实验七

实验一：

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define N 80
#define M 100
typedef struct {
    char name[N]; // 书名
    char author[N]; // 作者
} Book;
void write();
void read();
int main() {
    printf("测试1: 把图书信息写入文本文件\n");
    write();
    printf("\n测试2: 从文本文件读取图书信息, 打印输出到屏幕\n");
    read();
    return 0;
}
void write() {
    Book x[] = { {"《雕塑家》", "斯科特.麦克劳德"},
    {"《灯塔》", "克里斯多夫.夏布特"},
    {"《人的局限性》", "塞缪尔.约翰生"},
    { "《永不停步：玛格丽特.阿特伍德传》", "罗斯玛丽.沙利文" },
{"《大地之上》", "罗欣顿·米斯特里"},
{"《上学记》", "何兆武"},
{"《命运》", "蔡崇达"} };
    int n, i;
    FILE* fp;
    // 计算数组x中元素个数
    n = sizeof(x) / sizeof(x[0]);
    // 以写的方式打开文本文件data1.txt
    fp = fopen("data1.txt", "w");
    // 如果打开文件失败，输出提示信息并返回
    if (fp == NULL) {
        printf("fail to open file to write\n");
        return;
    }
    // 将结构体数组x中的图书信息格式化写到fp指向的文件data1.txt
    for (i = 0; i < n; ++i)
        fprintf(fp, "%-40s %-20s\n", x[i].name, x[i].author);
    fclose(fp);
}
void read() {
    Book x[M];
    int i, n;
    int number;
    FILE* fp;
    // 以读的方式打开文本文件data1.txt
    fp = fopen("data1.txt", "r");
    // 如果打开文件失败，输出提示信息并返回
    if (fp == NULL) {
        printf("fail to open file to read\n");
        return;
    }
    // 从文件中读取图书信息，保存到结构体数组x中
    i = 0;
    while (!feof(fp)) {
        number = fscanf(fp, "%s%s", x[i].name, x[i].author);
        if (number != 2)
            break;
        i++;
    }
    n = i;
    // 将图书信息打印输出到屏幕上
    for (i = 0; i < n; ++i)
        printf("%d. %-40s%-20s\n", i + 1, x[i].name, x[i].author);
    fclose(fp);
}

实验二

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define N 80
#define M 100
typedef struct {
    char name[N]; // 书名
    char author[N]; // 作者
} Book;
void write();
void read();
int main() {
    printf("测试1: 把图书信息以数据块方式写入二进制文件\n");
    write();
    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");
    read();
    return 0;
}
void write() {
    Book x[] = { {"《雕塑家》", "斯科特.麦克劳德"},
    {"《灯塔》", "克里斯多夫.夏布特"},
    {"《人的局限性》", "塞缪尔.约翰生"},
    {"《永不停步：玛格丽特.阿特伍德传》", "罗斯玛丽.沙利文"},
    {"《大地之上》", "罗欣顿·米斯特里"},
    {"《上学记》", "何兆武"},
    {"《命运》", "蔡崇达"} };
    int n;
    FILE* fp;
    // 计算数组x中元素个数
    n = sizeof(x) / sizeof(x[0]);
    // 以写的方式打开二进制文件data2.dat
    fp = fopen("data2.dat", "wb");
    // 如果打开文件失败，输出提示信息并返回
    if (fp == NULL) {
        printf("fail to open file to write\n");
        return;
    }
    // 将结构体数组x中的图书信息以数据块方式写入二进制文件data2.dat
    fwrite(x, sizeof(Book), n, fp);
    fclose(fp);
}
void read() {
    Book x[M];
    int i, n;
    int number;
    FILE* fp;
    // 以读的方式打开二进制文件data2.dat
    fp = fopen("data2.dat", "rb");
    // 如果打开文件失败，输出提示信息并返回
    if (fp == NULL) {
        printf("fail to open file to read\n");
        return;
    }
    // 从二进制文件data2.dat以数据块方式读取图书信息存储到结构体数组x
    i = 0;
    while (!feof(fp)) {
        number = fread(&x[i], sizeof(Book), 1, fp);
        if (number != 1)
            break;
        i++;
    }
    // 在屏幕上打印输出
    n = i;
    for (i = 0; i < n; ++i)
        printf("%d. %-40s%-20s\n", i + 1, x[i].name, x[i].author);
    fclose(fp);
}

