实验5

 

 1.1

#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",x[i].name,x[i].author);
printf("%-20s %-20s\n",x[i].name,x[i].author);
}
fclose(fp);

return 0;

}

1.2

#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;
}

2.1

#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;
}

 

 

 2.2

 

#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;
}

3.

#include <stdio.h>
int main()
{
FILE *fin, *fout;
char ch;
fin = fopen("data3_1.txt", "r");
if(fin == NULL)
{
printf("fail to open data3_1.txt\n");
return 1;
}
fout = fopen("data3_2.txt", "w");
if(fout == NULL)
{
printf("fail to open data3_2.txt\n");
return 1;
}
while( !feof(fin) )
{
ch = fgetc(fin);
if(ch >= 'a' && ch <= 'z')
ch -= 32;fputc(ch, fout);

}

fclose(fin);
fclose(fout);
return 0;

}

4.

#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;

}

5.

#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);
// 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);
}
void process(STU s[], int n)

{
  // 补足代码
// ×××
}