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实验七

时间:2023-12-20 17:11:30浏览次数:29  
标签:int printf st STU 实验 pass t%

task.4

1.源代码

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include <string.h>
 4 int main()
 5 {
 6     char a;
 7     int count=0;
 8     FILE *fp;
 9     fp = fopen("data4.txt","r");
10     if(fp==NULL)
11     {
12         printf("fail to open\n");
13         system("pause");
14         return 0;
15     }
16     while(1)
17     {
18         a=fgetc(fp);
19         if(a==EOF)
20         break;
21         if(a==' '||a=='\n'||a=='\t')
22         count--;
23         count++;
24 
25     }
26     printf("data4.txt中共包含字符数(不计空白符):%d\n",count);
27     fclose(fp);
28     system("pause");
29     return 0;
30 }

 

2.运行结果

 

task.5

1.源代码

  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     system("pause");
 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     FILE* fscore;
 98     int i,cnt = 0;
 99      fscore = fopen("list_pass.txt", "r");
100      for ( i = 0; i < n; i++) {
101          st[i].sum = st[i].objective + st[i].subjective;
102      }
103  
104      for ( i = 0; i < n; i++) {
105          if (st[i].sum >= 60) {
106              strcpy(st[i].ans, "pass");
107              cnt++;
108          }
109          else {
110              strcpy(st[i].ans, "fail");
111          }
112      }
113  
114      return cnt;
115 }

 

2.运行结果

 

task.6

1.源代码

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<time.h>
 4 
 5 typedef struct{
 6     long id;
 7     char name[20];
 8     char ban[40];
 9 }xx;
10 int main()
11 {
12     xx a[5],x[80];
13     int i,n;
14     FILE *fp,*fps;
15     fp = fopen("list.txt","r");
16     if(fp==NULL) {
17         printf("fail to open\n");
18         return 1;
19     }
20     srand((double)time(NULL));
21     for(i=0;i<80;i++)
22     fscanf(fp,"%ld%s%s",&x[i].id,x[i].name,x[i].ban);
23     for(i=0;i<5;i++)
24     {
25     n=rand()%(204942080-204942001+1);
26     a[i]=x[n];
27     printf("%-20ld%-20s%-20s\n",a[i].id,a[i].name,a[i].ban);
28     }
29     fclose(fp);
30     fps=fopen ("lucky.txt","w");
31     if(fps==NULL)
32     {
33         printf("fail to open\n");
34         system("pause");
35         return 0;
36     }
37     for(i=0;i<5;i++)
38     fprintf(fps,"%-20ld%-20s%-20s\n",a[i].id,a[i].name,a[i].ban);
39     fclose(fps);
40     system("pause");
41     return 0;
42 }

 

2.运行结果

 

标签:int,printf,st,STU,实验,pass,t%
From: https://www.cnblogs.com/JUVBUFFON/p/17917011.html

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