实验7_文件应用编程

4.task_4

 1 #include <stdio.h>
 2 #include <string.h>
 3 #define N 10000
 4 
 5 int main()
 6 {
 7     int count,i,t=0;
 8     char x[N];
 9     FILE *fp;
10     fp=fopen("D:\\data4.txt","r");
11     while (!feof(fp))
12     {
13         fgets(x,N,fp);
14         count=strlen(x);
15         if (x[count-1]=='\n')
16         {
17             x[count-1]='\0';
18             count--;
19         }
20         for (i=0;x[i]!='\0';i++)
21         {
22             if (x[i]==' ')
23                 count--;
24         }
25         t+=count;
26     }
27     fclose(fp);
28     printf("data4.txt中共包含字符数（不计空白字符）：%d\n",t);
29     return 0;
30 }

5.task_5

  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;
 11     float subjective;
 12     float sum;
 13     char ans[10];
 14 } STU;
 15 
 16 void finput(STU st[], int n);
 17 void foutput(STU st[], int n);
 18 void output(STU st[], int n);
 19 int process(STU st[], int n, STU st_pass[]);
 20 
 21 int main() {
 22     STU stu[N], stu_pass[N];
 23     int cnt;
 24     double pass_rate;
 25 
 26     printf("从文件读入%d个考生信息...\n", N);
 27     finput(stu, N);
 28 
 29     printf("\n对考生成绩进行统计...\n");
 30     cnt = process(stu, N, stu_pass);
 31 
 32     printf("\n通过考试的名单:\n");
 33     output(stu, N);
 34     foutput(stu, N);
 35 
 36     pass_rate = 1.0 * cnt / N;
 37     printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100);
 38 
 39     return 0;
 40 }
 41 
 42 void output(STU st[], int n) {
 43     int i;
 44     
 45     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");
 46     for (i = 0; i < n; i++)
 47         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);
 48 }
 49 
 50 void finput(STU st[], int n) {
 51     int i;
 52     FILE *fin;
 53 
 54     fin = fopen("D:\\examinee.txt", "r");
 55     if (fin == NULL) {
 56         printf("fail to open file\n");
 57         exit(0);
 58     }
 59 
 60     while (!feof(fin)) {
 61         for (i = 0; i < n; i++)
 62             fscanf(fin, "%ld %s %f %f", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective);
 63     }
 64 
 65     fclose(fin);
 66 }
 67 
 68 void foutput(STU s[], int n) {
 69     FILE *fout;
 70     int i;
 71     
 72     fout = fopen("D:\\list_pass.txt", "w");
 73     if (!fout) {
 74         printf("fail to open or create list_pass.txt\n");
 75         exit(0);
 76     }
 77     
 78     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");
 79 
 80     for (i = 0; i < n; i++)
 81         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);
 82 
 83     fclose(fout);
 84 }
 85  
 86 int process(STU st[], int n, STU st_pass[]) {
 87     int i,j;
 88     for (i=0,j=0;i<n;i++)
 89     {
 90         st[i].sum=st[i].objective+st[i].subjective;
 91         if (st[i].sum>=60)
 92         {
 93             strcpy(st[i].ans,"pass");
 94             st_pass[j++]=st[i];
 95         }
 96         else
 97             strcpy(st[i].ans,"fail");
 98     }
 99     return j;
100 }

6.task_6

 1 #include <stdio.h>
 2 #include <string.h>
 3 #include <stdlib.h>
 4 #define N 100
 5 
 6 typedef struct
 7 {
 8     long int id;
 9     char name[N];
10     char class[N];
11 }STU;
12 
13 void finput(STU st[N],int n);
14 void foutput(STU st[N]);
15 
16 int main()
17 {
18     int i,k;
19     STU stu[N],lucky[N];
20     finput(stu,N);
21     for (i=0;i<5;i++)
22     {
23         k=rand()%80;
24         lucky[i]=stu[k];
25     }
26     foutput(lucky);
27     for (i=0;i<5;i++)
28         printf("%ld\t\t%s\t\t%s\n",lucky[i].id,lucky[i].name,lucky[i].class);
29     return 0;
30 }
31 
32 void finput(STU st[N],int n)
33 {
34     int i;
35     FILE *fin;
36 
37     fin = fopen("D:\\list.txt", "r");
38     if (fin == NULL) {
39         printf("fail to open file\n");
40         exit(0);
41     }
42 
43     while (!feof(fin)) {
44         for (i = 0; i < n; i++)
45             fscanf(fin, "%ld %s %s",&st[i].id,st[i].name,st[i].class);
46     }
47 
48     fclose(fin);
49     
50 }
51 
52 void foutput(STU st[N])
53 {
54     int i;
55     FILE *fout;
56     fout = fopen("D:\\lucky.txt", "w");
57     if (!fout) {
58         printf("fail to open or create list_pass.txt\n");
59         exit(0);
60     }
61     for (i=0;i<5;i++)
62         fprintf(fout,"%ld\t\t%s\t\t%s\n",st[i].id,st[i].name,st[i].class);
63     fclose(fout);
64 }