实验五

task1_1.c

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

 

task1_2.c

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

因为x[i].name和x[i].author是字符串

 

task2_1.c

#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;
}

是，是

task2_2.c

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

task3_2.c

#include<stdio.h>

int main()
{
    FILE *fin;
    char ch;
    int n=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!='\r'&&ch!='t'&&ch!=' ')
            n++;
    }
    printf("data3_1.txt中共包含字符数：%d\n",n);
    fclose(fin);
    return 0;
}

task5.c

#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\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("%5ld\t%-10s\t%5.2f\t\t%5.2f\t\t%5.2f\t%-10s\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姓名\t客观题得分\t\t操作题得分\t\t总分\t等级\n");
    
    for(i=0;i<n;i++)
        fprintf(fout,"%-5ld\t%-10s\t%5.2f\t\t%5.2f\t\t%5.2f\t%-10s\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,k=n;
    for(i=0;i<n;i++)
        s[i].sum=s[i].objective+s[i].subjective;
    for(i=0;i<n-1;i++)
        for(j=0;j<n-i-1;j++)
            if(s[j].sum<s[j+1].sum)
            {
                s[k]=s[j];
                s[j]=s[j+1];
                s[j+1]=s[k];
            }
    for(i=0;i<n;i++)
    {
        if(i<n*(0.1))
            strcpy(s[i].level,"优秀");
        else if(i>=n*(0.1)&&i<n*(0.5))
            strcpy(s[i].level,"合格");
        else
            strcpy(s[i].level,"不合格");
    }
            
}

 

task6.c

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

typedef struct
{
    long no;
    char name[80];
    char class[80];
}STU;

void process(STU s[],int n,int m,STU t[]);

int main()
{
    STU stu[M],randlist[N];
    int i;
    FILE *fin,*fout;
    
    fin=fopen("list.txt","r");
    
    if(fin==NULL)
    {
        printf("fail to open list.txt\n");
        return 1;
    }
    
    while(!feof(fin))
    {
        for(i=0;i<M;i++)
            fscanf(fin,"%ld %s %s",&stu[i].no,stu[i].name,stu[i].class);
    }
    fclose(fin);
    
    process(stu,N,M,randlist);
    
    for(i=0;i<N;i++)
        printf("%ld\t%-10s\t\t%10s\n",randlist[i].no,randlist[i].name,randlist[i].class);
    
    fout=fopen("lucky.txt","w");
    
    if(fout==NULL)
    {
        printf("fail to open lucky.txt\n");
        return 1;
    }
    
    for(i=0;i<N;i++)
        fprintf(fout,"%ld\t%-10s\t\t%10s\n",randlist[i].no,randlist[i].name,randlist[i].class);
    
        fclose(fout);
        return 0;
    
}
    
void process(STU s[],int n,int m,STU t[])
{
    int i,j,k=0;
    
    srand((int)time(0));
    
    for(i=0;i<n;i++)
    {
        j=rand()%80;
        t[k]=s[j];
        ++k;
    }
}