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实验6

时间:2022-12-24 17:01:38浏览次数:39  
标签:fp return int char 实验 printf define

// 将图书信息写入文本文件data1.txt
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define N 7
#define M 80
typedef struct {
    char name[M]; // 书名
    char author[M]; // 作者
} Book;
int main() {
    Book x[N] = { {"《雕塑家》","斯科特.麦克劳德"},
            {"《灯塔》", "克里斯多夫.夏布特"},
          {"《五号屠宰场》", "库尔特.冯内古特"},
    {"《出卖月亮的人》", "罗伯特.海因莱茵"},
    {"《大地之上》", "罗欣顿·米斯特里"},
            {"《上学记》", "何兆武"},
            {"《命运》", "蔡崇达"} };
    int i;
    FILE* fp;
    // 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\n");
        return 1;
    }
    // 将结构体数组x中的图书信息写到fp指向的文件data1.txt
    // 同时也输出到屏幕上
    for (i = 0; i < N; ++i) {
        fprintf(fp, "%-20s %-20s\n", x[i].name, x[i].author);
        printf("%-20s %-20s\n", x[i].name, x[i].author);
    }
    fclose(fp);
    return 0;
}

 

 

// 从文本文件data1.txt中读取图书信息,并打印输出到屏幕
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define N 10
#define M 80
typedef struct {
    char name[M]; // 书名
    char author[M]; // 作者
} Book;
int main() {
    Book x[N];
    int i, n;
    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\n");
        return 1;
    }
    // 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)) {
        fscanf(fp, "%s%s", x[i].name, x[i].author);
        ++i;
    }
    n = i -1;
    // 将图书信息打印输出到屏幕上
    for (i = 0; i < n; ++i)
        printf("%d. %-20s%-20s\n", i + 1, x[i].name, x[i].author);
    fclose(fp);
    return 0;
}

 

 

// 将图书信息写入二进制文件data2.dat
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define N 7
#define M 80
typedef struct {
    char name[M]; // 书名
    char author[M]; // 作者
} Book;
int main() {
    Book x[N] = { {"《雕塑家》", "斯科特.麦克劳德"},
            {"《灯塔》", "克里斯多夫.夏布特"},
          {"《五号屠宰场》", "库尔特.冯内古特"},
    {"《出卖月亮的人》", "罗伯特.海因莱茵"},
    {"《大地之上》", "罗欣顿·米斯特里"},
            {"《上学记》", "何兆武"},
            {"《命运》", "蔡崇达"} };
    int i;
    FILE* fp;
    // 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\n");
        return 1;
    }
    // 将结构体数组x中的图书信息以数据块方式写入文件data2.dat
    fwrite(x, sizeof(Book), N, fp);
    fclose(fp);
    return 0;
}

 

// 从二进制文件data2.dat读取图书信息,并打印输出到屏幕
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define N 7
#define M 80
typedef struct {
    char name[M]; // 书名
    char author[M]; // 作者
} Book;
int main() {
    Book x[N];
    int i;
    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\n");
        return 1;
    }
    // 从文件data2.dat以数据块方式读入图书信息数据到结构体数组x
    fread(x, sizeof(Book), N, fp);
    // 在屏幕上输出结构体数组x中存储的图书信息
    for (i = 0; i < N; ++i)
        printf("%d. %-20s%-20s\n", i + 1, x[i].name, x[i].author);
    fclose(fp);
    return 0;
}

 

 

// 使用fputs()将字符串写入文本文件
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define N 5
#define M 80
int main() {
    char songs[N][M] = { "Working\'s Blues",
              "Everything Will Flow",
              "Streets of London",
              "Perfect Day",
              "Philadelphia" };
    int i;
    FILE* fp;
    fp = fopen("data3.txt", "w");
    if (fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < N; ++i) {
        fputs(songs[i], fp);
        fputs("\n", fp);
    }

    fclose(fp);
    return 0;
}
// 使用fgets()从文件中读取字符串并在屏幕上显示
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define N 5
#define M 80
int main() {
    char songs[N][M];
    int i;
    FILE* fp;
    fp = fopen("data3.txt", "r");
    if (fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    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);
    return 0;
}

 

 

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main() {
    char ch;
    FILE* fp;
    fp = fopen("data3.txt", "r");
    if (fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    ch = fgetc(fp);
    while (ch != EOF) {
        putchar(ch);
        ch = fgetc(fp);
    }
    fclose(fp);
    return 0;
}

 

 

