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];
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()
{
    FILE *fin,*fout;
    char ch;
    
    fin =fopen("data3_1.txt","r");
    if(fin==NULL)
    {
        printf("fail to open data3_1.txt\n");
        return 1;
    }
    
    fout=fopen("data3_2.txt","w");
    if(fout==NULL)
    {
        printf("fail to open data3_2.txt\n");
        return 1;
    }
    
    while(!feof(fin))
    {
        ch=fgetc(fin);
        
        if(ch>='a'&&ch<='z')
            ch-=32;
        
        fputc(ch,fout);
    }
    
    fclose(fin);
    fclose(fout);
    
    return 0;
}

 

#include<stdio.h>
#define N 5

typedef struct
{
    long no;
    char name[20];
    int score;
}STU;

int findMinlist(STU s[],int n,STU t[]);

int main()
{
    STU stu[N],minlist[N];
    int count,i;
    FILE *fin,*fout;
    
    fin=fopen("data4_1.txt","r");
    if(fin==NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    
    for(i=0;i<N;++i)
    {
        fscanf(fin,"%ld %s %d",&stu[i].no,stu[i].name,&stu[i].score);
        printf("%ld %s %d\n",stu[i].no,stu[i].name,stu[i].score);
    }
    fclose(fin);
    
    count=findMinlist(stu,N,minlist);
    
    printf("\n一共有%d个最低分，信息如下：\n",count);
    for(i=0;i<count;++i)
    {
        printf("%ld %s %d\n",minlist[i].no,minlist[i].name,minlist[i].score);
    }
    
    fout=fopen("data4_2.txt","w");
    if(fout==NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    
    for(i=0;i<count;++i)
    {
        fprintf(fout,"%ld %s %d\n",minlist[i].no,minlist[i].name,minlist[i].score);
    }
    fclose(fout);
    
    return 0;
}

int findMinlist(STU  s[],int n,STU t[])
{
    int i,k,min_score;
    
    min_score=s[0].score;
    
    for(i=1;i<n;++i)
    {
        if(s[i].score<min_score)
            min_score=s[i].score;
    }
    
    k=0;
    for(i=0;i<n;++i)
    {
        if(s[i].score==min_score)
        {
            t[k]=s[i];
            ++k;
        }
    }
    return k;
}

#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;
    
    for(i=0;i<n;i++)
    {
        s[i].sum=s[i].objective+s[i].subjective;
    }
    
    for(i=0;i<n;i++)
    {
        for(j=0;j<n;j++)
        {
                if(s[i].sum>s[j].sum)
        {
            temp.id=s[i].id;
            s[i].id=s[j].id;
            s[j].id=temp.id;
            
            strcpy(temp.name,s[j].name);
            strcpy(s[j].name,s[i].name);
            strcpy(s[i].name,temp.name);
            
            temp.objective=s[i].objective;
            s[i].objective=s[j].objective;
            s[j].objective=temp.objective;
            
            temp.subjective=s[i].subjective;
            s[i].subjective=s[j].subjective;
            s[j].subjective=temp.subjective;
            
            temp.sum=s[i].sum;
            s[i].sum=s[j].sum;
            s[j].sum=temp.sum;
        }
        }
    }

    for(i=0;i<n;i++)
    {
        if(i+1<=n*0.1)
        {
            strcpy(s[i].level,"优秀"); 
        }
        else if(i<=n*0.5)
        {
            strcpy(s[i].level,"合格");
        } 
        else
        {
            strcpy(s[i].level,"不合格");
        }
    }
}

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 5
#define M 80
typedef struct
{
    char xuehao[20];
    char name[20];
    char classm[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].xuehao, s[i].name, s[i].classm);
    }

    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)+1; 
        printf("%-20s %-20s %-20s\n", s[j].xuehao, s[j].name, s[j].classm);
        fprintf(fout, "%-20s %-20s %-20s\n", s[j].xuehao, s[j].name, s[i].classm);
    }
    fclose(fin);
    fclose(fout);
    system("pause");

}