标签：fp name int STU 实验 printf fin
#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;
}
#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;
}
#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;
}
1.生成data2.dat
2.不直观可见
#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;
char ch;
int count=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!=' '&&ch!='\n'&&ch!=' ')
count++;
}
fclose(fin);
printf("data3_1.txt中共包含字符数：%d",count-1);
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)
{
STU temp;int i,j;
for(i=0;i<n;i++)
{
s[i].sum=s[i].objective+s[i].subjective;
}
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
if(s[i].sum>s[j].sum)
{
temp.id=s[i].id;
s[i].id=s[j].id;
s[j].id=temp.id;
strcpy(temp.name,s[j].name);
strcpy(s[j].name,s[i].name);
strcpy(s[i].name,temp.name);
temp.objective=s[i].objective;
s[i].objective=s[j].objective;
s[j].objective=temp.objective;
temp.subjective=s[i].subjective;
s[i].subjective=s[j].subjective;
s[j].subjective=temp.subjective;
temp.sum=s[i].sum;
s[i].sum=s[j].sum;
s[j].sum=temp.sum;
}
}
}
for(i=0;i<n;i++)
{
if(i+1<=n*0.1)
{
strcpy(s[i].level,"优秀");
}
else if(i<=n*0.5)
{
strcpy(s[i].level,"合格");
}
else
{
strcpy(s[i].level,"不合格");
}
}
}
#include<stdio.h>
#include<time.h>
#include<string.h>
#define N 5
typedef struct
{
long int id;
char name[10];
char clname[30];
}STU;
void pick(STU s[],int n);
void input(STU s[], int n);
void output(STU *s, int n);
int main()
{
int i,k;
STU stu[80],lucky[N];
input(stu,80);
srand(time(0));
k=rand()%(80)+1;
for(i=0;i<N;i++)
{
lucky[i]=stu[k];
k=rand()%(80)+1;
}
output(lucky,N);
}
void input(STU s[], int n)
{
int i;
FILE *fin;
fin = fopen("list.txt", "r");
if (fin == NULL)
{
printf("fail to open list.txt\n");
return 1;
}
for (i = 0; i < n; i++)
fscanf(fin, "%ld %s %s", &s[i].id, s[i].name,s[i].clname);
fclose(fin);
}
void output(STU s[], int n)
{
int i;
FILE *fout;
fout = fopen("lucky.txt", "w");
for (i=0;i<n;i++)
printf("%ld\t%s\t%s\n", s[i].id, s[i].name,s[i].clname);
if (fout == NULL)
{
printf("fail to create lucky.txt\n");
return 1;
}
for (i = 0; i < n; i++)
fprintf(fout, "%ld\t%s\t%s\n", s[i].id, s[i].name,s[i].clname);
fclose(fout);
}
标签：fp,name,int,STU,实验,printf,fin 来源： https://www.cnblogs.com/kowo/p/16349980.html
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