实验五

task1_1.c

#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;
    
}

 

task1_2.c

//本文件data.1.txt中读取图书信息，并打印输出屏幕 
#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;
    //以只读的方式打开文本data.1.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fp 指向的文件data.1.txt中读取信息到结构体数组x
//同时，把x的内容输出到屏幕上

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;从文
 } 


 x[i].name本身就是地址，不需要加地址符

task2_2.c

//将图书信息以数据块的方式写入二进制文件data2.dat
#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中的图书信息以数据块的方式写入文件
    //把从地址x处开始sizeof(Book)×N 个字节大小的数据写入fp指向的文件
    fwrite(x,sizeof(Book),N,fp);
    
    fclose(fp);
    return 0; 
}
 

生成了data2.dat并且用word打开可见

task3_1.c

//从文件data3.txt读取信息，将小写字母转换成大写后，写入data3_2.txt
#include<stdio.h>

int main()
{
    FILE *fin,*fout;
    char ch;
    
    //以只读、文本方式打开文件data3_1.txt
    fin = fopen("data3_1.txt","r");
    
     //如果打开文件失败，输出提示信息并返回
    if(fin==NULL)
    {
        printf("fail to open data3_1.txt\n");
        return 1;
     } 
     //以写、文本方式打开 文件data3_1.txt
     fout = fopen("data3_2.txt","w");
     
     //如果打开文件失败，输出提示信息并返回
    if(fout==NULL)
    {
        printf("fail to open data3_2.txt\n");
        return 1;
     } 
     
     //当fin指向的文件data3_1.txt没有结束时
     while( !feof(fin))
     {
         //从fin指向的文件 data3_1.txt中读取单个字符
         ch=fgetc(fin);
         
         //如果ch 是小写字母，转换成大写
         if(ch>='a'&&ch<='z')
         ch-=32;
         //将ch中的字符写入fout指向的 data3_2.txt
         fputc(ch,fout);
      } 
      fclose(fin);
      fclose(fout);
      return 0;
 } 

task3_2.c

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

task5.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define N 10
typedef struct
{
    long int id;
    char name[20];
    float objective;
    float subjective; 
    float sum;
    char level[10];
} STU;
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);
    system("pause");
    return 0;
}
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);
}
void output(STU s[], int n)
{
    FILE *fout;

    int i;
    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);

    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);
}
void process(STU s[], int n)
{
    int i,j,t;
    
    for(i=0;i<n;i++)
    {
        s[i].sum=(s[i].objective)+(s[i].subjective);
    }
    for(j=0;j<n;j++)
    {
        for(i=0;i<n-j;i++)
        {
            if(s[i].sum<s[i+1].sum)
            {
                t=s[i+1].sum;
                s[i+1].sum=s[i].sum;
                s[i].sum=t;}
        }    
    
    }

    for(i=0;i<1;i++)
    {
    strcpy(    s[i].level,"优秀");}
    for(;i>=1&&i<5;i++)
        strcpy(s[i].level,"合格");
    for(;i<n;i++)
        strcpy(s[i].level,"不合格");
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 5
#define M 80
typedef struct
{
    char id[20];
    char name[20];
    char banji[20];
}lucky;
int main()
{
    int i, j;
    lucky s[M];
    FILE* fin;
    FILE* fout;
    srand(time(0));
    fin = fopen("list.txt", "r");
    if (fin == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < M; i++)
    {
        fscanf(fin, "%s %s %s\n", s[i].id, s[i].name, s[i].banji);
    }

    fout = fopen("lucky.txt", "w");
    if (fout == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < N; i++)
    {
        j = rand() % 80;
        printf("%-20s %-20s %-20s\n", s[j].id, s[j].name, s[j].banji);
        fprintf(fout, "%-20s %-20s %-20s\n", s[j].id, s[j].name, s[i].banji);
    }
    fclose(fin);
    fclose(fout);
    return 0;

}

 

task5

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 5
#define M 80
typedef struct
{
    char id[20];
    char name[20];
    char banji[20];
}lucky;
int main()
{
    int i, j;
    lucky s[M];
    FILE* fin;
    FILE* fout;
    srand(time(0));
    fin = fopen("list.txt", "r");
    if (fin == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < M; i++)
    {
        fscanf(fin, "%s %s %s\n", s[i].id, s[i].name, s[i].banji);
    }

    fout = fopen("lucky.txt", "w");
    if (fout == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < N; i++)
    {
        j = rand() % 80;
        printf("%-20s %-20s %-20s\n", s[j].id, s[j].name, s[j].banji);
        fprintf(fout, "%-20s %-20s %-20s\n", s[j].id, s[j].name, s[i].banji);
    }
    fclose(fin);
    fclose(fout);
    return 0;

}