实验7

任务4

代码:

 1 #define _CRT_SECURE_NO_WARNINGS
 2 #include <stdio.h>
 3 
 4 
 5 #define N 3
 6 
 7 void write();
 8 void count();
 9 
10 int main() {
11     printf("测试1: 把数据写入文本文件\n");
12     write();
13 
14     printf("\n测试2: 统计文件的行数和非空白字符数\n");
15     count();
16 
17     return 0;
18 }
19 
20 void write() {
21     const char* lines[N] = {
22         "0123456789-0123456789",
23         "nuist2025",
24         "cosmos  galaxy"
25     };
26     FILE* fp = fopen("data4.txt", "w");
27     if (!fp) {
28         printf("fail to open file to write\n");
29         return;
30     }
31     for (int i = 0; i < N; ++i) {
32         fputs(lines[i], fp);
33         fputs("\n", fp);
34     }
35     fclose(fp);
36 }
37 
38 int is_whitespace(int ch) {
39     return ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r';
40 }
41 
42 void count() {
43     FILE* fp = fopen("data4.txt", "r");
44     if (!fp) {
45         printf("fail to open file to read\n");
46         return;
47     }
48     int ch, lines = 0, chars = 0;
49     while ((ch = fgetc(fp)) != EOF) {
50         if (ch == '\n')
51             lines++;
52         if (!is_whitespace(ch))
53             chars++;
54     }
55     fseek(fp, -1, SEEK_END);
56     if (ftell(fp) >= 0) {
57         ch = fgetc(fp);
58         if (ch != '\n')
59             lines++;
60     }
61     fclose(fp);
62     printf("行数: %d\n", lines);
63     printf("非空白字符数: %d\n", chars);
64 }
View Code

运行结果:

任务5

代码:

  1 #define _CRT_SECURE_NO_WARNINGS 1
  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     FILE* fp = fopen("examinee.txt", "w");
 24     if (!fp) {
 25         printf("fail to open file\n");
 26         return 1;
 27     }
 28     fprintf(fp, "1001\t桃乐丝\t36\t55\n");
 29     fprintf(fp, "1002\t稻草人\t28\t40\n");
 30     fprintf(fp, "1003\t千寻\t39\t55\n");
 31     fprintf(fp, "1004\t白龙\t35\t60\n");
 32     fprintf(fp, "1005\t汤婆婆\t20\t35\n");
 33     fprintf(fp, "1006\t无脸男\t33\t50\n");
 34     fprintf(fp, "1007\t希达\t40\t32\n");
 35     fprintf(fp, "1008\t巴鲁\t28\t30\n");
 36     fprintf(fp, "1009\t苏菲\t37\t60\n");
 37     fprintf(fp, "1010\t哈尔\t35\t57\n");
 38     fclose(fp);
 39     printf("examinee.txt 文件已生成!\n");
 40 
 41     STU stu[N], stu_pass[N];
 42     int cnt;
 43     double pass_rate;
 44 
 45     printf("从文件读入%d个考生信息...\n", N);
 46     read(stu, N);
 47 
 48     printf("\n对考生成绩进行统计...\n");
 49     cnt = process(stu, N, stu_pass);
 50 
 51     printf("\n通过考试的名单:\n");
 52     output(stu, N);   // 输出所有考生完整信息到屏幕
 53     write(stu, N);    // 输出考试通过的考生信息到文件
 54 
 55     pass_rate = 1.0 * cnt / N;
 56     printf("\n本次等级考试通过率: %.2f%%\n", pass_rate * 100);
 57 
 58     return 0;
 59 }
 60 
 61 // 把所有考生完整信息输出到屏幕上
 62 // 准考证号,姓名,客观题得分,操作题得分,总分,结果
 63 void output(STU st[], int n) {
 64     int i;
 65 
 66     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");
 67     for (i = 0; i < n; i++)
 68         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);
 69 }
 70 
 71 // 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
 72 void read(STU st[], int n) {
 73     int i;
 74     FILE* fin;
 75 
 76     fin = fopen("examinee.txt", "r");
 77     if (!fin) {
 78         printf("fail to open file\n");
 79         return;
 80     }
 81 
 82     while (!feof(fin)) {
 83         for (i = 0; i < n; i++)
 84             fscanf(fin, "%ld %s %f %f", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective);
 85     }
 86 
 87     fclose(fin);
 88 }
 89 
 90 // 把通过考试的考生完整信息写入文件list_pass.txt
 91 // 准考证号,姓名,客观题得分,操作题得分,总分,结果
 92 void write(STU s[], int n) {
 93     int i;
 94     FILE* fp;
 95     fp = fopen("list_pass.txt", "w");
 96     fprintf(fp, "%-10s %-8s %-10s %-10s %-10s %-8s\n", "准考证号", "姓名", "客观题得分", "操作题得分", "总分", "结果");
 97     for (i = 0; i < n; i++) {
 98         if (s[i].sum >= 60)
 99             fprintf(fp, "%-10ld %-8s %-10.2f %-10.2f %-10.2f %-8s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);
100     }
101     fclose(fp);
102 }
103 
104 // 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
105 int process(STU st[], int n, STU st_pass[]) {
106     int i, j;
107     for (i = 0; i < n; ++i) {
108         st[i].sum = st[i].objective + st[i].subjective;
109     }
110     for (i = 0, j = 0; i < n; ++i) {
111         if (st[i].sum >= 60) {
112             strcpy(st[i].result, "通过");
113             st_pass[j] = st[i];
114             j++;
115         }
116         else {
117             strcpy(st[i].result, "不通过");
118         }
119     }
120     return j;
121 }
View Code

