实验7

任务4

#include <stdio.h>

void my_print()
{
    FILE *fp;
    fp = fopen("data4.txt", "r");
    char a;
    
    if (fp == NULL)
    {
        printf("fail to open file to read\n");
        return;
    }
    
    int count_line = 1;
    int count_only_char = 0;
    
    while ((a = fgetc(fp))! = EOF)    
    {
        if (a == '\n')
        count_line += 1;
        if (a != ' ' && a != '\n')
        count_only_char += 1;
    }
    printf("行数: %d\n字符数(不计空白符): %d\n", count_line, count_only_char);
    
    fclose(fp);
}

int main()
{
    printf("data4.txt统计结果\n");
    my_print();
    return 0;
}

 

 

任务5

#include <stdio.h>
#include <string.h>

#define N 10

typedef struct 
{
    long id;            // 准考证号
    char name[20];      // 姓名
    float objective;    // 客观题得分
    float subjective;   // 操作题得分
    float sum;          // 总分
    char result[10];    // 考试结果
} STU;

// 函数声明
void read(STU st[], int n);
void write(STU st[], int n);
void output(STU st[], int n);
int process(STU st[], int n, STU st_pass[]);

int main() 
{
    STU stu[N], stu_pass[N];
    int cnt;
    double pass_rate;

    printf("从文件读入%d个考生信息...\n", N);
    read(stu, N);

    printf("\n对考生成绩进行统计...\n");
    cnt = process(stu, N, stu_pass);

    printf("\n通过考试的名单:\n");
    output(stu, N);   // 输出所有考生完整信息到屏幕
    write(stu, N);    // 输出考试通过的考生信息到文件

    pass_rate = 1.0 * cnt / N;
    printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100);

    return 0;
}

// 把所有考生完整信息输出到屏幕上
// 准考证号，姓名，客观题得分，操作题得分，总分，结果
void output(STU st[], int n) 
{
    int i;
    
    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结果\n");
    for (i = 0; i < n; i++)
        printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].result);
}

// 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 read(STU st[], int n) 
{
    int i;
    FILE *fin;

    fin = fopen("examinee.txt", "r");
    if (!fin) 
    {
        printf("fail to open file\n");
        return;
    }

    while (!feof(fin)) 
    {
        for (i = 0; i < n; i++)
            fscanf(fin, "%ld %s %f %f", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective);
    }

    fclose(fin);
}

// 把通过考试的考生完整信息写入文件list_pass.txt
// 准考证号，姓名，客观题得分，操作题得分，总分，结果
void write(STU s[], int n) 
{
    int i;
    FILE *fp;
    fp = fopen("list.txt", "w");
    if (fp == NULL)
    {
        printf("fail to open file to write\n");
        return;
    }
    
    fprintf(fp, "准考证号\t姓名\t客观题得分\t操作题得分\t总分\t\t结果\n");
    
    for (i = 0; i < n; i++)
    {
        if (s[i].sum >= 60)
        {
            fprintf(fp, "%ld%10s%10.2f%10.2f%10.2f%10s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);
        }
    }
    
    fclose(fp);
}
// 对考生信息进行处理：计算每位考生考试总分、结果；统计考试通过的人数
int process(STU st[], int n, STU st_pass[]) 
{
    int cnt = 0;
    int i;
    
    for (i = 0; i < n; i++)
    {
        st[i].sum = st[i].objective + st[i].subjective;
        
        if (st[i].sum >= 60)
        {
            strcpy(st[i].result, "通过");
            cnt++; 
        }
        else 
        strcpy(st[i].result, "不通过");
    }

    return cnt;
}

 

 

任务6

 

#include <stdio.h>
#include <time.h>
#define a 10
#define b 100
#define c 100

typedef struct
{
    int number;
    char name[b];
    char class[c];
    int flag;
} STU;

void read(STU s[])
{
    int i;
    FILE *fp;

    fp = fopen("list.txt", "r");
    if (!fp) 
    {
        printf("fail to open file to read\n");
        return;
    }
    
    while (!feof(fp)) 
    {
        for (i = 0; i < 80; i++)
            fscanf(fp, "%s%s%s", &s[i].number, &s[i].name, &s[i].class);
    }

    fclose(fp);
}

void select(STU s[])
{
    int i, random;
    srand (time (NULL));
    
    for (i = 0; i < 5; i++)
    {
        do
        {
            random = rand() % 80;
        }while (s[random].flag == 1);
        
        s[random].flag = 1;
        s[i] = s[random];
    }
}
void store(STU s[], char *student)
{
    FILE *fp;
    int i;
    fp = fopen("student.txt", "w");
    if (! fp)
    {
        printf("fail to open file to write\n");
        return;
    }
    for (i = 0; i < 5; i++)
    {
        fprintf(fp,"%-16d%-8s%s\n",s[i].number,s[i].name,s[i].class);
    }
    
    fclose(fp);
}

int main()
{
    STU s[80];
    char student[100];
    int i;
    for (i = 0; i < 80; i++)
    s[i].flag = 0;
    
    printf("------------20241222抽点名单------------\n");
    read(s);
    select(s);
    
    for (i = 0; i < 5; i++)
    printf("%-16d%-8s%s\n",s[i].number,s[i].name,s[i].class);
    
    printf("------------保存到文件-----------\n");
    printf("输入文件名:");
    gets(student);
    printf("\n");
     
    store(s,student);
    printf("保存成功！");
     
    return 0;
}