实验5
#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");
printf( "%-20s %-20s\n",x[i].name,x[i].author);
}
fclose(fp);
return 0;
}
1.因为数组的表现形式本身就代表其起始地址
#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;
}
#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","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;
}
1.成功生成
2.直观可见
#include<stdio.h>
int main()
{
int i;
FILE *fp;
fp=fopen("data3_2.txt","r");
fseek(fp,0L,SEEK_END);
i=ftell(fp);
printf("lengh of file is%d",i);
}
#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;
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);
count=findMinlist(stu,N,minlist);
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);
}
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;
min_score=s[0].score;
for(i=1;i<n;++i)
{
if(s[i].score<min_score)
min_score=s[i].score;
}
k=0;
for(i=0;i<n;++i)
{
if(s[i].score==min_score)
{
t[k]=s[i];
++k;
}
}
return k;
}
#define _CRT_SECURE_NO_WARNINGS
#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");
}
}
}
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<time.h>
#include<string.h>
#include<math.h>
#include<cstdlib>
#include<ctime>
#define N 5
typedef struct
{
long int id;
char name[10];
char clname[30];
}STU;
void pick(STU s[], int n);
int input(STU s[], int n);
int 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);
}
int 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);
}
int 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);
}
