实验七

实验四

#include <stdio.h>

int main() {
    FILE* fp;
    fp = fopen("data4.txt", "r");
    if (fp == NULL) {
        return -1;
    }
    char t;
    int line_count = 0, char_count = 0;
    while (feof(fp) == 0) {
        t = fgetc(fp);
        if (t == EOF) {
            line_count++;
            break;
        }
        else if (t!=' '&&t!='\n'&&t!='\t') {
            char_count++;
        }
        else if (t == '\n') {
            line_count++;
        }

    }
    printf("data4.txt统计结果\n行数：%d\n字数：%d", line_count, char_count);
}

实验五

#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) {
    // 待补足
    // xxx
    FILE* fp;
    int i;
    fp = fopen("list_pass.txt", "w");
    if (!fp) {
        printf("fail to open file\n");
        return;
    }
    for (i = 0; i < n; i++) {
        if (s[i].sum >= 60) {
            fprintf(fp, "%ld %s %f %f %f %s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);
        }
    }
}

// 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[]) {
    // 待补足
    // xxx
    int count = 0,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");
                st_pass[count] = st[i];
                count++;
            }
            else {
                strcpy(st[i].result, "不通过");
            }
        }
        return count;
    }

实验六

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

struct stu
{
    long long id;
    char name[20];
    char classes [20];
};


int main() {
    FILE* fp;
    struct stu students[80];

    fp = fopen("list.txt", "r");
    if (!fp) {
        printf("fail to open file\n");
        return -1;
    }
    for (int i = 0; i < 80; i++) {
        fscanf(fp, "%lld%s%s", &students[i].id, students[i].name, students[i].classes);
    }
    fclose(fp);
    srand((unsigned)time(NULL));

    int count = 0;
    int temp[5] = { 81,81,81,81,81 };
    struct stu p[5];

    while (count<5) {
        int a;
        a = rand() % 80;
        int flag = 0;
        for (int i = 0; i < 5; i++) {
            if (temp[i] == a) {
                flag = 1;
                break;
            }
        }
        if (flag) {
            continue;
        }
        temp[count] = a;
        p[count++] = students[a];
    }

    struct stu t;
    for (int i = 0; i < 5; i++) {
        for (int j = 0; j < 4 - i; j++) {
            if (p[j].id > p[j + 1].id) {
                t = p[j];
                p[j] = p[j + 1];
                p[j + 1] = t;
            }
        }
    }

    printf("----------------随机抽人名单-----------------\n");
    for (int i = 0; i < 5; i++) {
        fprintf(stdout, "%lld\t%s\t%s\n", p[i].id, p[i].name, p[i].classes);
    }
    printf("------------------保存文件-------------------\n");
    time_t timep;
    struct tm* pt;
    time(&timep);
    pt = gmtime(&timep);
    char path[100];
    char name[100];
    printf("输入文件名：");
    scanf("%s", name);
    sprintf(path, "%s_%d%d%d.txt",name,1990+ pt->tm_year,1+ pt->tm_mon, pt->tm_mday);

    FILE* fp2;
    fp2 = fopen(path, "w");
    for (int i = 0; i < 5; i++) {
        fprintf(fp2, "%lld\t%s\t%s\n", p[i].id, p[i].name, p[i].classes);
    }
    printf("保存成功！");
    fclose(fp2);
}