实验五

Task1—1

#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;
}

 

Task1-2

#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;
}

 

Task2-1

#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 the file\n");
        return 1;
    }
    
    fwrite(x,sizeof(Book),N,fp);
    
    fclose(fp);
    
    return 0;
}

 

Task2-2

#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;
}

 

Task 3-2

#include <stdio.h>

int main()
{
    FILE *fp;
    char ch;
    int count=0;
    if((fp=fopen("data3_1.txt","r"))==NULL)
    {
        printf("fail to open data3_1.txt");
        return 1;
    }
    while(!feof(fp))
    {
        ch=fgetc(fp);
        if(ch!=' '&&ch!='\n'&&ch!='\t'&&ch!=EOF)
        {
            count++;
        }
        
    }
    printf("count=%d\n",count);
    fclose(fp);
    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;
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);
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;
     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");
}

 

Task6

#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;
}