实验五

task1-1

#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;
}

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task1-2

#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;
}

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name和author已经是数组首地址,不用加地址符

task2-1

#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;
}

image

task2-2

#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;
}

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task3-2

#include <stdio.h>
int main()
{
int i=0;
FILE*fp;
char ch;
fp=fopen("data3_1.txt","r");
if(fp==NULL)
{
    printf("fail to find file\n");
    return 1;
}

while ((ch=fgetc(fp))!=EOF)
{
    if(ch!='\n'&&ch!=' '&&ch!='\t')
    i++;
}

printf("data3_1.txt中共包含字符数:%d",i);

fclose(fp);

return 0;
}

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task5

#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;

// 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;
}


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);


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)
{
int i,j;
STU t[10];
for (i = 0; i < n; i++)
{
    s[i].sum = s[i].subjective + s[i].objective;
}
for (j = 1; j < n * n / 2; j++)
{
    for (i = 0; i < n - 1; i++)
    {
        if (s[i].sum < s[i+1].sum)
        {
            t[i] = s[i];
            s[i] = s[i + 1];
            s[i + 1] = t[i];
        }

    }
}
i = 0;
while (i < n)
{
    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");
i++;
}
}

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task6

#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");

}

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posted @ 2022-06-07 00:04  王晶晶晶晶  阅读(15)  评论(2编辑  收藏  举报