实验七

任务4

task4.c

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int main() {
    FILE* file;
    char filename[] = "data4.txt";
    char ch;
    int line_count = 0;
    int char_count = 0;
    int is_new_line = 1;

    file = fopen(filename, "r");
    if (file == NULL) {
        printf("fail to open file to read\n");
        return 1;
    }

    while ((ch = fgetc(file)) != EOF) {
        if (ch == '\n') {
            line_count++;
            is_new_line = 1;
        }
        else if (ch != ' ' && ch != '\t' && ch != '\n') {
            char_count++;
            is_new_line = 0;
        }
    }

    if (!is_new_line) {
        line_count++;
    }

    fclose(file);

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

    return 0;
}

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任务5

task5.c

#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;
    }

    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) {
    FILE* file = fopen("list_pass.txt", "w");
    if (file == NULL) {
        printf("fail to open\n");
        return;
    }

    fprintf(file, "准考证号\t\t姓名\t\t客观题得分\t\t操作题得分\t\t总分\t\t结果\n");
    for (int i = 0; i < n; i++) {
        if (s[i].sum >= 60) 
            fprintf(file, "%ld\t\t%s\t\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);  
    }
    fclose(file);
}

// 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 pass_count = 0;
    for (int 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[pass_count++] = st[i];
        }
        else {
            strcpy(st[i].result, "未通过");
        }
    }
    return pass_count;
}

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任务6

task6.c

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h> 
#include <time.h>

#define N 80
#define M 5

typedef struct {
    char id[10];
    char name[20];
    char class[20];
}STUDENT;

int main() {
    STUDENT st[N],lucky[M];
    int lucky_index;
    int i=0,number;
    char filename[20];
    int flag[N] = { 0 };

    FILE* fp1;

    fp1 = fopen("list.txt", "r");

    if (fp1 == NULL) {
        printf("fail to open file to read\n");
        return;
    }

    while (!feof(fp1)){
        number = fscanf(fp1, "%s%s%s", st[i].id, st[i].name, st[i].class);
        if (number != 3)
            break;
        i++;
    }
    fclose(fp1);

    printf("-------中奖名单-------\n");

    srand(time(NULL));
    for (i = 0; i < M; i++) {
        lucky_index = rand() % N;

        if (flag[lucky_index] = 1) {
            lucky[i] = st[lucky_index];
            printf("%-10s%-20s%-20s\n", st[lucky_index].id, st[lucky_index].name, st[lucky_index].class);
            flag[lucky_index] = 0;
        }

        else
            i--;
    }

    printf("-------保存到文件-------\n");
    printf("输入文件名：");
    scanf("%s", filename);

    FILE* fp2;

    fp2 = fopen(filename, "wb");

    if (fp2 == NULL) {
        printf("fail to open file to write\n");
        return;
    }

    for (i = 0; i < M; i++) 
        fprintf(fp2,"%-10s%-20s%-20s\n",lucky[i].id,lucky[i].name,lucky[i].class);

    fclose(fp2);

    printf("保存成功\n");

    return 0;
}

 

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