#include <stdio.h>
#define N 5
#define M 80
typedef struct
{
char name[M];//书名
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"},
{"历历十五年","黄仁宇"},
{"一只特立独行的猪","王小波"}};
int i;
FILE *fp;
//打开文本文件date1.txt
fp=fopen("deta1.txt","w");
//打开失败输出信息并返回
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(fp,"%-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;
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;}
#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];
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;
}
#include <stdio.h>
int main()
{
FILE *fin, *fout;
char ch;
fin=fopen("data3_1.txt","r");
if(fin==NULL)
{
printf("fail to open date3_1.txt\n");
return 1;
}
fout=fopen("date3_2.txt","w");
if(fin==NULL)
{
printf("fail to open date3_2.txt\n");
return 1;
}
while(!feof(fin))
{
ch=fgetc(fin);//fin指向的文件1_txt读取单个字符
if(ch>='a'&&ch<='z')
ch-=32;//如果是小写的字母换成大写
fputc(ch,fout);
}
fclose(fin);
fclose(fout);
return 0;
}
#include <stdio.h>
#define N 5
typedef struct
{
long no;
char name[20];
int score;
} STU;
int findMinlist(STU s[], int n, STU t[]);
int main()
{
STU stu[N], minlist[N];
int count, i;
FILE *fin, *fout;
// 从文件中读取学生数据到结构体数组stu中，并在屏幕上打印输出
fin = fopen("data4_1.txt", "r");
if(fin == NULL)
{
printf("fail to open file\n");
return 1;
}
for(i=0; i<N; ++i)
{
fscanf(fin, "%ld %s %d", &stu[i].no, stu[i].name, &stu[i].score);
printf("%ld %s %d\n", stu[i].no, stu[i].name, stu[i].score);
}
fclose(fin);
// 查找最低分学生信息并统计最低分学生人数
count = findMinlist(stu, N, minlist);
// 将最低分学生信息在屏幕上打印输出
printf("\n一共有%d个最低分,信息如下: \n", count);
for(i=0; i<count; ++i)
printf("%ld %s %d\n", minlist[i].no, minlist[i].name,
minlist[i].score);
// 将最低分学生信息写入文件data4_2.txt
fout = fopen("data4_2.txt", "w");
if(fout == NULL)
{
printf("fail to open file\n");
return 1;
}
for(i=0; i<count; ++i)
fprintf(fout, "%ld %s %d\n", minlist[i].no, minlist[i].name,
minlist[i].score);
fclose(fout);
return 0;
}
int findMinlist(STU s[], int n, STU t[])
{
int i, k, min_score;
// 找最低分
min_score = s[0].score;
for(i=1; i<n; ++i)
if(s[i].score < min_score)
min_score = s[i].score;
// 统计最低分人数，把最低分学生信息保存到数组t
k = 0;
for(i=0; i<n; ++i)
if(s[i].score == min_score)
{
t[k] = s[i];
++k;
}
return k;
}
#include <stdio.h>
int main()
{
FILE *fin;
char ch;
int i=0;
// 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;
}
while(!feof(fin))
{ch=fgetc(fin);
if(ch!=NULL&&ch!=' '&&ch!='\n'&&ch!='\0'&&ch!='\t')
i++;
}
printf("date3.1txt中共包含字符数：%d",i);
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;
int t,min;
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)
{t=s[j].sum;
s[j].sum=s[j+1].sum;
s[j+1].sum=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<string.h>
#include<stdlib.h>
#define N 80
typedef struct
{ long int xuehao;
char name[20];
char grade[80];
}STU;
int main()
{
STU s[80];
STU a[5];
int i;
FILE *fp1,*fp2;
fp1 = fopen("list.txt", "r");
fp2=fopen("lucky.txt","w+");
if (fp1 == NULL)
{
printf("fail to open file\n");
exit(0);
}
for(i=0;i<N;i++)
fscanf(fp1,"%d %s %s",&s[i].xuehao,s[i].name,s[i].grade);
for(i=0;i<5;i++)
{
int t;
t=rand()%80;
printf("%-20d %-20s %-20s\n",s[t].xuehao,s[t].name,s[t].grade);
fprintf(fp2,"%-20d %-20s %-20s\n",a[t].xuehao,a[t].name,a[t].grade);
}
fclose(fp1);
fclose(fp2);
return 0;
}