实验3

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define N 5
#define M 80
void write();
void read_str();
void read_char();
int main() {
    printf("测试1: 把一组字符信息以字符串方式写入文本文件\n");
    write();
    printf("\n测试2: 从文件以字符串方式读取, 输出到屏幕\n");
    read_str();
    printf("\n测试3: 从文件以单个字符方式读取, 输出到屏幕\n");
    read_char();
    return 0;
}
void write() {
    char* ptr[N] = { "Working\'s Blues",
    "Everything Will Flow",
    "Streets of London",
    "Perfect Day",
        "Philadelphia" };
    int i;
    FILE* fp;
    fp = fopen("data3.txt", "w");
    if (!fp) {
        printf("fail to open file to write\n");
        return;
    }
    for (i = 0; i < N; ++i) {
        fputs(ptr[i], fp);
        fputs("\n", fp);
    }
    fclose(fp);
}
void read_str() {
    char songs[N][M];
    int i;
    FILE* fp;
    fp = fopen("data3.txt", "r");
    if (!fp) {
        printf("fail to open file to read\n");
        return;
    }
    for (i = 0; i < N; ++i)
        fgets(songs[i], 80, fp);
    for (i = 0; i < N; ++i)
        printf("%d. %s", i + 1, songs[i]);
    fclose(fp);
}
void read_char() {
    char ch;
    FILE* fp;
    fp = fopen("data3.txt", "r");
    if (!fp) {
        printf("fail to open file to read\n");
        return;
    }
    while (!feof(fp)) {
        ch = fgetc(fp);
        if (ch == EOF)
            break;
        putchar(ch);
    }
    fclose(fp);
}

\是转义字符

实验4

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define N 80
#define M 80
void read_row() {
    FILE* fp;
    char x[M][N];
    fp = fopen("C:\\Users\\ASUS\\Desktop\\实验7数据文件及部分代码\\data4.txt", "r");
    if (fp==NULL) {
        printf("fail to open file");
        return;
    }
    int i = 0;
    while (!feof(fp)) {
        fgets(x[i], 80, fp);
        i++;
    }
    printf("行数：%d\n", i);
    fclose(fp);
}
void number_char() {
    FILE* fp;
    char x;
    int i = 0;
    fp = fopen("C:\\Users\\ASUS\\Desktop\\实验7数据文件及部分代码\\data4.txt", "r");
    if (fp == NULL) {
        printf("fail to open file");
        return;
    }
    while (!feof(fp)) {
        x = fgetc(fp);
        if (x == EOF) {
            break;
        }
        else if (x == ' ' || x == '\n') {

        }
        else {
            i++;
        }
    }
    printf("字符数：%d", i);
}
int main() {
    printf("data4.txt统计结果：\n");
    read_row();
    number_char();
}

