实验7

任务4

源代码

#include <stdio.h>

void func1();
void func2();

int main()
{
    printf("data4.txt统计结果\n");
    func1();
    func2();
    return 0;
}
//统计行数
void func1()
{
    int cnt = 1;
    char ch;
    FILE* fp;
    fp = fopen("data4.txt", "r");
    if (!fp)
    {
        printf("fail to open file to read");
        return;
    }
    while (!feof(fp))
    {
        ch = fgetc(fp);
        //if (ch == EOF)
        //    break;
        if (ch == '\n')
            cnt++;
    }
    printf("%-20s%d\n", "行数:", cnt);
}
//统计字数
void func2()
{
    int cnt = 0;
    char ch;
    FILE* fp;
    fp = fopen("data4.txt", "r");
    if (!fp)
    {
        printf("fail to open file to read");
        return;
    }
    while (!feof(fp))
    {
        ch = fgetc(fp);
        if (ch  == EOF)
            break;
        if (ch!=' '&&ch!='\n'&&ch!='\t')
            cnt += 1;
        

    }
    printf("%-20s%d\n", "字符数(不计空白符)", cnt);
}

运行结果

 

任务5

源代码

#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_pass.txt", "w");
    if (!fp)
        printf("fail to open file to write");
    for (i = 0; i < n; i++)
        fprintf(fp, "%-10d%-10s\t%-10.0f%-10.0f%-10.0f%-15s\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 i;
    int cnt = 0;
    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;
}

运行图片

 

任务6

源代码

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#define N 50
#define M 100
#define NUM 20
typedef struct stu
{
    int id;
    char name[N];
    char class[N];
}STU;
void read(STU st[]);
void pick(int x[]);
void output(int x[], STU st[]);
void save(int x[], STU st[], char target[]);


int main()
{
    int i = 0;
    int x[NUM];//保存抽到的序号
    char target_file[50];
    char end[] = ".txt";
    STU members[M];
    read(members);
    pick(x);
    printf("----------随机抽点名单----------\n");
    output(x,members);
    printf("----------保存到文件----------\n");
    //获取当前日期
    time_t current_time;
    struct tm* local_time;
    current_time = time(NULL);
    local_time = localtime(&current_time);
    strftime(target_file, sizeof(target_file), "%Y %m %d %A %H %M %S.txt", local_time);
    save(x, members, target_file);
    printf("已成功保存至%s",target_file);
    return 0;    
}

void read(STU st[])
{
    int i = 0;
    int num;
    FILE *fp;
    fp = fopen("list.txt", "r");
    if (!fp)
        printf("fail to open file to read");
    while (!feof(fp))
    {
        num = fscanf(fp, "%d%s%s", &st[i].id,st[i].name,st[i].class);
        if (num != 3)
            break;
        i++;
    }
    fclose(fp);
}

void pick(int x[])
{
    int i = 0;
    int j;
    int jug;
    int random_num;
    do
    {
        jug = 1;
        srand((unsigned int)time(NULL));
        random_num = rand()%80;
        for (j = 0; j < i; j++)
        {
            if (x[j] == random_num)
                jug = 0;
        }
        if (jug == 0)
            continue;
        x[i] = random_num;
        i++;
    } while (i != NUM);
}
void output(int x[],STU st[])
{
    int i;
    for (i = 0; i < NUM; i++)
    {
        printf("%-20d%-20s%-40s\n", st[x[i]].id, st[x[i]].name, st[x[i]].class);
    }
}
void save(int x[], STU st[], char target[])
{
    int i;
    FILE *fp;
    fp = fopen(target, "w");
    for (i = 0; i < NUM; i++)
    {
        fprintf(fp, "%-20d%-20s%-40s\n", st[x[i]].id, st[x[i]].name, st[x[i]].class);
    }
    fclose(fp);
}

运行结果