1.实验任务4
程序task4.c源码 1 #include <stdio.h>
2 #define N 10
3 #define M 100
4
5
6 int main(){
7 char x[N][M];
8 int i,j,cnt=0,count=0;
9 FILE *fp;
10
11 fp = fopen("data4.txt", "r");
12 if(!fp) {
13 printf("fail to open file to read\n");
14 return;
15 }
16
17 for (i = 0; i < N && fgets(x[i], M, fp) != NULL; ++i) {
18 ++count;
19 }
20
21 for (i = 0; i < count; ++i) {
22 j = 0;
23 while (x[i][j] != '\0') {
24 char ch = x[i][j];
25
26 if (ch != ' ' && ch != '\n' && ch != '\r') {
27 ++cnt;
28 }
29 ++j;
30 }
31 }
32
33
34
35 fclose(fp);
36
37 printf("%s\n","data4.txt统计结果：");
38 printf("行数：%-20d\n",count);
39 printf("字符数（不计空白符）:%-20d\n",cnt);
40
41 return 0;
42 }
运行结果截图
5. 实验任务5 完整源码task5.c
1 #include <stdio.h>
2 #include <string.h>
3
4 #define N 10
5
6 typedef struct {
7 long id; // 准考证号
8 char name[20]; // 姓名
9 float objective; // 客观题得分
10 float subjective; // 操作题得分
11 float sum; // 总分
12 char result[10]; // 考试结果
13 } STU;
14
15 // 函数声明
16 void read(STU st[], int n);
17 void write(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 read(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); // 输出所有考生完整信息到屏幕
34 write(stu, N); // 输出考试通过的考生信息到文件
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 // 把所有考生完整信息输出到屏幕上
43 // 准考证号，姓名，客观题得分，操作题得分，总分，结果
44 void output(STU st[], int n) {
45 int i;
46
47 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");
48 for (i = 0; i < n; i++)
49 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);
50 }
51
52 // 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
53 void read(STU st[], int n) {
54 int i;
55 FILE *fin;
56
57 fin = fopen("examinee.txt", "r");
58 if (!fin) {
59 printf("fail to open file\n");
60 return;
61 }
62
63 while (!feof(fin)) {
64 for (i = 0; i < n; i++)
65 fscanf(fin, "%ld %s %f %f", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective);
66 }
67
68 fclose(fin);
69 }
70
71 // 把通过考试的考生完整信息写入文件list_pass.txt
72 // 准考证号，姓名，客观题得分，操作题得分，总分，结果
73 void write(STU s[], int n) {
74 // 待补足
75 int i;
76
77 FILE *fp;
78
79 fp=fopen("list_pass.txt","w");
80 if(!fp){
81 printf("fail to open file\n");
82 return;
83 }
84
85 fprintf(fp, "%-15s%-25s%-20s%-20s%-20s%-20s\n","准考证号","姓名","客观题得分","操作题得分","总分","结果");
86 for(i=0;i<n;i++){
87 if(strcmp(s[i].result,"通过")==0)
88 fprintf(fp, "%-15ld%-25s%-20.2f%-20.2f%-20.2f%-20s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);
89 }
90
91 fclose(fp);
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 // 待补足
98 int i,j;
99 for(i=0,j=0;i<n;i++){
100 st[i].sum=st[i].objective+st[i].subjective;
101 if(st[i].sum>=60){
102 strcpy(st[i].result,"通过");
103 st_pass[j++]=st[i];
104 }
105 else{
106 strcpy(st[i].result,"未通过");
107 }
108 }
109
110 return j;
111 }
运行结果截图（包括屏幕输出截图，和，文件list_pass.txt内容截图）
6. 实验任务6 此部分书写内容： 必做部分 源代码
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <time.h>
4
5 #define N 80
6
7 typedef struct{
8 char id[10];
9 char name[10];
10 char class[20];
11 }stu;
12
13 void read(stu s[N]);
15 void choose(stu s[],int n);
16
17 int main() {
18 stu s[N];
19 int i;
20
21 read(s);
22 choose(s,N);
23
24 return 0;
25 }
26
27 void read(stu s[N]){
28 int i=0;
29 FILE *fin;
30 fin=fopen("list.txt","r");
