作业7

//task4//
1
#include<stdio.h> 2 3 int main(){ 4 int i = 0; 5 char ch; 6 FILE *fp; 7 fp = fopen("data4.txt","r"); 8 if(fp == NULL) { 9 printf("fail to open file\n"); 10 return 0; 11 } 12 while((ch=fgetc(fp))!=EOF) { 13 if (!(ch == ' ' || ch == '\n' || ch == '\t')){ 14 i++; 15 } 16 } 17 18 printf("data4.txt中共包含字符数(不计空白符):%d\n",i); 19 fclose(fp); 20 }

task5

  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_pass, cnt);      // 输出到屏幕
 35     foutput(stu_pass, cnt);    // 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 // 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
 94 int process(STU st[], int n, STU st_pass[]) {
 95    // 待补足
 96    // ×××
 97  int i,j = 0;
 98 
 99     for (i = 0; i < n; i++){
100         st[i].sum = st[i].objective + st[i].subjective;
101         if(st[i].sum >= 60){
102             strcpy(st[i].ans,"pass");
103             st_pass[j] = st[i];
104             j++;
105         }
106         else
107             strcpy(st[i].ans,"fail");
108     }
109 system("pause");
110     return j;
111 }

task6

 1 #include <stdio.h>
 2   #include <time.h>
 3   #include <stdlib.h>
 4   
 5   #define N 80
 6   #define M 100
 7   typedef struct {
 8       long int id;
 9       char name[10];
10      char c[20];
11  }STU;
12  
13  
14  int main(){
15      STU st[M];
16      int i,n;
17      FILE *fin;
18     FILE *fp;
19  
20     fin = fopen("list.txt", "r");
21    if (fin == NULL) {
22        printf("fail to open file\n");
23       exit(0);
24     }
25      
26      while (!feof(fin)){
27          for(i=0;i<N;i++)
28          fscanf(fin,"%ld %s %s",&st[i].id,st[i].name,st[i].c);
29     }
30 
31     fp = fopen("lucky.txt", "w");
32     if(fp == NULL) {
33          printf("fail to open file\n");
34         return 0;
35      }
36     
37     srand(time(0));
38      for(i=0;i<5;i++){
39      n=rand()%80;
40      fprintf(fp,"%ld %-10s %-20s\n",st[n].id,st[n].name,st[n].c);
41      printf("%ld %-10s %-20s\n",st[n].id,st[n].name,st[n].c);
42      }
43     
44    fclose(fin);
45     fclose(fp);
46     return 0;
47  }

 

posted on 2024-06-24 09:11  马猴烧酒酱  阅读(32)  评论(0)    收藏  举报