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实验7

任务4

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

void countFile()
{
    FILE *fp;
    char ch;
    int lines = 1;
    int chars = 0;

    fp = fopen("data4.txt", "r");

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

    while((ch = fgetc(fp)) != EOF)
    {
        if(ch == '\n')
        {
            lines++;
        }
        else if(ch != ' ' && ch != '\t' && ch != '\r')
        {
            chars++;
        }
    }

    fclose(fp);

    printf("文件行数:%d\n", lines);
    printf("字符数:%d\n", chars);
}


int main()
{
    countFile();
	system("pause");
    return 0;
}

image

任务5

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#include <stdio.h>
#include <string.h>
#include <stdlib.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: 已完成\n", N);
    read(stu, N);

    printf("\n对考生成绩进行统计: 已完成\n");
    cnt = process(stu, N, stu_pass);

    printf("\n所有考生完整信息:\n");
    output(stu, N);   

    printf("\n通过考试的名单写入文件: 已完成!\n");
    write(stu_pass, cnt);

    pass_rate = 1.0 * cnt / N;
    printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100);

	system("pause");
    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);
}

// 对考生信息进行处理:计算每位考生考试总分、结果;统计并返回通过考试的人数
int process(STU st[], int n, STU st_pass[]) {
    int passNum = 0;
	int 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[passNum++] = st[i];
        }
        else
        {
            strcpy(st[i].result, "不通过");
        }
    }
    return passNum;
}

// 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 = fopen("list_pass.txt", "w");
    if (!fout)
    {
        printf("打开输出文件失败!\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\t结果\n");
    for (i = 0; i < n; i++)
    {
        fprintf(fout, "%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);
    }
    fclose(fout);
}

{33E2D24D-FDBD-464C-A563-4498B0B1361D}

image

任务6

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#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>

#define MAX_STU 80
#define LEN 50

typedef struct {
    char id[20];
    char name[LEN];
    char cls[LEN];
} Student;

int main()
{
    Student stu[MAX_STU];
    Student win[5];
    int flag[MAX_STU] = {0};
    int total = 0;
    int win_cnt = 0;
    char filename[LEN];
    FILE* fp;
    FILE* fout;
    int i;

    fp = fopen("list.txt", "r");
    if (fp == NULL) {
        printf("无法打开list.txt,请确保文件与代码在同一目录!\n");
        system("pause");
        return 1;
    }

    while (fscanf(fp, "%s %s %[^\n]", stu[total].id, stu[total].name, stu[total].cls) == 3) {
        total++;
    }
    fclose(fp);

    srand((unsigned int)time(NULL));
    while (win_cnt < 5) {
        int idx = rand() % total;
        if (flag[idx] == 0) {
            flag[idx] = 1;
            win[win_cnt] = stu[idx];
            win_cnt++;
        }
    }

    printf("========== 中奖名单 ==========\n");
    for (i = 0; i < 5; i++) {
        printf("%s\t%s\t%s\n", win[i].id, win[i].name, win[i].cls);
    }

    printf("\n请输入保存文件名(例如 result.txt):");
    scanf("%s", filename);

    fout = fopen(filename, "w");
    if (fout == NULL) {
        printf("文件创建失败!\n");
        system("pause");
        return 1;
    }

    for (i = 0; i < 5; i++) {
        fprintf(fout, "%s %s %s\n", win[i].id, win[i].name, win[i].cls);
    }
    fclose(fout);
    printf("保存成功!已写入文件 %s\n", filename);

    system("pause");
    return 0;
}

{5BFF192A-F35E-4977-9F4D-7FFD5514D10B}

{ED76D6EC-C22D-4820-9C9E-9AF777498063}

posted on 2026-06-23 16:52  kobebrant24  阅读(7)  评论(0)    收藏  举报