1.实验任务4
1 #include<stdio.h>
2 int main()
3 {
4 char s[100];
5 FILE *fp;
6 int i = 0,j,k = 0;
7 char ch;
8 fp = fopen("data4.txt","rb");
9
10 if(fp == NULL)
11 {
12 printf("fail to open file\n");
13 return 1;
14 }
15 ch = fgetc(fp);
16 while(ch!=EOF)
17 {
18 s[i++] = ch;
19 ch = fgetc(fp);
20
21
22 }
23
24 for(j = 0;j<i-1;j++)
25 if(s[j]!=' ')
26 k++;
27
28 fclose(fp);
29 printf("data4.txt中共包含字符数（不计空白符）：%d",k-1);
30 return 0;
31 }
2.实验任务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; // 客观题得分
11 float subjective; // 操作题得分
12 float sum;
13 char level[10];
14 } STU;
15
16 // 函数声明
17 void input(STU s[], int n);
18 void output(STU s[], int n);
19 void process(STU s[], int n);
20
21 int main() {
22 STU stu[N];
23
24 printf("从文件读入%d个考生信息: 准考证号，姓名，客观题得分(<=40)，操作题得分(<=60)\n", N);
25 input(stu, N);
26
27 printf("\n对考生信息进行处理: 计算总分，确定等级\n");
28 process(stu, N);
29
30 printf("\n打印考生完整信息, 并保存到文件中");
31 output(stu, N);
32
33 return 0;
34 }
35
36 // 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
37 void input(STU s[], int n) {
38 int i;
39 FILE *fin;
40
41 fin = fopen("examinee.txt", "r");
42 if (fin == NULL) {
43 printf("fail to open file\n");
44 exit(0);
45 }
46
47 while (!feof(fin)) {
48 for (i = 0; i < n; i++)
49 fscanf(fin, "%ld %s %f %f", &s[i].id, s[i].name, &s[i].objective, &s[i].subjective);
50 }
51
52 fclose(fin);
53 }
54
55 // 输出考生完整信息: 准考证号，姓名，客观题得分，操作题得分，总分，等级
56 // 不仅输出到屏幕上，还写到文本文件result.txt中
57 void output(STU s[], int n) {
58 FILE *fout;
59 int i;
60
61 // 输出到屏幕
62 printf("\n");
63 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等级\n");
64 for (i = 0; i < n; i++)
65 printf("%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].level);
66
67 // 保存到文件
68 fout = fopen("result.txt", "w");
69 if (!fout) {
70 printf("fail to open or create result.txt\n");
71 exit(0);
72 }
73
74 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等级\n");
75
76 for (i = 0; i < n; i++)
77 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].level);
78
79 fclose(fout);
80 }
81
82 // 对考生信息进行处理：计算总分，排序，确定等级
83 void process(STU s[], int n) {
84 // 补足代码
85 // ×××
86 int i,j;
87 STU temp;
88 for(i = 0;i < n;i++)
89 s[i].sum = s[i].objective + s[i].subjective;
90
91 for(i = 0;i < n-1;i++)
92 for(j = 0;j < n-1;j++)
93 if(s[j].sum < s[j+1].sum)
94 {
95 temp = s[j];
96 s[j] = s[j+1];
97 s[j+1] = temp;
98 }
99
100
101 for(i = 0;i < n;i++)
102 {
103 if(i<(n/10))
104 strcpy(s[i].level,"优秀");
105 if(i>=(n/10)&&i<(n/2))
106 strcpy(s[i].level,"合格");
107 if(i>=(n/2))
108 strcpy(s[i].level,"不合格");
109
110 }
111
112
113
114 }
3.实验任务6
1 #include<stdio.h>
2 #include<stdlib.h>
3 #include<time.h>
4 #define N 80
5 int main()
6 {
7 typedef struct {
8 long int id;
9 char name[20];
10 char class[40];
11 } STU;
12 STU s[N];
13 FILE *fin;
14 int i,n;
15
16 fin = fopen("list.txt","r");
17 if(fin == NULL)
18 {
19 printf("fail to open\n");
20 exit(0);
21 }
22
23 while (!feof(fin))
24 {
25 for(i = 0;i < N;i++)
26 fscanf(fin, "%ld %s %s", &s[i].id, s[i].name, s[i].class);
27 }
28
29 srand(time(NULL));
30 int x[5];
31 for(i = 0;i < 5;i++)
32 x[i] = rand()% 80 + 1;
33
34 for(i =0;i < 5;i++)
35 {
36 printf("%ld\t%s\t%s\n",s[x[i]].id,s[x[i]].name,s[x[i]].class);
37 }
38
39 FILE *fout;
40 fout = fopen("lucky.txt", "w");
41 if (!fout) {
42 printf("fail to open or create result.txt\n");
43 exit(0);
44 }
45
46 for (i = 0; i < 5; i++)
47 fprintf(fout,"%ld\t%s\t%s\n",s[x[i]].id,s[x[i]].name,s[x[i]].class);
48
49 fclose(fout);
50
51 return 0;
52 }
