task1
1 #include<stdio.h>
2
3 #define N 80
4 #define M 100
5
6
7 typedef struct{
8 char name[N];
9 char author[N];
10 }Book;
11
12 void write();
13 void read();
14
15 int main(){
16 printf("测试1：把图书信息写入文本库\n");
17 write();
18
19 printf("\n测试2：从文本文件读取图书信息，打印输出到屏幕\n");
20 read();
21
22 return 0;
23
24 }
25
26 void write(){
27 Book x[] = { {"《雕塑家》", "斯科特.麦克劳德"},
28 {"《灯塔》", "克里斯多夫.夏布特"},
29 {"《人的局限性》", "塞缪尔.约翰生"},
30 {"《永不停步：玛格丽特.阿特伍德传》", "罗斯玛丽.沙利文"},
31 {"《大地之上》", "罗欣顿·米斯特里"},
32 {"《上学记》", "何兆武"},
33 {"《命运》", "蔡崇达"} };
34 int n,i;
35 FILE *fp;
36
37 n = sizeof(x)/sizeof(x[0]);
38
39 fp=fopen("datal.txt","w");
40
41 if(fp==NULL){
42 printf("fail to open file to write\n");
43 return ;
44
45 }
46
47 for(i = 0; i < n; ++i)
48 fprintf(fp, "%-40s %-20s\n",x[i].name,x[i].author);
49
50 fclose(fp);
51 }
52
53 void read(){
54 Book x[M];
55 int i,n;
56 int number;
57
58 FILE *fp;
59
60 fp=fopen("datal.txt","r");
61
62 if(fp==NULL){
63 printf("fail t0 open file to read\n");
64 return ;
65 }
66
67 i = 0;
68 while(!feof(fp)){
69 number = fscanf(fp,"%s%s",x[i].name,x[i].author);
70 if(number != 2)
71 break;
72 i++;
73 }
74 n = i;
75
76 for(i = 0 ;i < n; ++i)
77 printf("%d. %-40s%-20s\n", i+1,x[i].name,x[i].author);
78
79 fclose(fp);
80 }
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70-71行作用：从不正确输入的地方break，退出循环
task2
1 #include<stdio.h>
2
3 #define N 80
4 #define M 100
5
6 typedef struct{
7 char name[N];
8 char author[N];
9 }Book;
10
11 void write();
12 void read();
13
14 int main(){
15 printf("测试1：把图书信息以数据块方式写入二进制文件\n");
16 write();
17
18 printf("\n测试2：从二进制文件读取图书信息，打印输出到屏幕\n");
19 read();
20
21 return 0;
22 }
23
24 void write(){
25 Book x[] = { {"《雕塑家》", "斯科特.麦克劳德"},
26 {"《灯塔》", "克里斯多夫.夏布特"},
27 {"《人的局限性》", "塞缪尔.约翰生"},
28 {"《永不停步：玛格丽特.阿特伍德传》", "罗斯玛丽.沙利文"},
29 {"《大地之上》", "罗欣顿·米斯特里"},
30 {"《上学记》", "何兆武"},
31 {"《命运》", "蔡崇达"} };
32 int n;
33 FILE *fp;
34
35 n = sizeof(x) / sizeof(x[0]);
36
37 fp = fopen("data2.dat","wb");
38
39 if(fp == NULL){
40 printf("fail to open file to write\n");
41 return ;
42 }
43
44 fwrite(x,sizeof(Book),n,fp);
45
46 fclose(fp);
47 }
48
49 void read(){
50 Book x[M];
51 int i,n;
52 int number;
53
54 FILE *fp;
55
56 fp = fopen("data2.dat","rb");
57
58 if(fp == NULL){
59 printf("fail to open file to read\n");
60 return ;
61
62 }
63 i = 0;
64 while(!feof(fp)){
65 number = fread(&x[i],sizeof(Book),1,fp);
66 if (number != 1)
67 break;
68 i++;
69 }
70
71 n = i;
72 for(i = 0; i < n; ++i)
73 printf("%d. %-40s%-20s\n",i+1,x[i].name,x[i].author);
74
75 fclose(fp);
76
77 }
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task3
1 #include <stdio.h>
2 #define N 5
3 #define M 80
4
5 void write();
6 void read_str();
7 void read_char();
8
9 int main() {
10 printf("测试1: 把一组字符信息以字符串方式写入文本文件\n");
11 write();
12
13 printf("\n测试2: 从文件以字符串方式读取, 输出到屏幕\n");
14 read_str();
15
16 printf("\n测试3: 从文件以单个字符方式读取, 输出到屏幕\n");
17 read_char();
18
19 return 0;
20 }
21
22 void write() {
23 char *ptr[N] = { "Working\'s Blues",
24 "Everything Will Flow",
25 "Streets of London",
26 "Perfect Day",
27 "Philadelphia"};
28 int i;
29 FILE *fp;
30
31 fp = fopen("data3.txt", "w");
32 if(!fp) {
33 printf("fail to open file to write\n");
34 return;
35 }
36
37 for(i = 0; i < N; ++i) {
38 fputs(ptr[i], fp);
39 fputs("\n", fp);
40 }
41
42 fclose(fp);
43 }
44
45 void read_str() {
46 char songs[N][M];
47 int i;
48 FILE *fp;
49
50 fp = fopen("data3.txt", "r");
51 if(!fp) {
52 printf("fail to open file to read\n");
53 return;
54 }
55
56 for(i = 0; i < N; ++i)
57 fgets(songs[i], 80, fp);
58
59 for(i = 0; i < N; ++i)
60 printf("%d. %s", i+1, songs[i]);
61
62 fclose(fp);
63 }
64
65 void read_char() {
66 char ch;
67 FILE *fp;
68
69 fp = fopen("data3.txt", "r");
70 if(!fp) {
