实验5

1-1

#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;
}

1-2

#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;
}

2-1

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

2-2

#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;
}

3-1

#include<stdio.h>
#define M 40
int main()
{char x[M];
int sum=0;
int i;
    FILE *fin;
    char ch;
    
    fin=fopen("data3_1.txt","r");
    
    if(fin==NULL)
    {
        printf("fail to open data3_1.txt\n");
        return 1;
    }
    
    
    
    while (!feof(fin))
    {
        x[M]=fgetc(fin);
        
        for(i=0;i<M;i++)
        if(x[i]!=' ')++sum;
        printf("data3_1.txt中共包含字符数：%d",sum);
    
        return 0;
    
    }
    fclose(fin);

    
    return 0;
}

3-2

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
    FILE* fin;
    char ch;
    int s = 0;

    fin = fopen("data3_1.txt", "r");

    

    while ((ch=fgetc(fin))!=EOF)
    {
        

        if (ch != ' ' && ch != '\n' && ch != '\b')
            s++;

            
    }
    printf("%d", s);
    fclose(fin);
        return 0;
}

5

#define _CRT_SECURE_NO_WARNINGS
#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);

    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;
    for (i = 0; i < n; i++)
        s[i].sum = s[i].objective  + s[i].subjective ;

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

 6

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

typedef struct
{
    long no;
    char name[20];
    char class[80];
}STU;
int main()
{
    int i, j;
    STU x[N], lucky[M];
    FILE* fin,* fout;
    fin = fopen("list.txt", "r");
    if (fin == NULL)
    {
        printf("fail to open file\n");
        exit(0);
    }
    for (i = 0; i < N; i++)
    {
        fscanf(fin, "%ld %s %s", &x[i].no, x[i].name, x[i].class);
    }
    fclose(fin);
    srand(time(0));
    for (i = 0; i < M; i++)
    {
        j = rand() % 80;
        lucky[i] = x[j];
    }
    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", lucky[i].no, lucky[i].name, lucky[i].class);
        printf("%ld %s %s\n", lucky[i].no, lucky[i].name, lucky[i].class);
    }
    fclose(fout);
    return 0;
}