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实验五

作者：互联网

#include <stdio.h>
#define N 5
#define M 80
typedef struct
{
char name[M]; // 书名
char author[M]; // 作者
}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;
// 以写的方式打开文本文件data1.txt
fp = fopen("data1.txt", "w");
// 如果打开文件失败，输出提示信息并返回
if(fp == NULL)
{
printf("fail to open file\n");
return 1;
}
// 将结构体数组x中的图书信息写到fp指向的文件data1.txt
// 同时也输出到屏幕上
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.c//
//从文本文件data.1.txt中读取图书信息，并打印输出屏幕 
#include<stdio.h>
#define N 5
#define M 80

typedef struct
{
    char name[M];  //书名
    char author[M];//作者 
}Book;
int main()
{
    Book x[N];
    int i;
    FILE *fp;
    //以只读的方式打开文本data.1.txt
    fp = fopen("data1.txt","r");
    
    //如果打开文件失败，输出提示信息并返回
    if(fp==NULL)
    {
        printf("fail to open file\n");
        return 1;
     } 

//从fp 指向的文件data.1.txt中读取信息到结构体数组x
//同时，把x的内容输出到屏幕上

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;
 }

 

 

#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·茨格威"},
                {"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;
 }
#include <stdio.h> 
#define N 5 
#define M 80
typedef struct
{
    char name[M]; // 书名 
    char author[M]; // 作者
}Book;

int main()
{
    Book x[N];
    int i;
    
    FILE *fp;
    
    // 以读的方式打开二进制文件data2.dat 
    fp = fopen("data2.dat", "rb");
    
    // 如果打开文件失败，输出提示信息并返回
    if(fp == NULL)
    {
        printf("fail to open file\n"); 
        return 1;
    }
    
    // 从fp指向的文件中读取数据块到x对应的地址单元
    // 数据块大小为sizeof(Book)×N
    fread(x, sizeof(Book), N, fp);
    // 在屏幕上输出结构体数组x中保存的数据
    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, *fout; char ch; // 以只读、文本方式打开文件data3_1.txt 
fin = fopen("data3_1.txt", "r"); // 如果打开失败，输出提示信息并返回
 if(fin == NULL) 
 { printf("fail to open data3_1.txt\n");
  return 1;
   } // 以写、文本方式打开文件data3_2.txt 
 fout = fopen("data3_2.txt", "w"); // 如果打开失败，输出提示信息并返回 
  if(fout == NULL)
  { printf("fail to open data3_2.txt\n");
   return 1; }// 当fin指向的文件data1_txt没有结束时 
  while( !feof(fin) ) 
  { 
  // 从fin指向的文件data1_txt读取单个字符 
  ch = fgetc(fin); // 如果ch是小写字母，转换成大写 
  if(ch >= 'a' && ch <= 'z') ch -= 32; // 将字符变量ch中的字符写入fout指向的文件data3_2.txt 
  fputc(ch, fout); 
  }
  fclose(fin);
   fclose(fout); 
   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)
{
    int i,j,k;
    float Y,L;
    STU temp;
    for(i=0;i<n;i++)
        s[i].sum=s[i].objective+s[i].subjective;
    for(i=1;i<n;i++)
        for(j=0;j<i;j++)
        {
            if(s[i].sum>s[j].sum)
            {
                k=j;
                temp=s[i];
                for(j=i-1;j>=k;j--)
                    s[j+1]=s[j];
                s[k]=temp;
            }
        }
    Y=s[(int)(n*0.1-1)].sum;
    L=s[(int)(n*0.5-1)].sum;
    for(i=0;i<n;i++)
        if(s[i].sum>=Y)
            strcpy(s[i].level,"优秀");
        else if(s[i].sum>=L)
            strcpy(s[i].level,"合格");
        else
            strcpy(s[i].level,"不合格");
}

 

 

 

 

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define M 80
#define N 5
typedef struct
{
    long int id;
    char name[20];
    char classes[80];
    int target;
} STU;
void input(STU s[], int n);
void random(STU s[],STU lucky[],int m,int n);
void output(STU lucky[], int n);
int main()
{
    STU stu[M];
    STU lucky[N];
    input(stu, M);
    random(stu,lucky,M,N);
    output(lucky,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].classes);
    }
    fclose(fin);
}
void random(STU s[],STU lucky[],int m,int n)
{
    int k = 0;
    srand(time(NULL));
    while (k < n)
    {
        int i = rand()%m + 1;
        lucky[k] = s[i];
        k++;
    }
}
void output(STU lucky[], int n)
{
    for (int i = 0; i < 5; i++)
        printf("%ld\t%-10s %-10s\n", lucky[i].id, lucky[i].name, lucky[i].classes);
    FILE *fout;
    fout = fopen("lucky.txt", "w");
    for (int i = 0; i < n; i++)
        fprintf(fout, "%ld\t%-10s %-10s\n", lucky[i].id, lucky[i].name, lucky[i].classes);
    fclose(fout);
}

 

 

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define M 80
#define N 5
typedef struct
{
    long int id;
    char name[20];
    char classes[80];
    int target;
} STU;
void input(STU s[], int n);
void random(STU s[],STU lucky[],int m,int n);
void output(STU lucky[], int n);
int main()
{
    STU stu[M];
    STU lucky[N];
    input(stu, M);
    random(stu,lucky,M,N);
    output(lucky,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].classes);
    }
    fclose(fin);
}
void random(STU s[],STU lucky[],int m,int n)
{
    int x[m];
    int k = 0;
    srand(time(NULL));
    while (k < n)
    {
        int i = rand()%m + 1;
        if(x[i] == 1)
            continue;
        lucky[k] = s[i];
        x[i] = 1;
        k++;
    }
}
void output(STU lucky[], int n)
{
    for (int i = 0; i < 5; i++)
        printf("%ld\t%-10s %-10s\n", lucky[i].id, lucky[i].name, lucky[i].classes);
    FILE *fout;
    fout = fopen("lucky2.txt", "w");
    for (int i = 0; i < n; i++)
        fprintf(fout, "%ld\t%-10s %-10s\n", lucky[i].id, lucky[i].name, lucky[i].classes);
    fclose(fout);
}

 

标签：fp,int,lucky,STU,实验,txt,fin
来源： https://www.cnblogs.com/q1a2w/p/16350318.html