实验文档7

关于第7次实验课作业

实验结论

task4.c

 1 #define _CRT_SECURE_NO_WARNINGS
 2 #include<stdio.h>
 3 #define N 10000
 4 int main() {
 5     char ch[N];
 6     int line = 1;
 7     int n = 0;
 8     int j = 0;
 9     FILE* fp;
10     fp = fopen("data4.txt", "r");
11     if (!fp) {
12         printf("fail to open the file to read\n");
13         return 0;
14     }
15     int i = 0;
16     while (!feof(fp)) {
17         ch[i] = fgetc(fp);
18         if (ch[i] == '\n') {
19             line++;
20         }
21         if (ch[i] == EOF) {
22             break;
23         }
24         if (ch[i] == '\n' || ch[i] == ' ' || ch[i] == '    ') {
25             j++;
26         }
27         i++;
28     }
29     n = i - j;
30     fclose(fp);
31     printf("data4.txt统计结果:\n");
32     printf("%-20s%-20d\n", "行数", line);
33     printf("%-20s%-20d", "字符数(不计空白符)", n);
34     return 0;
35 }

task5.c

  1 #define _CRT_SECURE_NO_WARNINGS
  2 #include <stdio.h>
  3 #include <string.h>
  4 
  5 #define N 10
  6 
  7 typedef struct {
  8     long id;            // 准考证号
  9     char name[20];      // 姓名
 10     float objective;    // 客观题得分
 11     float subjective;   // 操作题得分
 12     float sum;          // 总分
 13     char result[10];    // 考试结果
 14 } STU;
 15 
 16 // 函数声明
 17 void read(STU st[], int n);
 18 void write(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     read(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);   // 输出所有考生完整信息到屏幕
 35     write(stu, N);    // 输出考试通过的考生信息到文件
 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 // 把所有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].result);
 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 read(STU st[], int n) {
 55     int i;
 56     FILE* fin;
 57 
 58     fin = fopen("examinee.txt", "r");
 59     if (!fin) {
 60         printf("fail to open file\n");
 61         return;
 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 write(STU s[], int n) {
 75     FILE* fout;
 76     fout=fopen("list_pass.txt", "w");
 77     if (!fout) {
 78         printf("fail to open the file to write\n");
 79         return;
 80     }
 81     fprintf(fout, "%-20s %-20s %-20s %-20s %-20s %-20s\n","准考证号","姓名","客观题得分","操作题得分","总分","结果");
 82     for (int i = 0; i < n; i++) {
 83         if (s[i].sum >= 60) {
 84             fprintf(fout, "%-20ld %-20s %-20.2f %-20.2f %-20.2f %-20s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);
 85         }
 86     }
 87     fclose(fout);
 88 }
 89 // 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
 90 int process(STU st[], int n, STU st_pass[]) {
 91     int cnt = 0;
 92     for (int i = 0; i < N; i++) {
 93         st[i].sum = st[i].objective + st[i].subjective;
 94         if (st[i].sum >= 60) {
 95             strcpy(st[i].result, "通过");
 96             st_pass[cnt] = st[i];
 97             cnt++;
 98         }
 99         else {
100             strcpy(st[i].result, "不通过");
101         }
102     }
103     return cnt;
104 }

task6.c

必做

 1 #define _CRT_SECURE_NO_WARNINGS
 2 #include <stdio.h>
 3 #include<stdlib.h>
 4 #include<time.h>
 5 #define N 80
 6 typedef struct {
 7     char num[20];
 8     char name[20];
 9     char class[40];
10 }STU;
11 STU st[N];
12 void read();
13 void func();
14 int main()
15 {
16     read();
17     func();
18     return 0;
19 }
20 void read() {
21     FILE* fin;
22     fin = fopen("list.txt", "r");
23     if (!fin) {
24         printf("fail to open the file to read\n");
25         return;
26     }
27     int number;
28     int i = 0;
29     while (!feof(fin)) {
30         number = fscanf(fin, "%s%s%s", st[i].num, st[i].name, st[i].class);
31         if (number != 3) {
32             break;
33         }
34         i++;
35     }
36 }
37 void func() {
38     srand(time(NULL));
39     int cnt[5] = { 0 };
40     int sign = 1;
41     for (int i = 0; i < 5; i++) {
42         int t = rand() % 80;
43         for (int j = 0; j++; j < 5) {
44             if (cnt[j] == t) {
45                 sign = 0;
46                 break;
47             }
48         }
49         if (sign) {
50             cnt[i] = t;
51         }
52     }
53 
54     FILE* fp;
55     fp = fopen("result.txt", "w");
56     if (!fp) {
57         printf("fail to open the file to write\n");
58         return;
59     }
60     for (int i = 0; i < 5; i++) {
61         printf("%-20s %-20s %-40s\n", st[cnt[i]].num, st[cnt[i]].name, st[cnt[i]].class);
62         fprintf(fp, "%-20s %-20s %-40s\n", st[cnt[i]].num, st[cnt[i]].name, st[cnt[i]].class);
63     }
64 }