实验5

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#define N 10
typedef struct {
    long id;
    char name[20]; // 姓名
    float objective; // 客观题得分
    float subjective; // 操作题得分
    float sum; // 总分
    char result[10]; // 考试结果
} STU;
// 函数声明
void read(STU st[], int n);
void write(STU st[], int n);
void output(STU st[], int n);
int process(STU st[], int n, STU st_pass[]);
int main() {
    STU stu[N], stu_pass[N];
    int cnt;
    double pass_rate;
    printf("从文件读入%d个考生信息...\n", N);
    read(stu, N);
    printf("\n对考生成绩进行统计...\n");
    cnt = process(stu, N, stu_pass);
    printf("\n通过考试的名单:\n");
    output(stu, N); // 输出所有考生完整信息到屏幕
    write(stu, N); // 输出考试通过的考生信息到文件
    pass_rate = 1.0 * cnt / N;
    printf("\n本次等级考试通过率: %.2f%%\n", pass_rate * 100);
    return 0;
}
// 把所有考生完整信息输出到屏幕上
// 准考证号，姓名，客观题得分，操作题得分，总分，结果
void output(STU st[], int n) {
    int i;
    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");
    for (i = 0; i < n; i++)
        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);
}
// 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
void read(STU st[], int n) {
    int i;
    FILE* fin;
    fin = fopen("examinee.txt", "r");
    if (!fin) {
        printf("fail to open file\n");
        return;
    }
    while (!feof(fin)) {
        for (i = 0; i < n; i++)
            fscanf(fin, "%ld %s %f %f", &st[i].id, st[i].name, &st[i].objective,
                &st[i].subjective);
    }
    fclose(fin);
}
// 把通过考试的考生完整信息写入文件list_pass.txt
// 准考证号，姓名，客观题得分，操作题得分，总分，结果
void write(STU s[], int n) {
    // 待补足
    // xxx
    // 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
    FILE* fp;
    fp = fopen("list_pass.txt", "w");
    if (!fp) {
        printf("fail to open file\n");
        return;
    }
    for (int i = 0; i < n; ++i) {
        if (strcmp(s[i].result, "pass") == 0) {
            fprintf(fp, "%101d%-20s%-10f%-10f%-10f%-10s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum
                , s[i].result);
        }
    }
    fclose(fp);
}
int process(STU st[], int n, STU st_pass[]) {
    for (int i = 0; i < n; ++i) {
        st[i].sum = st[i].objective + st[i].subjective;
        if (st[i].sum > 60) {
            strcpy(st[i].result, "pass");
        }
        else {
            strcpy(st[i].result, "no pass");
        }
    }
    int j = 0;
    for (int i = 0; i < n; i++) {

        if (strcmp(st[i].result, "pass") == 0) {
            st_pass[j] = st[i];
            j++;
        }

    }
    return j;
}

 

实验6

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 80

typedef struct {
    int number;
    char name[10];
    char class[20];
    int prize;
}STU;

void read(STU s[]) {
    FILE* fp;
    fp = fopen("list.txt", "r");
    if (fp == NULL) {
        printf("fail to open file");
        return;
    }
    int i = 0;
    while (fscanf(fp, "%d%s%s", &s[i].number, s[i].name, s[i].class) == 3) {
        i++;
    }
    fclose(fp);
}

void chose(STU s[]) {
    int j = 5;
    srand(time(NULL));
    for (int i = 0; i < j; ++i) {
        int random = rand() % 80;
        if (s[random].prize == 1) {
            j++;
        }
        else {
            s[random].prize = 1;
        }
    }
}

void showname(STU s[],int n) {
    STU s_p[5];
    int i;
    int j = 0;
    for (i = 0; i < n; ++i) {
        if (s[i].prize == 1) {
            s_p[j] = s[i];
            j++;
        }
    }
    STU temp;
    for (int k = 0; k < 4; ++k) {
        for (int m = 0; m < 4-k; ++m) {
            if (s_p[m].number > s_p[m + 1].number) {
                temp = s_p[m];
                s_p[m] = s_p[m + 1];
                s_p[m + 1] = temp;
            }
                
        }
    }
    printf("中奖名单：\n");
    for (int k = 0; k < 5; ++k) {
        printf("%-20d%-20s%-20s\n", s_p[k].number, s_p[k].name, s_p[k].class);
    }
}

void write(STU s[]) {
    FILE* fp;
    fp = fopen("list_p.txt", "w");
    if (fp == NULL) {
        printf("文件打开失败\n");
        return;
    }
    for (int i = 0; i < 5; ++i) {
        fprintf(fp, "%-20d%-20s%-20s\n", s[i].number, s[i].name, s[i].class);
    }
    fclose(fp);
}

int main() {
    STU student[80];
    read(student);
    chose(student);
    showname(student, N);
    write(student);


}