实验七

task4.c

 1 #include<stdio.h>
 2 
 3 int main(){
 4     FILE *fp;
 5 
 6     int k = 0;
 7     char ch;
 8 
 9     fp = fopen("data4.txt","r");
10 
11     if(fp == NULL) {
12         printf("fail to open file\n");
13         return 1;
14     }
15 
16     while(1){
17     ch = fgetc(fp);
18 
19     if(ch == EOF)
20     break;
21 
22     if(ch != ' '&&ch !='\n'&&ch != '\r')
23     k++;
24 
25     }
26 
27     printf("data4.txt中共包含字符数:%d",k);
28 
29     fclose(fp);
30 
31     return 0;
32 }

task5.c

  1 #include <stdio.h>
  2 #include <string.h>
  3 #include <stdlib.h>
  4 
  5 #define N 10
  6 
  7 typedef struct {
  8     long int id;
  9     char name[20];
 10     float objective;    // 客观题得分
 11     float subjective;   // 操作题得分
 12     float sum;          // 总分
 13     char ans[10];       // 考试结果
 14 } STU;
 15 
 16 // 函数声明
 17 void finput(STU st[], int n);
 18 void foutput(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     finput(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);      // 输出到屏幕
 35     foutput(stu, N);    // 输出到文件
 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 // 把通过考试的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].ans);
 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 finput(STU st[], int n) {
 55     int i;
 56     FILE *fin;
 57 
 58     fin = fopen("examinee.txt", "r");
 59     if (fin == NULL) {
 60         printf("fail to open file\n");
 61         exit(0);
 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 foutput(STU s[], int n) {
 75     FILE *fout;
 76     int i;
 77 
 78     // 保存到文件
 79     fout = fopen("list_pass.txt", "w");
 80     if (!fout) {
 81         printf("fail to open or create list_pass.txt\n");
 82         exit(0);
 83     }
 84 
 85     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结果\n");
 86 
 87     for (i = 0; i < n; i++)
 88         fprintf(fout, "%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].ans);
 89 
 90     fclose(fout);
 91 }
 92 
 93 
 94 
 95 // 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
 96 int process(STU st[], int n, STU st_pass[]) {
 97     // 待补足
 98     // ×××
 99 
100     FILE *fp;
101     int i, k = 0;
102 
103     fp = fopen("examinee.txt", "r");
104     if (!fp) {
105         printf("fail to open or create list_pass.txt\n");
106         exit(0);
107     }
108 
109     for(i = 0;i < n;i++){
110         fscanf(fp,"%ld%s%f%f",&st[i].id,st[i].name,&st[i].objective,&st[i].subjective);
111         st[i].sum = st[i].objective + st[i].subjective;
112 
113         if(st[i].sum >= 60){
114             st_pass[k] = st[i];
115             k++;
116             strcpy(st[i].ans,"pass");
117         }
118         else
119         strcpy(st[i].ans,"fail");
120     }
121 
122     fclose(fp);
123 
124     return k;
125 
126 }

task6.c

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <string.h>
 4 #define N 80
 5 
 6 typedef struct {
 7     int id;
 8     char name[20];
 9     char class[100];
10 }info;
11 
12 
13 void finput(info stu[], int n) {
14 
15     FILE* fp;
16     fp = fopen("list.txt", "r");
17     while (!feof(fp)) {
18         for (int i = 0; i < N; i++) {
19             fscanf(fp, "%d%s%s", &stu[i].id, stu[i].name, stu[i].class);
20         }
21     }
22     fclose(fp);
23 }
24 
25 void output(info stu[], int n) {
26     for (int i = 0; i < n; i++)
27         printf("%d\t%s\t%s\n", stu[i].id, stu[i].name, stu[i].class);
28 }
29 
30 void translate(info stu[], info sts[], int n) {
31     srand((unsigned)time(NULL));
32     int judge[80] = { 0 };
33     for (int i = 0; i < 5; i++) {
34         int j = rand() % 80 + 1;
35         if (judge[j] == 1) {
36             i--;
37             continue;
38         }
39         sts[i].id = stu[j].id;
40         strcpy(sts[i].name, stu[j].name);
41         strcpy(sts[i].class, stu[j].class);
42         judge[j] = 1;
43     }
44 }
45 
46 void sort(info sts[], int n) {
47     for (int i = 0; i < 5; i++) {
48         for (int j = i; j < 5; j++) {
49             if (sts[i].id > sts[j].id) {
50                 int l = sts[i].id;
51                 sts[i].id = sts[j].id;
52                 sts[j].id = l;
53                 char p[100];
54                 strcpy(p, sts[i].name);
55                 strcpy(sts[i].name, sts[j].name);
56                 strcpy(sts[j].name, p);
57             }
58         }
59     }
60 }
61 
62 int main()
63 {
64     info stu[N], sts[5];
65     finput(stu, N);
66     output(stu, N);
67     printf("\n");
68     translate(stu, sts, N);
69     sort(sts, 5);
70     output(sts, 5);
71 
72     return 0;
73 }