实验6 文件应用编程

#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;
}

#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;
    fp = fopen("data1.txt", "r");
    if (fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    i = 0;
    while (!feof(fp)) {
        fscanf(fp, "%s%s", x[i].name, x[i].author);
        ++i;
    }
    n = i - 1;
    for (i = 0; i < n; ++i)
        printf("%d. %-20s%-20s\n", i + 1, x[i].name, x[i].aut

 

hor);
    fclose(fp);
    return 0;
}

#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;
}

#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;
    fp = fopen("data2.dat", "rb");
    if (fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    fread(x, sizeof(Book), N, fp);
    for (i = 0; i < N; ++i)
        printf("%d. %-20s%-20s\n", i + 1, x[i].name, x[i].author);
    fclose(fp);
    return 0;
}

#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;
}

#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;
}

#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()
{
    int num=0;
    FILE* fp;
    char ch;
    if ((fp = fopen("data4.txt", "r"))==NULL)
        printf("fail to open it");
    ch = fgetc(fp);
    while (!feof(fp))
    {
        if (ch != ' ' &&  ch!= '\n' )
            num++;
        ch = fgetc(fp);
    }
    fclose(fp);
    printf("%d", num);
}

#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)
{
    STU temp;
    int i, j, k;

    for (i = 0; i < N; i++)
    {
        s[i].sum = s[i].objective  + s[i].subjective ;
    }
    for (i = 0; i < N - 1; i++)
    {
        for (j = 0; j < N - i - 1; j++)
        {
            if (s[j].sum < s[j + 1].sum)
            {
                temp = s[j + 1];
                s[j + 1] = s[j];
                s[j] = temp;
            }
        }
    }
    for (k = 0; k < N; k++)
    {
        switch (k)
        {
        case 0:strcpy(s[k].level, "优秀"); break;
        case 1:
        case 2:
        case 3:
        case 4:strcpy(s[k].level, "合格"); break;
        case 5:
        case 6:
        case 7:
        case 8:
        case 9:strcpy(s[k].level, "不合格"); break;
        }
    }
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<string.h>
#define N 80
#define M 5
typedef struct 
{
    long no;
    char name[10];
    char class[20];
}STU;
int main()
{
    STU list[N],lucky[M];
    FILE* fp1,*fp2;
    int i,j,random;
    if ((fp1 = fopen("list.txt", "r")) == NULL)
        printf("fail to open it");
    for (i = 0; i < N; i++)
        fscanf(fp1, "%ld %s %s", &list[i].no, list[i].name, list[i].class);
    fclose(fp1);
    srand((unsigned int)time(NULL));
    for (j = 0; j < M; j++)
    {
        random = rand() % N + 1;
        lucky[j] = list[random];
    }
    if ((fp2 = fopen("lucky.txt", "w")) == NULL)
        printf("fail to open it");
    for (j = 0; j < M; j++)
        fprintf(fp2, "%ld  %s   %s\n", lucky[j].no, lucky[j].name, lucky[j].class);
    fclose(fp2);
}