实验7

实验任务4

 1 #define  _CRT_SECURE_NO_WARNINGS
 2 #include <stdio.h>
 3 int main() {
 4     FILE* fp;
 5     fp = fopen("data4.txt", "r");
 6     if (!fp) {
 7         printf("fail to open\n");
 8         return;
 9     }
10     int line = 1;
11     int count = 0;
12     int a;
13     while ((a = fgetc(fp)) != EOF) {
14         if (a == '\n')
15             line++;
16         else if (a != ' ' && a != '\t')
17             count++;
18     }
19     fclose(fp);
20     printf("data4.txt统计结果:\n");
21     printf("行数:%d\n", line);
22     printf("字符数:%d\n", count);
23     return 0;
24 }
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屏幕截图 2025-12-25 200557

实验任务5

  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     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     fclose(fin);
 68 }
 69 
 70 // 把通过考试的考生完整信息写入文件list_pass.txt
 71 // 准考证号,姓名,客观题得分,操作题得分,总分,结果
 72 void write(STU s[], int n) {
 73     FILE* fout;
 74     fout = fopen("list_pass.txt", "w");
 75     if (!fout) {
 76         printf("fail to open file\n");
 77         return;
 78     }
 79     for (int i = 0; i < n; ++i) {
 80         fprintf(fout, "%ld %s %.2f %.2f %.2f %s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);
 81     }
 82     fclose(fout);
 83 }
 84 
 85 // 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
 86 int process(STU st[], int n, STU st_pass[]) {
 87     int count = 0;
 88     for (int i = 0; i < n; ++i) {
 89         st[i].sum = st[i].objective + st[i].subjective;
 90         if (st[i].sum >= 60)
 91         {
 92             strcpy(st[i].result, "通过");
 93             st_pass[count++] = st[i];
 94         }
 95         else
 96             strcpy(st[i].result, "不通过");
 97 
 98     }
 99     return count;
100 }
View Code

屏幕截图 2025-12-25 194416

实验任务6

 1 #define  _CRT_SECURE_NO_WARNINGS
 2 #include <stdio.h>
 3 #include<stdlib.h>
 4 #include<time.h>
 5 #include<string.h>
 6 #define N 100
 7 int main() {
 8 
 9     char s[N][N];
10     char win[N][N];
11     FILE *fp,*fout;
12     int n,j=0;
13     int x;
14     int a[N] = { 0 };
15     char filename[N];
16     
17     fp = fopen("list.txt", "r");
18     if (!fp) {
19         perror("list.txt");
20         return 1;
21     }
22     while ((fgets(s[j], N, fp)) != NULL)
23         j++;
24     n = j;
25     srand(time(NULL));
26     for (int i = 0; i < 5; ) {
27         int id = rand() % n;
28         if (!a[id])
29         {
30             strcpy(win[i], s[id]);
31             a[id] = 1;
32             i++;
33         }
34     }
35     for (int i = 0; i < 5; i++)
36     {
37         printf("%s\n", win[i]);
38     }
39     printf("enter filename:");
40     gets(filename);
41     fout = fopen(filename, "w");
42     if (!fout) {
43         printf("fail to open\n");
44     }
45     for (int i = 0; i < 5; ++i) {
46         fprintf(fout, "%s\n", win[i]);
47     }
48     fclose(fp);
49     return 0;
50 }
View Code

屏幕截图 2025-12-25 192250

 

posted @ 2025-12-25 20:14  mjy66  阅读(4)  评论(0)    收藏  举报