上机实验五

本文主要是介绍上机实验五，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

task 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;
}

task 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;
}

task 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;
}

task 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;
}

task 3

#include <stdio.h>
int main()
{
  FILE *fin;
  char ch;
  int i=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!='\0' && ch!=' ' && ch!='\t')
    i=i+1;
 }
 
   fclose(fin);
   
   printf("data3-1.txt中共包含字符数：%d",i);
   
   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;


// 函数声明
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;
}


// 从文本文件examinee.txt读入考生信息:准考证号，姓名，客观题得分，操作题得分
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);
}


//输出考生完整信息: 准考证号，姓名，客观题得分，操作题得分，总分，等级
// 不仅输出到屏幕上，还写到文本文件result.txt中
void output(STU s[], int n)
{
  FILE *fout;
  int i;
  
// 输出到屏幕
   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);
       
// 保存到文件
  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);
}

// 对考生信息进行处理：计算总分，排序，确定等级
void process(STU s[], int n)
{
    int i,j,k;
    STU temp;
    
    for(i=0;i<n;++i)
    s[i].sum=s[i].objective+s[i].subjective;
    
    for(i=0;i<n;i++)
    {
        for(k=0;k<n-1-i;k++)
        {
            if(s[k].sum<s[k+1].sum)
            {
                temp=s[k];
                s[k]=s[k+1];
                s[k+1]=temp;
            
            }
        }
    }
    
    
     j = n/10;
   for(i=0;i<j;i++)
   {
          strcpy(s[i].level,"优秀"); 
   }
   
  
   k = n/2;
   for(i=j;i<k;++i)
   {
          strcpy(s[i].level,"合格"); 
   }
   
    
   for(i=k;i<n;i++)
   {
          strcpy(s[i].level,"不合格");
   }
   
}

task 6

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 81
#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=1;i<=N;i++)
    {
       fscanf(fin, "%ld %s %s", &x[i].id, x[i].name, x[i].banji); 
    }
    
    fclose(fin);
    
    srand(time(0));
    j = rand()%(80)+1; 
      
    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;
}

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