71 printf("fail to open file to read\n");
72 return;
73 }
74
75 while(!feof(fp)) {
76 ch = fgetc(fp);
77 if(ch == EOF)
78 break;
79
80 putchar(ch);
81 }
82
83 fclose(fp);
84 }
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task4
1 #include<stdio.h>
2 #define max 256
3 int main(){
4 FILE *fp;
5 char line[max];
6 int count_line = 0,count_char = 0;
7
8 fp = fopen("data4.txt","r");
9 if(fp == NULL){
10 printf("无法打开文件！\n");
11 return 0;
12 }
13
14 while(!feof(fp)){
15 fgets(line,sizeof(line),fp);
16 count_line++;
17 int i;
18 for(i = 0;line[i] != '\0';++i){
19 if(!isspace(line[i])){
20 count_char +=1;
21 }
22 }
23 }
24 fclose(fp);
25 printf("\ndata4.txt统计结果：\n");
26 printf("行数：%d\n",count_line);
27 printf("字符数（不含空白符）：%d\n",count_char);
28
29 return 0;
30 }
task5
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 FILE *fp;
75 int i;
76 fp=fopen("examinee.txt","w");
77 if(fp == NULL){
78 printf("fail to open file to write\n");
79 return 0;
80 }
81 for(i = 0; i < n; i++){
82 if(s[i].sum > 60)
83 fprintf(fp, "%ld%10s%10.2f%10.2f%10.2f%10s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);
84 }
85
86 fclose(fp);
87 }
88
89 // 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
90 int process(STU st[], int n, STU st_pass[]) {
91 int i , count = 0;
92 for(i = 0; i < n; i++){
93 st[i].sum = st[i].subjective + st[i].objective;
94 if(st[i].sum>=60){
95 st_pass[count]=st[i];
96 count++;
97 strcpy(st[i].result,"通过");
98 }
99 else
100 strcpy(st[i].result,"不通过");
101 }
102 return count;
103 }
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task6
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<time.h>
#define N 80
struct STU{
char num[N];
char name[N];
char classnum[N];
int tmp;
};
struct STU st[N],st_choose[N];
void choose(struct STU st[N],struct STU st_choose[N],int n);
void output(struct STU st_choose[N]);
void write(struct STU t_choose[N]);
void read(struct STU st[N],int n);
int main(){
int i;
for(i = 0; i < N; i++){
st[i].tmp = i+1;
read(st,N);
choose(st,st_choose,N);
output(st_choose);
write(st_choose);
}
return 0;
}
void read(struct STU st[],int n){
FILE *fp; int i;
fp=fopen("list.txt","r");
if(!fp){
printf("error");
return;
}
while(!feof(fp)){
for(i=1;i<=n;i++)
fscanf(fp,"%s %s %s",st[i].num,st[i].name,st[i].classnum);
}
fclose(fp);
}
void choose(struct STU st[N],struct STU st_choose[],int n){
int i,j,z,g=1;
int x[N]={0};
srand((unsigned)time(NULL));//设随机种子
for(i=1;i<=5;i++)
{
x[i]=rand()%n+1;
for(j=1;j<i;j++)
{ if(x[i]==x[j]) //保证随机数互不相同
i--;
}
}
for(i=1;i<=n;i++)
for(z=1;z<=5;z++)
if(st[i].tmp==x[z])
st_choose[g++]=st[i];
}
void output(struct STU st_choose[N]) {
int i,sum[N]={0},j; struct STU t;
printf("--------------随机抽点名单--------------\n");
//升序输出
for(i=1;i<=5;i++)
for(j=strlen(st_choose[i].num);j>7;j--)
sum[i]+=st_choose[i].num[j]-'0';//将字符学号存入一个数字数组中
for(i=1;i<=4;i++)//冒泡排序
for(j=1;j<=4-i;i++)
if(sum[j]>sum[j+1])
{ t=st_choose[j];
st_choose[j]=st_choose[j+1];
st_choose[j+1]=t;
}
for(i=1;i<=5;i++)
printf("%s %s %s\n",st_choose[i].num,st_choose[i].name,st_choose[i].classnum);
printf("--------------保存到文件------------\n");
}
void write(struct STU st_choose[N]){
int i; char str[N]; int info_day,info_month,info_year;
time_t rawtime; //声明初始时间
struct tm *info; //调用local函数产生的是结构体 ,定义info指针
time(&rawtime);
info=localtime(&rawtime);//调用localtime函数
strftime(str,80,"%Y%m%d",info);//调用strftime函数格式化
strcat(str,".txt");
FILE *fp;
fp=fopen(str,"w");
if(!fp)
{
printf("error");
return;
}
for(i=1;i<=5;i++)
fprintf(fp,"%s %s %s\n",st_choose[i].num,st_choose[i].name,st_choose[i].classnum);
fclose(fp);
printf("文件保存成功!");
}
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标签：fp,int,void,st,read,实验,printf From： https://www.cnblogs.com/YamadaRyo1314/p/18623181