实验五

#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("datal.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;
               
                
               
     
}

#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("datal.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;
               
                
               
     
}

因为本身的表达形式就代表了地址符

#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.txt","wb");
        if(fp==NULL)
        {
            printf("fail to open file\n");
            return 1;
        }
        fwrite(x,sizeof(Book),N,fp);

        
        fclose(fp);
        return 0;
               
                
               
     
}

1.是

2.不能直观可见

#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.txt","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;
               
                
               
     
}

 

#include<stdio.h>

int main()
{
    FILE *fin;
    char ch;
    int count=0;
    
    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!='\n'&&ch!='    ')
            count++;
    }
    
    fclose(fin);
    printf("data3_1.txtÖй²°üº¬×Ö·ûÊý£º%d",count-1);
    
    return 0;
}

#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)
{
    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<time.h>
#include<string.h>

#define N 5

typedef struct
{
    long int id;
    char name[10];
    char clname[30];
}STU;

void pick(STU s[],int n);
void input(STU s[], int n);
void output(STU *s, int n);

int main()
{
    int i,k;
    STU stu[80],lucky[N];
    
    input(stu,80);
    
    srand(time(0));
    k=rand()%(80)+1;
    
    for(i=0;i<N;i++)
    {
        lucky[i]=stu[k];
        k=rand()%(80)+1;
    }
    
    output(lucky,N);
        
    
    
} 

void input(STU s[], int n)
{
    int i;
    FILE *fin;

    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", &s[i].id, s[i].name,s[i].clname);

    fclose(fin);
}

void output(STU s[], int n)
{
    int i;
    FILE *fout;

    fout = fopen("lucky.txt", "w");
    
    for (i=0;i<n;i++)
            printf("%ld\t%s\t%s\n", s[i].id, s[i].name,s[i].clname);
    
    if (fout == NULL)
    {
        printf("fail to create lucky.txt\n");
        return 1;
    }

    for (i = 0; i < n; i++)
        fprintf(fout, "%ld\t%s\t%s\n", s[i].id, s[i].name,s[i].clname);


    fclose(fout);
}