实验六

 1 #include <stdio.h> 
 2 int main()
 3 {
 4     FILE* fp;
 5     int count=0;
 6     char ch;
 7     fp=fopen("date4.txt","r");    
 8     if(fp==NULL)
 9     {
10         printf("fail to open the file");
11         return 1;
12     }
13     while((ch=fgetc(fp))!=EOF)
14     {
15         if(ch!=' '&&ch!='\n'&&ch!='\t')
16         count++;
17     }
18     fclose(fp);
19     printf("date4.txt中共包含字符数（不计空白符）：%d", count);
20     return 0;
21 }

 1 #define _CRT_SECURE_NO_WARNINGS
 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 
23     printf("\n对考生信息进行处理: 计算总分，确定等级\n");
24     process(stu, N);
25 
26     printf("\n打印考生完整信息, 并保存到文件中");
27     output(stu, N);
28     return 0;
29 }
30 // 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
31 void input(STU s[], int n) {
32     int i;
33     FILE* fin;
34     fin = fopen("examinee.txt", "r");
35     if (fin == NULL) {
36         printf("fail to open file\n");
37         exit(0);
38     }
39     while (!feof(fin)) {
40         for (i = 0; i < n; i++)
41             fscanf(fin, "%ld %s %f %f", &s[i].id, s[i].name,
42                 &s[i].objective, &s[i].subjective);
43     }
44     fclose(fin);
45 }
46 // 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
47 // 不仅输出到屏幕上，还写到文本文件result.txt中
48 void output(STU s[], int n) {
49     FILE* fout;
50     int i;
51     // 输出到屏幕
52     printf("\n");
53     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");
54     for (i = 0; i < n; i++)
55         printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id,
56             s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].level);
57     // 保存到文件
58     fout = fopen("result.txt", "w");
59     if (!fout) {
60         printf("fail to open or create result.txt\n");
61         exit(0);
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 
65     for (i = 0; i < n; i++)
66         fprintf(fout, "%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id,
67             s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].level);
68     fclose(fout);
69 }
70 // 对考生信息进行处理：计算总分，排序，确定等级
71 void process(STU s[], int n) {
72     int i, j;
73     STU t;
74     for (i = 0; i < n; i++)
75         s[i].sum = s[i].objective + s[i].subjective;
76 
77     for (i = 0; i < n - 1; i++)
78         for (j = 0; j < n - 1 - i; j++)
79             if (s[j].sum < s[j + 1].sum)
80             {
81                 t = s[j];
82                 s[j] = s[j + 1];
83                 s[j + 1] = t;
84             }
85 
86     for (i = 0; i < 0.1 * n; i++)
87         strcpy(s[i].level, "优秀");
88     for (; i < 0.5 * n; i++)
89         strcpy(s[i].level, "合格");
90     for (; i < n; i++)
91         strcpy(s[i].level, "不合格");
92 
93 }

 1 #define _CRT_SECURE_NO_WARNINGS
 2 #include <stdio.h>
 3 #include <string.h>
 4 #include <stdlib.h>
 5 #include<time.h>
 6 #define N 80
 7 #define M 5
 8 typedef struct {
 9     long int id;
10     char name[20];
11     char class[30];
12 } STU;
13 // 函数声明
14 void input(STU s[], int n);
15 void output(STU t[], int m);
16 int main() {
17     STU stu[N];
18     input( stu, N);
19     int number, i, j = 0;
20     STU lck[M];
21     srand(time(0));
22     for (i = 0; i < M; i++) {
23         number = rand() % 80;
24         lck[j] = stu[number];
25         j++;
26     }
27     output(lck, M);
28     return 0;
29 }
30 
31 void input(STU s[], int n) {
32     FILE* fp;
33     int i, j;
34     fp = fopen("list.txt", "r");
35     if (fp == NULL)
36     {
37         printf("fail to open file\n");
38         exit(0);
39     }
40     for (i = 0; i < n; i++)
41         fscanf(fp, "%ld %s %s", &s[i].id, s[i].name, s[i].class);
42     fclose(fp);
43 }
44 
45 void output(STU t[], int m) 
46 {
47     int i, j = 0;
48     for (i = 0; i < m; i++)
49         printf("%ld\t%s\t%s\n", t[i].id, t[i].name, t[i].class);
50     FILE* fout;
51     fout = fopen("lucky.txt", "w");
52     if (fout == NULL)
53     {
54         printf("fail to open or create result.txt\n");
55         exit(0);
56     }
57     for (i = 0; i < m; i++)
58         fprintf(fout,"%ld\t\t%s\t%s\n", t[i].id, t[i].name, t[i].class);
59     fclose(fout);
60 
61 }