实验7

task1

#include <stdio.h>
#define N 80
#define M 100

typedef struct {
    char name[N];   
    char author[N];  
} Book;

void func1();
void func2();
int main() {
    func1();
    func2();
    
    return 0;
}
void func1() {
    Book x[] = { {"《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 n, i;
    FILE *fp;
    n = sizeof(x) / sizeof(Book);       
    fp = fopen("data1.txt", "w");
    if(fp == NULL) {
        printf("fail to open file\n");
        return;
    }
    for(i = 0; i < n; ++i)
        fprintf(fp, "%-20s %-20s\n", x[i].name, x[i].author);
    
    fclose(fp);
}
void func2() {
    Book x[M]; 
    int i, n;
    
    FILE *fp;
    fp = fopen("data1.txt", "r");
    if(fp == NULL) {
        printf("fail to open file\n");
        return;
    }
   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].author);
    
    fclose(fp);
}

task2.1

#include <stdio.h>
#define N 80
#define M 7

typedef struct {
    char name[N];   
    char author[N];
} Book;
void func1();
void func2();

int main() {
    func1();
    func2();
    
    return 0;
}
void func1() {
    Book x[M] = { {"《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 n, i;
    
    FILE *fp; 
    fp = fopen("data2.dat", "wb"); 
    if(fp == NULL) {
        printf("fail to open file\n");
        return;
    }
    fwrite(x, sizeof(Book), M, fp);
    
    fclose(fp);
}
void func2() {
    Book x[M];
    int i;
    
    FILE *fp; 
    fp = fopen("data2.dat", "rb"); 
    if(fp == NULL) {
        printf("fail to open file\n");
        return;
    }
    fread(x, sizeof(Book), M, fp);
    for(i = 0; i < M; ++i)
        printf("%d. %-20s%-20s\n", i+1, x[i].name, x[i].author);
    
    fclose(fp);
}

2.2

#include <stdio.h>
#define N 80
#define M 7

typedef struct {
    char name[N];   
    char author[N]; 
} Book;
void func1();
void func2();

int main() {
    func1();
    func2();
    
    return 0;
}
void func1() {
    Book x[M] = { {"《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 n, i;
    
    FILE *fp;
    fp = fopen("data2.dat", "wb");
    if(fp == NULL) {
        printf("fail to open file\n");
        return;
    }
    fwrite(x, sizeof(Book), M, fp);
    
    fclose(fp);
}
void func2() {
    Book x[N];
    int i, cnt;
    
    FILE *fp;
    fp = fopen("data2.dat", "rb");
    if(fp == NULL) {
        printf("fail to open file\n");
        return;
    }
    i = 0;
    while(!feof(fp)) {
        fread(&x[i], sizeof(Book), 1, fp);
        i++;
    }
    cnt = i - 1;
    for(i = 0; i < cnt; ++i)
        printf("%d. %-20s%-20s\n", i+1, x[i].name, x[i].author);
    
    fclose(fp);
}

task3

#include <stdio.h>
#define N 5
#define M 80
void func1();
void func2();
void func3();

int main() {
    func1();
    func2();
    func3();

    return 0;
}
void func1() {
    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 == NULL) {
        printf("fail to open file\n");
        return;
    }

    for(i = 0; i < N; ++i) {
        fputs(ptr[i], fp);  
        fputs("\n", fp);
    }
    
    fclose(fp);
}
void func2() {
    char songs[N][M];
    int i;
    FILE *fp;

    fp = fopen("data3.txt", "r");
    if(fp == NULL) {
        printf("fail to open file\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 func3() {
    char ch;
    FILE *fp;

    fp = fopen("data3.txt", "r");
    if(fp == NULL) {
        printf("fail to open file\n");
        return;
    }

    while(!feof(fp)) {
        ch = fgetc(fp);
        if(ch == EOF)
            break;
        
        putchar(ch);
    }

    fclose(fp);
}

 task 4

#include <stdio.h>
int main()
{
    FILE *fp;
    char ch;
    int count=0;
    fp=fopen("data4.txt","r");
    if(fp == NULL)
    {
        printf("fail to open file\n");
        return;
    }
    while((ch=fgetc(fp)) != EOF)
    {
        if(ch != ' ' && ch != '\n' && ch != '\t')
            count++;
    }
    fclose(fp);
    printf("data4.txt中共包含字符数（不计空白符）：%d",count);

    return 0;
}

task 5

#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;          // 总分
    char ans[10];       // 考试结果
} STU;

// 函数声明
void finput(STU st[], int n);
void foutput(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);
    finput(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_pass, cnt);      // 输出到屏幕
    foutput(stu_pass, cnt);    // 输出到文件

    pass_rate = 1.0 * cnt / N;
    printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100);

    return 0;
}

// 把通过考试的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].ans);
}

// 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 finput(STU st[], 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", &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 foutput(STU s[], int n) {
    FILE *fout;
    int i;
    
    // 保存到文件 
    fout = fopen("list_pass.txt", "w");
    if (!fout) {
        printf("fail to open or create list_pass.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结果\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].ans);

    fclose(fout);
}

// 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
int process(STU st[], int n, STU st_pass[]) {
   int i,j=0;
   for(i=0;i<n;i++){
       st[i].sum=st[i].subjective + st[i].objective;
       if(st[i].sum >= 60){
           strcpy(st[i].ans,"pass");
           st_pass[j++]=st[i];
       }
    else
        strcpy(st[i].ans,"fail");   
   }
   return j;
}

task 6

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#define M 100
#define N 80

typedef struct {
    long int id;
    char name[10];
    char c[20];
}STU;


int main(){
    STU st[M];
    int i,n;
    FILE *fin;
    FILE *fp;

    fin = fopen("list.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 %s",&st[i].id,st[i].name,st[i].c);
    }

    fp = fopen("lucky.txt", "wb");
    if(fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }

    srand(time(0));
    for(i=0;i<5;i++){
    n=rand()%N;
    fprintf(fp,"%ld %-10s %-20s\n",st[n].id,st[n].name,st[n].c);
    printf("%ld %-10s %-20s\n",st[n].id,st[n].name,st[n].c);
    }

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