运行结果:

 

任务6

代码:

 1 #include<stdio.h>
 2 #include<string.h>
 3 #include<time.h>
 4 #include<stdlib.h>
 5 
 6 #define N 5
 7 #define M 80
 8 
 9 struct student
10 {
11     char id[10];
12     char name[10];
13     char num_class[30];
14 }STU;
15 
16 int main()
17 {
18     struct student x[M], y[N];
19     char name_file[50];
20     char filePath[200];
21     int i=0,j=0, k,number;
22     FILE *fp;
23     srand(time(NULL));
24 
25     printf("------------------20250525中奖名单-------------------\n");
26 
27     fp = fopen("E:\\学科资料(整理)\\大一下\\C语言实验\\实验7数据文件及部分代码\\实验7数据文件及部分代码\\list.txt","r");
28 
29     if(!fp)
30     {
31         printf("fail to open file to read\n");
32         return 0;
33     }
34     
35      while(!feof(fp)) 
36      {
37         number = fscanf(fp, "%s%s%s", x[i].id, x[i].name,x[i].num_class);
38         if(number != 3)
39             break;
40         i++;
41     }
42      fclose(fp);
43     
44 
45     while(j<5)
46     {
47         k=rand()%79;
48         y[j++]=x[k];
49         printf("%-10s%-10s%-30s\n", x[k].id, x[k].name, x[k].num_class);
50     }
51 
52     printf("输入保存文件名:");
53     scanf("%s",name_file);
54     sprintf(filePath, "E:\\学科资料(整理)\\大一下\\C语言实验\\实验7数据文件及部分代码\\实验7数据文件及部分代码\\%s.txt", name_file);
55 
56     fp=fopen(filePath,"w");
57     
58     if(fp==NULL)
59     {
60         printf("fail to open file to write\n");
61         return 0;
62     }
63 
64     for(j=0;j<N;++j)
65     {
66         fprintf(fp,"%-10s%-10s%-30s\n",y[j].id, y[j].name,y[j].num_class);
67     }
68     fclose(fp);
69 
70     system("pausse");
71     return 0;
72 }
View Code

运行结果:

 

posted @ 2025-06-08 23:10  吉筱嘉  阅读(23)  评论(0)    收藏  举报