实验5

#include <stdio.h>
#define N 5
#define M 80

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

int main()
{
    Book x[N]={{"一九四八","乔治.奥威尔"},
              {"美丽新世界","赫胥黎"},
              {"昨日的世界","斯蒂芬.茨威格"},
              {"万历十五年","黄仁宇"},
              {"一只特立独行的猪","王小波"}
              };
              int i;
              FILE *fp;
              
              fp=fopen("datal.txt","w");
              if(fp==NULL)
              {
                  printf("fail to open file\n");
                  return 1;
              }
              
              for(i=1;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;
              }

　　

#include <stdio.h>
#define N 5
#define M 80

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


int main()
{
    Book x[N];
    int i;
    
    FILE *fp;
    fp=fopen("data1.txt","r");
    
    if(fp==NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    
    for(i=0;i<N;++i)
    {
        fscanf(fp,"%s %s\n",x[i].name,x[i].author);
        printf("%-20s %-20s\n",x[i].name,x[i].author);
    }
    
    fclose(fp);
    return 0;
}

 

　　

#include <stdio.h>
#define N 5
#define M 80
typedef struct
{
char name[M]; // 书名
char author[M]; // 作者
}Book;
int main()
{
Book x[N] = { {"一九八四", "乔治.奥威尔"},
            {"美丽新世界", "赫胥黎"},
            {"昨日的世界", "斯蒂芬.茨威格"},
            {"万历十五年", "黄仁宇"},
            {"一只特立独行的猪", "王小波"}
             };
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中的图书信息写以数据块方式写入文件
// 把从地址x处开始sizeof(Book)×N个字节大小的数据块写入fp指向的文件
fwrite(x, sizeof(Book), N, fp);
fclose(fp);
}

　　

 

#include <stdio.h>
#define N 5
#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fp指向的文件中读取数据块到x对应的地址单元
// 数据块大小为sizeof(Book)×N
fread(x, sizeof(Book), N, fp);
// 在屏幕上输出结构体数组x中保存的数据
for(i=0; i<N; ++i)
printf("%-20s%-20s\n", x[i].name, x[i].author);
fclose(fp);
return 0;
}

 

#include <stdio.h>
int main()
{
    int i=0;
    FILE*fp;
    char ch;
    
    fp=fopen("data3_1.txt","r");
    if(fp==NULL)
    {
        printf("fail to find file\n");
        return 1;
    }
    
    while ((ch=fgetc(fp))!=EOF)
    {
        if(ch!='\n'&&ch!=' '&&ch!='\t')
        i++;
    }
    
    printf("data3_1.txt中共包含字符数：%d",i);
    
    fclose(fp);
    
    return 0;
}

 

#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)
{
   int i,j;
    STU t[10];
    for (i = 0; i < n; i++)
    {
        s[i].sum = s[i].subjective + s[i].objective;
    }
    for (j = 1; j < n * n / 2; j++)
    {
        for (i = 0; i < n - 1; i++)
        {
            if (s[i].sum < s[i+1].sum)
            {
                t[i] = s[i];
                s[i] = s[i + 1];
                s[i + 1] = t[i];
            }

        }
    }
    i = 0;
    while (i < n)
    {
        if (i == 0)
            strcpy(s[i].level, "优秀");
        else if (i >= 1 && i <= 4)
            strcpy(s[i].level, "合格");
        else
            strcpy(s[i].level, "不合格");
        i++;
    }
}

 

#include<stdio.h>
#include<time.h>
#include<stdlib.h>
struct stu
{
    long int xuehao;
    char s[20];
    char l[100];
};
int main()
{
    struct stu std[80];
    srand(time(0));
    FILE *fp,*f;
    fp=fopen("list.txt","r");
    f=fopen("lucky.txt","w+");
    int i,sjs,j,y=0,x;
    for(i=0;i<80;i++)
    {
        fscanf(fp,"%ld %s %s",&std[i].xuehao,std[i].s,std[i].l);
    }
    for(j=0;j<5;j++)
    {
        sjs=rand()%80;
        if(sjs==y) continue;
        y=sjs;
        for(i=0;i<80;i++)
        {
            x=std[i].xuehao%100;
            if(sjs==x)
            {
                printf("%-20d %-20s %-20s\n",std[i].xuehao,std[i].s,std[i].l);
                fprintf(f,"%ld %s %s\n",&std[i].xuehao,std[i].s,std[i].l);
            }
        }
    }
    fclose(fp);
    fclose(f);
    return 0;
}