实验五

一:

1,

#define _CRT_SECURE_NO_WARNINGS
#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;
    fp = fopen("data1.txt", "w");
    if (fp == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    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;
}

 

 

2,

#define _CRT_SECURE_NO_WARNINGS
#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;
}

x[i].name和x[i].author本身就是地址,不需要添加地址符

 

二,

1,

#define _CRT_SECURE_NO_WARNINGS
#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;
    fp = fopen("data2.dat", "wb");
    if (fp == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    fwrite(x, sizeof(Book), N, fp);
    fclose(fp);
    return 0;
}

 

 

2,

#define _CRT_SECURE_NO_WARNINGS
#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("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("%-20s%-20s\n", x[i].name, x[i].author);
    fclose(fp);
    return 0;
}

 

是,但需要用word打开

 

三:

#include <stdlib.h>
#include <stdio.h>
int main()
{
    FILE *fin;
    char ch;
    long count=0;
    fin=fopen("data3_1.txt","r");

    if(fin==NULL)
    {
        printf("fail to open data3_1.txt\n");
        return 1;
    
    
    
    }


    while((ch=fgetc(fin))!=EOF)
        {
            if(ch!=' '&&ch!='    '&&ch!='\n')
            count++;}
    printf("%d",count);

    fclose(fin);




system("pause");
}

 

 

五;

#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;
     for(i=0;i<n;i++)
     {
         s[i].sum=(s[i].objective)+(s[i].subjective);
     }
     
     for(j=0;j<n-1;j++)
        for(i=0;i<n-j-1;i++)
            if(s[i].sum<s[i+1].sum)
            {
                t=s[i];
                s[i]=s[i+1];
                s[i+1]=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");
}

 

 

六:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 80
#define M 5
typedef struct
{
   long int id; 
   char name[20];
   char banji[60];
}STU;
int main()
{
    int i,j; 
    STU x[N],ran[M];
    FILE *fin,*fout;
    fin = fopen("list.txt","r");
    
    if(fin == NULL) 
    { 
       printf("fail to open list.txt\n"); 
       return 1;
       }
       
    for(i=0;i<N;i++)
    {
       fscanf(fin, "%ld %s %s", &x[i].id, x[i].name, x[i].banji); 
    }
    
    fclose(fin);
    
    srand(time(0));   //初始化随机种子
    j = rand()%(80)+1;   //随机生成一个从1到80的随机数
    
    for(i=0;i<M;i++)
    {
        ran[i] = x[j];
        j = rand()%(80)+1;
    }
    
    fout = fopen("lucky.txt", "w"); 
    
    if(fout == NULL) 
    { 
       printf("fail to open file\n"); 
       return 1; 
       }
    
    for(i=0;i<M;i++) 
    {
       fprintf(fout, "%ld %s %s\n", ran[i].id, ran[i].name, ran[i].banji); 
       printf("%ld %s %s\n", ran[i].id, ran[i].name, ran[i].banji);
    }
    
    fclose(fout); 
    
    return 0;
}

 

 

posted @ 2022-06-05 21:14  夏吾吉  阅读(7)  评论(1编辑  收藏  举报