实验七

实验内容

任务四

源代码

#include <stdio.h>
int main()
{
    FILE *fp;
    char ch;
    int line = 1;  
    int char_cnt = 0; 
    fp = fopen("data4.txt", "r");
    while ((ch = fgetc(fp)) != EOF)
    {
        if (ch == '\n')
        {
            line++;
        }
        else if (ch == ' '||ch == '\r'||ch == '\t')
        {
            continue;
        }
        else
        {
            char_cnt++;
        }
    }
    fclose(fp);
    printf("data4.txt统计结果：\n");
    printf("行数：        %d\n", line);
    printf("字符数(不计空白符)： %d\n", char_cnt);
    return 0;
}

运行结果截图

任务五

源代码

#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);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 i,num = 0;
    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[num] = st[i];
            num++;
        }
        else
            strcpy(st[i].result,"未通过");
    }
    return num; 
}

// 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");
    
    fprintf(fout, "准考证号\t姓名\t客观题\t操作题\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);
}

运行结果截图

任务六

源代码

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

#define MAX_STU 80
#define LEN_NAME 20
#define LEN_CLASS 30

typedef struct {
    long id;
    char name[LEN_NAME];
    char cls[LEN_CLASS];
} Student;

int readStu(Student stu[])
{
    FILE *fp = fopen("list.txt", "r");
   int cnt = 0;
    while(fscanf(fp, "%ld %s %s", &stu[cnt].id, stu[cnt].name, stu[cnt].cls) == 3)
    {
        cnt++;
    }
    fclose(fp);
    return cnt;
}

int main()
{
    Student stus[MAX_STU];
    Student win[5];
    int flag[MAX_STU] = {0};
    int total = readStu(stus);
    
    srand((unsigned)time(NULL)); 
    int pick = 0;
    while(pick < 5)
    {
        int idx = rand() % total;
        if(flag[idx] == 0)
        {
            flag[idx] = 1;
            win[pick] = stus[idx];
            pick++;
        }
    }

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

    char filename[50];
    printf("----------------------------\n");
    printf("输入文件名：");
    scanf("%s", filename);
    strcat(filename, ".txt"); 
    FILE *fw = fopen(filename, "w");
    for(int i = 0; i < 5; i++)
    {
        fprintf(fw, "%ld\t%s\t%s\n", win[i].id, win[i].name, win[i].cls);
    }
    fclose(fw);
    printf("保存成功！\n");
    return 0;
}

运行结果截图

选做

源代码

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

#define MAX_STU 80
#define LEN_NAME 20
#define LEN_CLASS 30

typedef struct {
    long id;
    char name[LEN_NAME];
    char cls[LEN_CLASS];
} Student;

int readStu(Student stu[])
{
    FILE *fp = fopen("list.txt", "r");
   
    int cnt = 0;
    while(fscanf(fp, "%ld %s %s", &stu[cnt].id, stu[cnt].name, stu[cnt].cls) == 3)
    {
        cnt++;
    }
    fclose(fp);
    return cnt;
}

void sortWin(Student arr[], int n)
{
    for(int i = 0; i < n - 1; i++)
    {
        for(int j = 0; j < n - i - 1; j++)
        {
            if(arr[j].id > arr[j+1].id)
            {
                Student temp = arr[j];
                arr[j] = arr[j+1];
                arr[j+1] = temp;
            }
        }
    }
}

int main()
{
    Student stus[MAX_STU];
    Student win[5];
    int flag[MAX_STU] = {0};
    int total = readStu(stus);
    
    srand((unsigned)time(NULL));
    int pick = 0;
    while(pick < 5)
    {
        int idx = rand() % total;
        if(flag[idx] == 0)
        {
            flag[idx] = 1;
            win[pick] = stus[idx];
            pick++;
        }
    }

    sortWin(win, 5);
    time_t now = time(NULL);
    struct tm *t = localtime(&now);
    char filename[30];
    strftime(filename, sizeof(filename), "%Y%m%d.txt", t); 

    printf("----------%s中奖名单----------\n", filename);
    for(int i = 0; i < 5; i++)
    {
        printf("%ld\t%s\t%s\n", win[i].id, win[i].name, win[i].cls);
    }
    FILE *fw = fopen(filename, "w");
    for(int i = 0; i < 5; i++)
    {
        fprintf(fw, "%ld\t%s\t%s\n", win[i].id, win[i].name, win[i].cls);
    }
    fclose(fw);
    printf("文件保存成功！\n");
    return 0;
}

运行结果截图