31 if(!fin){
32 printf("fail to open file\n");
33 return;
34 }
35
36 while(fscanf(fin, "%s %s %s", s[i].id, s[i].name, s[i].class) != EOF)
37 i++;
38
39 fclose(fin);
40 }
41
42 void choose(stu s[],int n){
43 FILE *fp;
44
45 int i,j,k=0,g;
46 int c[5];
47 char filename[20];
49 srand(time(NULL));
50
52 for (i = 0; k< 5; i++) {
53 j=rand()%n;
54 int is_duplicate = 0;
55 for(g=0;g<k;g++){
56 if(j==c[g])
57 is_duplicate = 1;
58 break;
59 }
60 if (!is_duplicate)
61 c[k++]=j;
62 }
63
64 printf("------------------随机抽点名单------------------\n");
65 for (i = 0; i < 5; i++) {
66 printf("%s\t%s\t%s\n", s[c[i]].id, s[c[i]].name, s[c[i]].class);
67 }
68
69 printf("\n------------------保存到文件------------------\n");
70 printf("输入文件名: ");
71 scanf("%s",filename);
72 fp=fopen(filename,"w");
73 if(!fp){
74 printf("fail to open the file");
75 return;
76 }
77 for (i = 0; i < 5; i++) {
78 fprintf(fp,"%s\t%s\t%s\n", s[c[i]].id, s[c[i]].name, s[c[i]].class);
79 }
80 fclose(fp);
81 printf("保存成功！\n");
82
83
84
85 }
运行测试截图
选做部分* 如果选做，请附上源代码
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <time.h>
4
5 #define N 80
6
7 typedef struct {
8 char id[10];
9 char name[10];
10 char class[20];
11 } stu;
12
13 void read(stu s[N]);
14 void choose(stu s[], int n);
15 void generate_filename(char *filename);
16
17 int main() {
18 stu s[N];
19 read(s);
20 choose(s, N);
21 return 0;
22 }
23
24 void read(stu s[N]) {
25 int i = 0;
26 FILE *fin;
27 fin = fopen("list.txt", "r");
28 if (!fin) {
29 printf("fail to open file\n");
30 return;
31 }
32 while (fscanf(fin, "%s %s %s", s[i].id, s[i].name, s[i].class) != EOF)
33 i++;
34 fclose(fin);
35 }
36
37 void choose(stu s[], int n) {
38 FILE *fp;
39 int i, j, k = 0, g;
40 stu t;
41 stu selected[5];
42 int c[5];
43 char filename[20];
44 srand(time(NULL));
45
46 for (i = 0; k < 5; i++) {
47 j = rand() % n;
48 int is_duplicate = 0;
49 for (g = 0; g < k; g++) {
50 if (j == c[g]) {
51 is_duplicate = 1;
52 break;
53 }
54 }
55 if (!is_duplicate)
56 c[k++] = j;
57 }
58
59 for (i = 0; i < 5; i++) {
60 selected[i] = s[c[i]];
61 }
62
63 for (i = 0; i < k; i++) {
64 for (j = 0; j < k - 1 - i; j++) {
65 if (strcmp(selected[j].id, selected[j + 1].id) > 0) {
66 t = selected[j];
67 selected[j] = selected[j + 1];
68 selected[j + 1] = t;
69 }
70 }
71 }
72
73 printf("------------------随机抽点名单------------------\n");
74 for (i = 0; i < 5; i++) {
75 printf("%s\t%s\t%s\n", selected[i].id, selected[i].name, selected[i].class);
76 }
77
78 printf("\n------------------保存到文件------------------\n");
79 generate_filename(filename);
80 fp = fopen(filename, "w");
81 if (!fp) {
82 printf("fail to open the file");
83 return;
84 }
85 for (i = 0; i < 5; i++) {
86 fprintf(fp, "%s\t%s\t%s\n", selected[i].id, selected[i].name, selected[i].class);
87 }
88 fclose(fp);
89 printf("保存成功！\n");
90 }
91
92 void generate_filename(char *filename) {
93 time_t now;
94 struct tm *local;
95 char date[20];
96 time(&now);
97 local = localtime(&now);
98 strftime(date, sizeof(date), "%Y%m%d", local);
99 sprintf(filename, "%s.txt", date);
100 }
运行测试截图
标签：int,++,st,stu,实验,printf,fin From： https://www.cnblogs.com/gwy1004/p/18622785