实验七

task.4

 1 #include <stdio.h>
 2 #include <ctype.h>
 3 #include <stdlib.h>
 4 
 5 int main() {
 6     FILE *file;
 7     char filename[] = "data4.txt";
 8     int line_count = 0;
 9     int char_count = 0;
10     int ch;
11     int in_line = 0; 
12 
13     file = fopen(filename, "r");
14     if (file == NULL) {
15         printf("无法打开文件 %s\n", filename);
16         system("pause");
17         return 1;
18     }
19 
20     while ((ch = fgetc(file)) != EOF) {
21         if (ch == '\n') {
22             line_count++;
23             in_line = 0;
24         } else if (!isspace(ch)) {
25             char_count++;
26             in_line = 1;
27         }
28 
29     }
30 
31 
32     if (in_line) {
33         line_count++;
34     }
35 
36     fclose(file);
37 
38     printf("%s统计结果:\n", filename);
39     printf("行数:    %d\n", line_count);
40     printf("字符数(不计空白符):    %d\n", char_count);
41 
42     
43     return 0;
44 }
View Code

task.5

#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...\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);
    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("d:\\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;
    char str[]="通过";
    FILE *fin;

    fin = fopen("list_pass.txt", "w");
    if (!fin) {
        printf("fail to open fileto write\n");
        return;
    }
    fprintf(fin,"准考证号\t姓名\t\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++)
            if(!strcmp(st[i].result,str))
            fprintf(fin,"%ld\t%s\t%.2f\t\t%.2f\t\t%.2f\t%s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[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,count=0;
    char str1[]="通过",str2[]="未通过";
    for(i=0;i<n;i++){
        st[i].sum=st[i].objective+st[i].subjective;
        if(st[i].sum>=60){
            strcpy(st[i].result,str1);
            count+=1;
        }
        else
            strcpy(st[i].result,str2);
    }
    return count;
}
View Code

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


#define MAX_STUDENTS 100
#define NAME_LENGTH 50
#define WINNERS 5

int main() 
{
    FILE *fp;
    char students[MAX_STUDENTS][NAME_LENGTH];
    char winners[WINNERS][NAME_LENGTH];
    int count = 0;
    int selected[WINNERS] = {0};
    char filename[100];
    int i, j, random_num;

    fp = fopen("list.txt", "r");
    if (fp == NULL) 
    {
        printf("无法打开文件!\n");
        return 1;
    }

    while (fgets(students[count], NAME_LENGTH, fp) != NULL && count < MAX_STUDENTS) 
    {
        students[count][strcspn(students[count], "\n")] = 0;
        count++;
    }
    fclose(fp);

    if (count == 0) 
    {
        printf("没有学生名单!\n");
        return 1;
    }
    
    srand(time(NULL));

    for (i = 0; i < WINNERS && count > 0; i++) 
    {
        do {
            random_num = rand() % count;
            for (j = 0; j < i; j++) 
            {
                if (selected[j] == random_num) 
                {
                    random_num = -1; 
                    break;
                }
            }
        } while (random_num == -1);

        selected[i] = random_num;
        strcpy(winners[i], students[random_num]);
    }

    printf("中奖名单:\n");
    for (i = 0; i < WINNERS && i < count; i++) 
    {
        printf("%s\n", winners[i]);
    }

    printf("请输入要写入的文件名:");
    scanf("%s", filename);

    fp = fopen(filename, "w");
    if (fp == NULL) 
    {
        printf("无法创建文件!\n");
       
        return 1;

    }

    for (i = 0; i < WINNERS && i < count; i++) 
    {
        fprintf(fp, "%s\n", winners[i]);
    }

    fclose(fp);
    printf("中奖名单已写入 %s\n", filename);
    
    return 0;
}
View Code

 

posted @ 2025-06-07 18:26  林觉得冷  阅读(9)  评论(0)    收藏  举报