实验7

task4.c

源代码

 1 #include<stdio.h>
 2 
 3 void read_h();
 4 void read_z();
 5 
 6 int main(){
 7     printf("data4.txt统计结果:\n");
 8     printf("行数:");
 9     read_h();
10     printf("字符数(不计算空白符):");
11     read_z();
12     return 0;
13 }
14 
15 
16 
17 void read_h(){
18     FILE *fp;
19     int t=0;
20     char ch;
21 
22     fp=fopen("data4.txt","r");
23     if(!fp) {
24         printf("fail to open file to read\n");
25         return;
26     }
27     while(!feof(fp)) {
28         ch = fgetc(fp);
29         if(ch =='\n'||ch==EOF)
30             t++;
31     }
32     printf("%d\n",t);
33     fclose(fp);
34 }
35 
36 void read_z(){
37     FILE *fp;
38     int t=0;
39     char ch;
40 
41     fp=fopen("data4.txt","r");
42     if(!fp) {
43         printf("fail to open file to read\n");
44         return;
45     }
46     while(!feof(fp)) {
47         ch = fgetc(fp);
48         if(ch != '\n'&&ch!=' '&&ch!='    '&&ch!=EOF)
49             t++;
50     }
51     printf("%d",t);
52     fclose(fp);
53 }

运行结果

task5.c

源代码

 1 ocess(stu, N, stu_pass);
 2 
 3     printf("\n通过考试的名单:\n");
 4     output(stu, N);   // 输出所有考生完整信息到屏幕
 5     write(stu, N);    // 输出考试通过的考生信息到文件
 6 
 7     pass_rate = 1.0 * cnt / N;
 8     printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100);
 9 
10     return 0;
11 }
12 
13 // 把所有考生完整信息输出到屏幕上
14 // 准考证号,姓名,客观题得分,操作题得分,总分,结果
15 void output(STU st[], int n) {
16     int i;
17     
18     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");
19     for (i = 0; i < n; i++)
20         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);
21 }
22 
23 // 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
24 void read(STU st[], int n) {
25     int i;
26     FILE *fin;
27 
28     fin = fopen("examinee.txt", "r");
29     if (!fin) {
30         printf("fail to open file\n");
31         return;
32     }
33 
34     while (!feof(fin)) {
35         for (i = 0; i < n; i++)
36             fscanf(fin, "%ld %s %f %f", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective);
37     }
38 
39     fclose(fin);
40 }
41 
42 // 把通过考试的考生完整信息写入文件list_pass.txt
43 // 准考证号,姓名,客观题得分,操作题得分,总分,结果
44 void write(STU s[], int n) {
45 FILE *fp;
46     int i;
47 
48     fp=fopen("list_pass.txt","w");
49     if(!fp) {
50         printf("fail to open file to write\n");
51         return;
52     }
53     fprintf(fp,"准考证号   姓名   客观题得分   操作题得分   总分     结果\n");
54     for (i = 0; i < N; i++)
55     if(s[i].sum>=60)
56         fprintf(fp,"%-20ld%-10s\t%-20.2f%-20.2f%-20.2f%s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);
57 
58 
59     fclose(fp);
60 }
61 
62 // 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
63 int process(STU st[], int n, STU st_pass[]) {
64  int count=0,i;
65     for(i=0;i<n;i++){
66         st[i].sum=st[i].objective+st[i].subjective;
67         if(st[i].sum>=60){
68             strcpy(st[i].result,"通过");
69             st_pass[count++]=st[i];
70         }
71         else
72             strcpy(st[i].result,"不通过");
73     }
74     return count;
75 }

运行结果

task6.c

源代码

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<time.h>
 4 #define N 80
 5 #define M 5
 6 typedef struct{
 7     long id;
 8     char name[20];
 9     char cname[20];
10     int sign;
11 }stu;
12 
13 void read(stu s[],int n);
14 void choose(stu s[],stu ss[],int n,int m);
15 void save(stu ss[],int m,char fname[]);
16 
17 int main(){
18     stu s[N],ss[M];
19     int i;
20     char fname[50];
21     for(i=0;i<N;i++)
22         s[i].sign=0;
23     printf("------------随机抽点名单-----------\n");
24     read(s,N);
25     choose(s,ss,N,M);
26     for(i=0;i<M;i++)
27         printf("%-16ld%-8s%s\n",ss[i].id,ss[i].name,ss[i].cname);
28     printf("\n------------保存到文件-----------\n");
29     printf("输入文件名:");
30     gets(fname);
31     save(ss,M,fname);
32     printf("保存成功");
33     system("pause");
34     return 0;
35 }
36 
37 void read(stu s[],int n){
38     FILE *fp;
39     int i;
40     if((fp=fopen("list.txt","r"))==NULL){
41         printf("fail to open file\n");
42         return;
43     }
44     for(i=0;i<n;i++)
45         fscanf(fp,"%ld %s %s",&s[i].id,s[i].name,s[i].cname);
46     fclose(fp);
47 }
48 
49 void choose(stu s[],stu ss[],int n,int m){
50     int i,random;
51     srand(time(NULL));
52     for(i=0;i<m;i++){
53         do{
54             random=rand()%80;
55         }while(s[random].sign==1);
56         s[random].sign=1;
57         ss[i]=s[random];
58     }
59 }
60 
61 void save(stu ss[],int m,char fname[]){
62     FILE *fp;
63     int i;
64     if((fp=fopen(fname,"w"))==NULL){
65         printf("fail to open file\n");
66         return;
67     }
68     for(i=0;i<m;i++)
69         fprintf(fp,"%-16ld%-8s%s\n",ss[i].id,ss[i].name,ss[i].cname);
70     fclose(fp);
71 }

运行结果

 

posted @ 2024-12-30 09:34  yuanjialiang  阅读(15)  评论(0)    收藏  举报