.0 * cnt / N;
 38     printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100);
 39 
 40     return 0;
 41 }
 42 
 43 // 把通过考试的考生完整信息输出到屏幕上
 44 // 准考证号，姓名，客观题得分，操作题得分，总分，结果
 45 void output(STU st[], int n) {
 46     int i;
 47     
 48     printf("准考证号\t姓名\t客观题得分\t操作题得分\t总分\t\t结果\n");
 49     for (i = 0; i < n; i++)
 50         printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].ans);
 51 }
 52 
 53 // 从文本文件examinee.txt读入考生信息:准考证号，姓名，客观题得分，操作题得分
 54 void finput(STU st[], int n) {
 55     int i;
 56     FILE *fin;
 57 
 58     fin = fopen("examinee.txt", "r");
 59     if (fin == NULL) {
 60         printf("fail to open file\n");
 61         exit(0);
 62     }
 63 
 64     while (!feof(fin)) {
 65         for (i = 0; i < n; i++)
 66             fscanf(fin, "%ld %s %f %f", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective);
 67     }
 68 
 69     fclose(fin);
 70 }
 71 
 72 // 把通过考试的考生完整信息写入文件list_pass.txt
 73 // 准考证号，姓名，客观题得分，操作题得分，总分，结果
 74 void foutput(STU s[], int n) {
 75     FILE *fout;
 76     int i;
 77     
 78     // 保存到文件 
 79     fout = fopen("list_pass.txt", "w");
 80     if (!fout) {
 81         printf("fail to open or create list_pass.txt\n");
 82         exit(0);
 83     }
 84     
 85     fprintf(fout, "准考证号\t\t姓名\t客观题得分\t操作题得分\t总分\t\t结果\n");
 86 
 87     for (i = 0; i < n; i++)
 88         fprintf(fout, "%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].ans);
 89 
 90     fclose(fout);
 91 }
 92 
 93 
 94 
 95 // 对考生信息进行处理：计算每位考生考试总分、结果；统计考试通过的人数
 96 int process(STU st[], int n, STU st_pass[]) {
 97     int pass_count = 0;
 98     int i;
 99     for (i = 0; i < n; i++) {
100         // 计算总分
101         st[i].sum = st[i].objective + st[i].subjective;
102 
103         // 判断考试结果
104         if (st[i].sum >= 60) {
105             strcpy(st[i].ans, "通过");
106             // 复制通过的考生信息到st_pass数组
107             st_pass[pass_count] = st[i];
108             pass_count++;
109         } else {
110             strcpy(st[i].ans, "未通过");
111         }
112     }
113     return pass_count;
114 }

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任务6

代码1

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <string.h>
 4 #include <time.h>
 5 
 6 #define MAX_STUDENTS 80
 7 #define LUCKY_COUNT 5
 8 
 9 // 读取学生名单
10 void readStudents(char students[MAX_STUDENTS][50], int *count) {
11     FILE *file = fopen("list.txt", "r");
12     if (!file) {
13         printf("无法打开文件 list.txt\n");
14         exit(1);
15     }
16 
17     while (!feof(file) && *count < MAX_STUDENTS) {
18         fgets(students[*count], 50, file);
19         // 去除换行符
20         students[*count][strcspn(students[*count], "\n")] = 0;
21         (*count)++;
22     }
23 
24     fclose(file);
25 }
26 
27 // 随机抽取学生并写入文件
28 void pickLuckyStudents(char students[MAX_STUDENTS][50], int count) {
29     FILE *file = fopen("lucky.txt", "w");
30     if (!file) {
31         printf("无法创建文件 lucky.txt\n");
32         exit(1);
33     }
34 
35     printf("幸运学生名单：\n");
36     for (int i = 0; i < LUCKY_COUNT; i++) {
37         int randomIndex = rand() % count;
38         printf("%s\n", students[randomIndex]);
39         fprintf(file, "%s\n", students[randomIndex]);
40     }
41 
42     fclose(file);
43 }
44 
45 int main() {
46     char students[MAX_STUDENTS][50];
47     int count = 0;
48 
49     srand((unsigned int)time(NULL)); // 初始化随机数发生器
50     readStudents(students, &count);
51     pickLuckyStudents(students, count);
52 
53     return 0;
54 }

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代码2、

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <string.h>
 4 #include <time.h>
 5 
 6 #define MAX_STUDENTS 80
 7 #define LUCKY_COUNT 5
 8 
 9 typedef struct {
10     long id;         // 学号
11     char name[50];   // 姓名
12     char class[50];  // 班级
13 } Student;
14 
15 // 读取学生名单
16 int readStudents(Student students[MAX_STUDENTS]) {
17     FILE *file = fopen("list.txt", "r");
18     int count = 0;
19     if (!file) {
20         printf("无法打开文件 list.txt\n");
21         exit(1);
22     }
23 
24     while (fscanf(file, "%ld %s %[^\n]", &students[count].id, students[count].name, students[count].class) != EOF && count < MAX_STUDENTS) {
25         count++;
26     }
27 
28     fclose(file);
29     return count;
30 }
31 
32 // 比较两个学生（用于排序）
33 int compareStudents(const void *s1, const void *s2) {
34     Student *student1 = (Student *)s1;
35     Student *student2 = (Student *)s2;
36     return (int)(student1->id - student2->id);
37 }
38 
39 // 随机抽取学生并写入文件
40 void pickLuckyStudents(Student students[MAX_STUDENTS], int count) {
41     Student luckyStudents[LUCKY_COUNT];
42     int chosenIndices[MAX_STUDENTS] = {0};
43     int i; 
44     for (i = 0; i < LUCKY_COUNT; i++) {
45         int randomIndex;
46         do {
47             randomIndex = rand() % count;
48         } while (chosenIndices[randomIndex]);
49 
50         chosenIndices[randomIndex] = 1;
51         luckyStudents[i] = students[randomIndex];
52     }
53 
54     // 按学号排序
55     qsort(luckyStudents, LUCKY_COUNT, sizeof(Student), compareStudents);
56 
57     // 获取当前日期
58     char fileName[20];
59     time_t now = time(NULL);
60     struct tm *t = localtime(&now);
61     sprintf(fileName, "%04d%02d%02d.txt", t->tm_year + 1900, t->tm_mon + 1, t->tm_mday);
62 
63     FILE *file = fopen(fileName, "w");
64     if (!file) {
65         printf("无法创建文件 %s\n", fileName);
66         exit(1);
67     }
68 
69     printf("幸运学生名单：\n");
70     for ( i = 0; i < LUCKY_COUNT; i++) {
71         printf("%ld %s %s\n", luckyStudents[i].id, luckyStudents[i].name, luckyStudents[i].class);
72         fprintf(file, "%ld %s %s\n", luckyStudents[i].id, luckyStudents[i].name, luckyStudents[i].class);
73     }
74 
75     fclose(file);
76 }
77 
78 int main() {
79     Student students[MAX_STUDENTS];
80     srand((unsigned int)time(NULL)); // 初始化随机数发生器
81 
82     int count = readStudents(students);
83     if (count > 0) {
84         pickLuckyStudents(students, count);
85     } else {
86         printf("未读取到任何学生信息。\n");
87     }
88 
89     return 0;
90 }

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posted @ 2023-12-19 23:55 starming 阅读(10) 评论(0) 编辑收藏举报

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