实验6 文件应用编程

实验4

程序源码

 1 #define _CRT_SECURE_NO_WARNINGS 1
 2 #include <stdio.h>
 3 
 4 int main() {
 5     FILE* fp;
 6     fp = fopen("data4.txt", "r");
 7     if (fp == NULL) {
 8         printf("fail to open data4\n");
 9     }
10     char ch;
11     int count = 0;
12     ch = fgetc(fp);
13     while (ch != EOF) {
14         if (ch != 32 && ch != '\n') {
15             count++;
16         }
17         ch = fgetc(fp);
18     }
19     fclose(fp);
20     printf("data4 字符个数为：%d", count);
21     
22     return 0;
23 }

程序运行截图

实验任务5

程序源码

 1 #define _CRT_SECURE_NO_WARNINGS 1
 2 #include <stdio.h>
 3 #include <string.h>
 4 #include <stdlib.h>
 5 #define N 10
 6 typedef struct {
 7     long int id;
 8     char name[20];
 9     float objective;// 客观题得分
10     float subjective;// 操作题得分
11     float sum;
12     char level[10];
13 } STU;
14 // 函数声明
15 void input(STU s[], int n);
16 void output(STU s[], int n);
17 void process(STU s[], int n);
18 int main() {
19     STU stu[N];
20     printf("从文件读入%d个考生信息: 准考证号，姓名，客观题得分(<=40)，操作题得分(<= 60)\n", N);
21         input(stu, N);
22     printf("\n对考生信息进行处理: 计算总分，确定等级\n");
23     process(stu, N);
24     printf("\n打印考生完整信息, 并保存到文件中");
25     output(stu, N);
26     return 0;
27 }
28 // 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
29 void input(STU s[], int n) {
30     int i;
31     FILE* fin;
32     fin = fopen("examinee.txt", "r");
33     if (fin == NULL) {
34         printf("fail to open file\n");
35         exit(0);
36     }
37     while (!feof(fin)) {
38         for (i = 0; i < n; i++)
39             fscanf(fin, "%ld %s %f %f", &s[i].id, s[i].name,
40                 &s[i].objective, &s[i].subjective);
41     }
42     fclose(fin);
43 }
44 // 输出考生完整信息: 准考证号，姓名，客观题得分，操作题得分，总分，等级
45 // 不仅输出到屏幕上，还写到文本文件result.txt中
46 void output(STU s[], int n) {
47     FILE* fout;
48     int i;
49 
50     // 输出到屏幕
51     printf("\n");
52     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等级\n");
53     for (i = 0; i < n; i++)
54         printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id,
55             s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].level);
56     // 保存到文件
57     fout = fopen("result.txt", "w");
58     if (!fout) {
59         printf("fail to open or create result.txt\n");
60         exit(0);
61     }
62 
63     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等级\n");
64     for (i = 0; i < n; i++)
65         fprintf(fout, "%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id,
66             s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].level);
67     fclose(fout);
68 }
69 // 对考生信息进行处理：计算总分，排序，确定等级
70 void process(STU s[], int n) {
71     for (int i = 0; i < n; i++) {
72         s[i].sum = s[i].objective * 0.4 + s[i].subjective * 0.6;
73     }
74     for (int i = 0; i < n; i++) {
75         for (int j = 0; j < n - i - 1; j++) {
76             if (s[j].sum < s[j + 1].sum) {
77                 STU temp;
78                 temp = s[j];
79                 s[j] = s[j + 1];
80                 s[j + 1] = temp;
81             }
82         }
83     }
84     int i;
85     for (i = 0; i < 0.1 * n; i++) {
86         strcpy(s[i].level, "优秀");
87     }
88     for (; i < 0.5 * n; i++) {
89         strcpy(s[i].level, "合格");
90     }
91     for (; i < n; i++) {
92         strcpy(s[i].level, "不及格");
93     }
94 }

程序运行截图

实验任务六

程序源码

 1 #define _CRT_SECURE_NO_WARNINGS 1
 2 #include <stdio.h>
 3 #include <stdlib.h>
 4 #include <time.h>
 5 typedef struct STU {
 6     long int id;
 7     char name[20];
 8     char class[50];
 9     int flag;
10 }STU;
11 
12 int main() {
13     //time_t now;
14     //time(&now);
15     /*time_t now;
16     struct tm* tm_now;
17     time(&now);
18     tm_now = localtime(&now);
19     printf("now datetime: %d-%d-%d %d:%d:%d\n", tm_now->tm_year + 1900, tm_now->tm_mon + 1, tm_now->tm_mday, tm_now->tm_hour, tm_now->tm_min, tm_now->tm_sec);
20     */
21 #include <stdio.h>
22 #include <time.h>
23 
24     
25     time_t rawtime;
26     struct tm* info;
27     char buffer[80];
28 
29     time(&rawtime);
30 
31     info = localtime(&rawtime);
32 
33     strftime(buffer, 80, "%Y%m%d %H%M%S.txt", info);
34     
35 
36     
37     srand(time(0));
38     int num = 5;
39 
40     FILE* fin;
41     fin = fopen("list.txt", "r");
42     if (fin == NULL) {
43         printf("fail to open list\n");
44     }
45     STU stu[80];
46     FILE* fout;
47     fout = fopen(buffer, "w");
48     if (fout == NULL) {
49         printf("fail to open lucky\n");
50     }
51     while (num--) {
52         long int seek_id = 204942000 + rand() % 21;
53         for (int i = 0; i < 80; i++) {
54             stu[i].flag = 0;
55             fscanf(fin, "%ld %s %s", &stu[i].id, stu[i].name, stu[i].class);
56             if (stu[i].id == seek_id) {
57                 if (stu[i].flag == 0) {
58                     fprintf(fout, "%d\t%s\t%s\n", stu[i].id, stu[i].name, stu[i].class);
59                     printf("%d\t%s\t%s\n", stu[i].id, stu[i].name, stu[i].class);
60                     stu[i].flag = 1;
61                 }
62                 else
63                     continue;
64             }
65         }
66     
67     }
68     return 0;
69 }

程序运行截图