实验7

task4

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#define _CRT_SECURE_NO_WARNINGS

int main() {
    FILE* fp;
    char ch;
    int line_count = 0;
    int char_count = 0;

    fp = fopen("data4.txt", "r");
    if (!fp) {
        printf("fail to open file to read/n");
        return(-1);
    }

    while ((ch = fgetc(fp)) != EOF) {
        if (ch == '\n') {
            line_count++;
        }
        if (!isspace(ch)) {
            char_count++;
        }
    }

    if (char_count > 0) {
        line_count++;
    }

    fclose(fp);

    printf("data4.txt 统计结果：\n");
    printf("行数：%d\n", line_count);
    printf("字符数(不计空白符)：%d\n", char_count);

    return 0;
}

　　

task5

#include <stdio.h>
#include <string.h>
#define _CRT_SECURE_NO_WARNINGS
#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 st[], int n) {
    int i;
    FILE* fout;
    fout = fopen("list_pass.txt", "w");
    if (!fout) {
        printf("fail to open file\n");
        return;
    }
    fprintf(fout, "准考证号\t姓名\t客观题得分\t操作题得分\t总分\t结果\n");
    for (i = 0; i < n; i++) {
        fprintf(fout, "%ld\t%s\t%.2f\t%.2f\t%.2f\t%s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].result);
    }
    fclose(fout);
}

// 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, j = 0;
    for (i = 0; i < n; i++) {
        st[i].sum = st[i].objective + st[i].subjective;
        if (st[i].sum >= 60) {
            st_pass[j++] = st[i];
        }
    }
    return j;
}

 

task6

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 80

typedef struct {
    int number;
    char name[10];
    char class[20];
    int prize;
}STU;

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

void chose(STU s[]) {
    int j = 5;
    srand(time(NULL));
    for (int i = 0; i < j; ++i) {
        int random = rand() % 80;
        if (s[random].prize == 1) {
            j++;
        }
        else {
            s[random].prize = 1;
        }
    }
}

void showname(STU s[],int n) {
    STU s_p[5];
    int i;
    int j = 0;
    for (i = 0; i < n; ++i) {
        if (s[i].prize == 1) {
            s_p[j] = s[i];
            j++;
        }
    }
    STU temp;
    for (int k = 0; k < 4; ++k) {
        for (int m = 0; m < 4-k; ++m) {
            if (s_p[m].number > s_p[m + 1].number) {
                temp = s_p[m];
                s_p[m] = s_p[m + 1];
                s_p[m + 1] = temp;
            }
                
        }
    }
    printf("中奖名单：\n");
    for (int k = 0; k < 5; ++k) {
        printf("%-20d%-20s%-20s\n", s_p[k].number, s_p[k].name, s_p[k].class);
    }
}

void write(STU s[]) {
    FILE* fp;
    fp = fopen("list_p.txt", "w");
    if (fp == NULL) {
        printf("文件打开失败\n");
        return;
    }
    for (int i = 0; i < 5; ++i) {
        fprintf(fp, "%-20d%-20s%-20s\n", s[i].number, s[i].name, s[i].class);
    }
    fclose(fp);
}

int main() {
    STU student[80];
    read(student);
    chose(student);
    showname(student, N);
    write(student);


}