第五次作业

#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;
}
输入的是字符串，不用加地址符

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;
// 以读的方式打开文本文件data1.txt
fp = fopen("data1.txt", "r");
// 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;
}
// 从fp指向的文件data1.txt中读取信息到结构体数组x
// 同时，把x的内容输出到屏幕上
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>
int main()
{
FILE *fin, *fout;
char ch;
// 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;
}
// 以写、文本方式打开文件data3_2.txt
fout = fopen("data3_2.txt", "w");
// 如果打开失败，输出提示信息并返回
if (fout ==NULL)
{
printf("fail to open data3_2.txt\n");
return 1;
}
// 当fin指向的文件data1_txt没有结束时
while( !feof(fin) )
{
// 从fin指向的文件data1_txt读取单个字符
ch = fgetc(fin);
// 如果ch是小写字母，转换成大写
if(ch >= 'a' && ch <= 'z')
ch -= 32;
// 将字符变量ch中的字符写入fout指向的文件data3_2.txt
fputc(ch, fout);
}
fclose(fin);
fclose(fout);
return 0;
}

#include <stdio.h>
int main()
{
FILE *fin, *fout;
char ch;
int as=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;
}

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!=' '&&ch!='\n'&&ch!='\t')
{
    as+=1;
}

fputc(ch, fout);
}
fclose(fin);
fclose(fout);
printf("date_31,txt总共包含字符数:%d",as);
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;
}A

#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;
STU temp;
for(i=0;i<n;i++)
{
s[i].sum=s[i].objective*4/10+s[i].subjective*6/10;
}
for(i=0;i<n-1;i++)
{
    for(j=0;j<n-i-1;j++)
    {
        if(s[j].sum<s[j+1].sum)
        {
            temp=s[j];
            s[j]=s[j+1];
            s[j+1]=temp;
        }
    }
}
i=1;
for(i=1;i<=10;i++)
{
    switch(i)
{
    case 1:

        strcpy(s[i].level,"优秀");
        break;
    case 2:
        strcpy(s[i].level,"合格");
        break;
    case 3:
        strcpy(s[i].level,"合格");
        break;
    case 4:
        strcpy(s[i].level,"合格");
        break;
    case 5:
        strcpy(s[i].level,"合格");
        break;
    case 6:

        strcpy(s[i].level,"不合格");
        break;
    case 7:
        strcpy(s[i].level,"不合格");
        break;
    case 8:
        strcpy(s[i].level,"不合格");
        break;
    case 9:
        strcpy(s[i].level,"不合格");
        break;
    case 10:
        strcpy(s[i].level,"不合格");
        break;

}
}
}

#include<time.h>
#include<stdio.h>
#include<stdlib.h>
struct stu
{
    long int hao;
    char s[20];
    char l[100];
};
int main()
{
    struct stu std[80];
    srand(time(0));
    FILE *fp,*f;
    fp=fopen("list.txt","r");
    f=fopen("lucky.txt","w+");
    int i,sjs,j,y=0,x;
    for(i=0;i<80;i++)
    { fscanf(fp,"%ld %s %s",&std[i].hao,std[i].s,std[i].l);}
    for(j=0;j<5;j++)
    {
        sjs=rand()%80;
        if(sjs==y) break;
        y=sjs;
        for(i=0;i<80;i++)
        {
            x=std[i].hao%100;
            if(sjs==x)
            { printf("%-20d %-20s %-20s\n",std[i].hao,std[i].s,std[i].l);fprintf(f,"%ld %s %s\n",&std[i].hao,std[i].s,std[i].l);
            }
        }
    }
    fclose(fp);
    fclose(f);
    return 0;
}