实验七

task4.c

 1 #include <stdio.h>
 2 int hangshu();
 3 int zifushu();
 4 int main() {
 5     printf("data4.txt统计结果:\n");
 6     printf("行数：%d\n",hangshu());
 7     printf("字符数(不包括空格):%d\n",zifushu());
 8     return 0;
 9     }
10 int hangshu() {
11     FILE *fp;
12     fp = fopen("C:/Users/金天/Desktop/vscode/实验7数据文件及部分代码/data4.txt","r");
13     if(!fp) {
14         printf("文件打开失败！\n");
15         return 0;
16     }
17     int count = 0;
18     char ch;
19     while ((ch = getc(fp))!= EOF) {
20         if (ch == '\n') {
21             count++;
22         }
23     }
24     fclose(fp);
25     return count+=1;
26 }
27 int zifushu() {
28     FILE *fp;
29     fp = fopen("C:/Users/金天/Desktop/vscode/实验7数据文件及部分代码/data4.txt","r");
30     if(!fp) {
31         printf("文件打开失败！\n");
32         return 0;
33     }
34     int count = 0;
35     char ch;
36     while ((ch = getc(fp))!= EOF) {
37         if (ch!=' '&&ch!='\n') {
38             count++;
39         }
40     }
41     fclose(fp);
42     return count;
43 }

 task5.c

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

 task7.c

 1 #include <stdio.h>
 2 #include <time.h>
 3 #include <stdlib.h>
 4 
 5 struct student {
 6     long long xuehao;
 7     char name[12];
 8     char banji[24];
 9 };
10 
11 int main() {
12     FILE* fp;
13     struct student STU[80];
14     int total_students = 0;
15     fp = fopen("list.txt", "r");
16     if (fp == NULL) {
17         printf("文件打开失败！");
18         return 0;
19     }
20     while (total_students < 80 && fscanf(fp, "%lld %s %s", &STU[total_students].xuehao, STU[total_students].name, STU[total_students].banji) != EOF) {
21         total_students++;
22     }
23     fclose(fp);
24 
25     srand(time(NULL));
26     int num[5];
27     int count = 0;
28     struct student chu[5];
29     while (count < 5) {
30         int temp = rand() % total_students;
31         int flag = 0;
32         for (int i = 0; i < count; i++) {
33             if (temp == num[i]) {
34                 flag = 1;
35                 break;
36             }
37         }
38         if (flag == 0) {
39             num[count] = temp;
40             chu[count] = STU[temp];
41             count++;
42         }
43     }
44 
45     printf("抽取的学生信息如下：\n");
46     for (int i = 0; i < 5; i++) {
47         printf("%lld %s %s\n", chu[i].xuehao, chu[i].name, chu[i].banji);
48     }
49 
50     char filename[100];
51     printf("请输入文件名：");
52     scanf("%99s", filename); 
53     fp = fopen(filename, "w");
54     if (fp == NULL) {
55         printf("文件打开失败！");
56         return 0;
57     }
58     for (int i = 0; i < 5; i++) {
59         fprintf(fp, "%lld %s %s\n", chu[i].xuehao, chu[i].name, chu[i].banji);
60     }
61     fclose(fp);
62     return 0;
63 }