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main() {
    char ch;
    FILE* fp;
    fp = fopen("data3.txt", "r");
    if (fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    ch = fgetc(fp);
    int k = 0;
    while (ch != EOF) {
        k++;
        ch = fgetc(fp);
    }
    fclose(fp);
    printf("data4.txt中共包含字符数(不计空白格):%d", k);
    return 0;
}

 

 

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define N 10
typedef struct {
    long int id;
    char name[20];
    float objective; // 客观题得分
    float subjective; // 操作题得分
    float sum;
    char level[10];
} STU;
// 函数声明
void input(STU s[], int n);
void output(STU s[], int n);
void process(STU s[], int n);
int main() {
    STU stu[N];
    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);
        input(stu, N);
    printf("\n对考生信息进行处理: 计算总分,确定等级\n");
    process(stu, N);
    printf("\n打印考生完整信息, 并保存到文件中");
    output(stu, N);
    return 0;
}
// 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 input(STU s[], int n) {
    int i;
    FILE* fin;
    fin = fopen("examinee.txt", "r");
    if (fin == NULL) {
        printf("fail to open file\n");
        exit(0);
    }
    while (!feof(fin)) {
        for (i = 0; i < n; i++)
            fscanf(fin, "%ld %s %f %f", &s[i].id, s[i].name,
                &s[i].objective, &s[i].subjective);
    }
    fclose(fin);
}
// 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
// 不仅输出到屏幕上,还写到文本文件result.txt中
void output(STU s[], int n) {
    FILE* fout;
    int i;

    // 输出到屏幕
    printf("\n");
    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");
    for (i = 0; i < n; i++)
        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);
    // 保存到文件
    fout = fopen("result.txt", "w");
    if (!fout) {
        printf("fail to open or create result.txt\n");
        exit(0);
    }

    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");
    for (i = 0; i < n; i++)
        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);
    fclose(fout);
}
// 对考生信息进行处理:计算总分,排序,确定等级
void process(STU s[], int n) {
    // 补足代码
    // ×××
    STU t[N];
    for (int i = 0; i < n; i++) {
        s[i].sum = s[i].objective + s[i].subjective;
    }
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n - i; j++) {
            if (s[j].sum < s[j + 1].sum)
            {
                t[j] = s[j];
                s[j] = s[j + 1];
                s[j + 1] = t[j];
            }
        }
    for (int i = 0; i <= (int)N*0.1; i++)
    strcpy(s[i].level, "优秀");
    for (int i = (int)N*0.1+1; i <= (int)N*0.4; i++)
        strcpy(s[i].level, "合格");
    for (int i = (int)N * 0.4+1; i <= N; i++)
        strcpy(s[i].level, "不合格");
}

 

 

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include<stdlib.h>
#include<string.h>
#include<time.h>
int main() {
    FILE* fp;
    struct STU {
        long no;
        char name[80];
        char class[80];
    };
    struct STU t[80] = {0};
    fp = fopen("list.txt", "r");
    if (fp == NULL) {
        printf("fail to open file\n");
        exit(0);
    }
        int i = 0;
    while (!feof(fp)) {
        fscanf(fp, "%ld%s%s",&t[i].no, t[i].name, t[i].class);
        ++i;
    }
    fclose(fp);
    FILE* fg;
    time_t rawtime;
    struct tm* info;
    char buffer[80];

    time(&rawtime);

    info = localtime(&rawtime);

    strftime(buffer, 80, "%Y-%m-%d.txt", info);
    fg = fopen(buffer, "w");
    struct STU a[5];
    
    srand(time(NULL));
    for (int j = 0; j < 5; j++) {
        
        int i = rand()% 80 ;
        a[j] = t[i];
    }
    /*for (i = 1; i < 5; i++)
    {
        
        for (m = 0; m < i; m++)
        {
            if (a[m].no == a[i].no)

            {a[i] = t[rand() % 80];
            i--;
            }
        }
    }*/
    for(int i=0,j=4;i!=j;i++,j--)
        if (a[j].no == a[i].no)
        {
            a[i] = t[i];
            i = 0; j = 4;
        }
    
    for (int i = 0; i < 5; i++) {
    fprintf(fg, "%ld %s %s\n", a[i].no, a[i].name, a[i].class);
    printf("%ld %s %s\n", a[i].no, a[i].name, a[i].class);
    }
    fclose(fg);
    
    

}

 

标签:fp,return,int,char,实验,printf,define
From: https://www.cnblogs.com/tfbw/p/17003033.html

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