实验七

实  验  4

#define  _CRT_SECURE_NO_WARNINGS
 #include <stdio.h>
int main()
{
    FILE* fp;
    fp = fopen("data4.txt", "r");
    if (!fp)
    {
        printf("fail to open\n");
        return 0;

    }
    int line = 1;
    int count = 0;
    int a;
    while ((a = fgetc(fp)) != EOF)
    {
        if (a == '\n')
            line++;
        else if (a != ' ' && a != '\t')
            count++;

    }
    fclose(fp);
    printf("data4.txt统计结果：\n");
    printf("行数：%d\n", line);
    printf("字符数：%d\n", count);
    return 0;
}

 实  验  5

#define  _CRT_SECURE_NO_WARNINGS
#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;
    }

    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)
{
    FILE* fin;
    fin = fopen("C:\\Users\\szh07\\Desktop\\list_pass.txt", "w");
    if (fin == NULL)
        return -1;
    int i = 0;
    fprintf(fin, "准考证号\t姓名\t客观题分\t操作题得分\t总分\t结果\n");
    for (i = 0; i < n; i++)
    {

        fprintf(fin, "%ld\t%s\t%.2f\t%.2f\t%.2f\t%s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);
    }
    fclose(fin);
}

// 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 = 0, count = 0;
    for (i = 0; i < n; i++)
    {
        st[i].sum = st[i].objective + st[i].subjective;
        if (st[i].sum >= 60.0)
        {
            strcpy(st[i].result, "通过");
            st_pass[count++] = st[i];
        }
        else
        {
            strcpy(st[i].result, "不通过");
        }
    }
    return count;
}

 实  验  6

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <windows.h>

#define N 80
#define M 5
#define L 100

typedef struct {
    long id;
    char name[20];
    char c[30];
} S;

int cmp(const void* a, const void* b) {
    S* sA = (S*)a;
    S* sB = (S*)b;
    return (sA->id - sB->id);
}

int read(S a[]) {
    FILE* f = fopen("C:\\Users\\szh07\\Desktop\\list.txt", "r");
    if (!f) {
        printf("Cannot open list.txt!\n");
        return -1;
    }

    int i = 0;
    char l[L];
    while (fgets(l, L, f) && i < N) {
        sscanf(l, "%ld %s %[^\n]", &a[i].id, a[i].name, a[i].c);
        i++;
    }
    fclose(f);
    return i;
}

void rand_sel(S a[], int b, S c[]) {
    int f[N] = { 0 };
    int i = 0;
    srand((unsigned int)time(NULL));

    while (i < M) {
        int d = rand() % b;
        if (!f[d]) {
            c[i++] = a[d];
            f[d] = 1;
        }
    }
}

void get_fn(char a[]) {
    time_t t = time(NULL);
    struct tm* tm = localtime(&t);
    strftime(a, 20, "%Y%m%d.txt", tm);
}

void out(S a[]) {
    qsort(a, M, sizeof(S), cmp);

    char fn[20];
    get_fn(fn);

    printf("----------%sWinners----------\n", fn);
    for (int i = 0; i < M; i++) {
        printf("%ld\t%s\t%s\n", a[i].id, a[i].name, a[i].c);
    }

    FILE* f = fopen(fn, "w");
    if (!f) {
        printf("File write failed!\n");
        return;
    }
    for (int i = 0; i < M; i++) {
        fprintf(f, "%ld\t%s\t%s\n", a[i].id, a[i].name, a[i].c);
    }
    fclose(f);
    printf("File saved successfully!\n");
}

int main() {
    SetConsoleOutputCP(CP_UTF8);
    SetConsoleCP(CP_UTF8);

    S s[N];
    S w[M];
    int t = read(s);
    if (t == -1) return 1;
    if (t < M) {
        printf("Not enough students!\n");
        return 1;
    }

    rand_sel(s, t, w);
    out(w);

    return 0;
}