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第五次实践

作者:互联网

#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;
// 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;
}

#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;
// 以读的方式打开文本文件data1.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data1.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;
}

因为引号内是%s,所以x[i].name,x[i].author的字符串形式就为地址
#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;
// 以写的方式打开二进制文件data2.dat
fp = fopen("data2.dat", "wb");
// 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中的图书信息写以数据块方式写入文件
// 把从地址x处开始sizeof(Book)×N个字节大小的数据块写入fp指向的文件
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>
#include<stdlib.h>
int main()
{
FILE *fin;
char ch;
fin = fopen("data3_1.txt", "r");
if(fin == NULL)
{
printf("fail to open data3_1.txt\n");
return 1;
}
int s=0;
while( (ch=fgetc(fin)) !=EOF)
{
if((ch>=33&&ch<=126))
{
s++;
}
}
printf("%d",s);
return 0;
}

#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;
    STU t;
FILE *fin;
fin = fopen("examinee.txt", "r");
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);
}
for(i=0;i<n;i++)
{ 
s[i].sum=s[i].objective+s[i].subjective;
} 
    for(i=0;i<n;i++)
    {
        for(j=i;j<n;j++)
        {
            if(s[i].sum<s[j].sum)
            {
                t=s[i];
                s[i]=s[j];
                s[j]=t;
            }
        }
    }
    for(i=0;i<n;i++)
    {
        if (i == 0)
            strcpy(s[i].level, "优秀");
        else if (i >= 1 && i <= 4)
            strcpy(s[i].level, "合格");
        else
            strcpy(s[i].level, "不合格");
    }

}

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 5
#define M 80
typedef struct
{
    char xuehao[20];
    char name[20];
    char classm[20];
}lucky;

int main()
{
    int i, j;
    lucky s[M];
    FILE* fin;
    FILE* fout;
    
    srand(time(0));
    
    fin = fopen("list.txt", "r");
    if (fin == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    
    for (i = 0; i < M; i++)
    {
        fscanf(fin, "%s %s %s\n", s[i].xuehao, s[i].name, s[i].classm);
    }

    fout = fopen("lucky.txt", "w");
    if (fout == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    
    for (i = 0; i < N; i++)
    {
        j = rand()%(80)+1; 
        printf("%-20s %-20s %-20s\n", s[j].xuehao, s[j].name, s[j].classm);
        fprintf(fout, "%-20s %-20s %-20s\n", s[j].xuehao, s[j].name, s[i].classm);
    }
    fclose(fin);
    fclose(fout);
    system("pause");

}

 

标签:fp,int,实践,char,第五次,Book,include,define
来源: https://www.cnblogs.com/Alizex7/p/16350238.html