实验7

task1_1

#include <stdio.h>
#define N 7
#define M 80

typedef struct{
    char name[M];
    char author[M];
} Book;

int main(){
    Book x[N] = {{"《雕塑家》","斯科特·麦克劳德"},
                 {"《灯塔》","克里斯多夫·夏布特"}, 
                 {"《五号屠宰场》","库尔特·马内古特"},
                 {"《出卖月亮的人》","罗伯特·海因莱因"},
                 {"《大地之上》","罗欣顿·米斯特里"},
                 {"《上学记》","何兆武"},
                 {"《命运》","蔡崇达"}};
    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);
    }
    
    fclose(fp);
    
    return 0;
}

task1_2

#include <stdio.h>
#define N 10
#define M 80

typedef struct {
    char name[M];   
    char author[M]; 
} Book;


int main() {
    Book x[N]; 
    int i, n;
    
    FILE *fp;

    fp = fopen("data1.txt", "r");
    
    if(fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    
    i = 0;
    while(!feof(fp)) {
        fscanf(fp, "%s%s", x[i].name, x[i].author);
        ++i;
    }
    n = i - 1;

    for(i = 0; i < n; ++i)
        printf("%d. %-20s%-20s\n", i+1, x[i].name, x[i].author);
    
    fclose(fp);
    
    return 0;
}

 task4

#include <stdlib.h>
#include <stdio.h>

int main()
{ FILE *fp;
   int i=0;
   char ch;
  fp=fopen("data4.txt","r");
 if(fp==NULL)
 {
     printf("fail to open\n");
    return 1;
 }
  while(!feof(fp))
  {ch=fgetc(fp);
  if(ch>33)
   i++;
  }
  fclose(fp);
  printf("共包含字符数%d",i);
  return 0 ;
} 

 task5

#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;
   STU p;
   for (i = 0;i < n; ++i)
   {
       s[i].sum=s[i].objective+s[i].subjective;
   }
   
    for(j=1;j<n;j++)
    {
        if(s[j-1].sum<s[j].sum)
        {
            p=s[j];
            s[j]=s[j-1];
            s[j-1]=p;
        }

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

 task6

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

typedef struct
{
    long int id;
    char name[N];
    char classname[N];
}STU;

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

int main()
{
    STU stu[N];
    input (stu, N);
    process (stu, N);
    return 0;
 } 
 
void input (STU s[], int n)
{
    int i;
    FILE *fin;
    fin = fopen("list.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 %s",&s[i].id,s[i].name,s[i].classname);}
    }
    fclose (fin);
}

void process (STU s[], int n)
{
    int b[5];
    int i;
    srand(time(NULL));
    for (i = 0;i < 5; ++i)
    {
        b[i] = rand()%80 + 1;
    }
    for(i=0;i<5;i++)
    {
        printf("%ld\t%s\t%s\n",s[b[i]].id,s[b[i]].name,s[b[i]].classname);
    }
    FILE *fout;   
    fout = fopen("lucky.txt","w");
    if(!fout)
    {
        printf("fail to open or creat lucky.txt\n");
        exit (0);
    } 
    for(i=0;i<5;i++)
    fprintf(fout,"%ld\t%s\t%s\n",s[b[i]].id,s[b[i]].name,s[b[i]].classname);
    
    fclose(fout); 
}