实验七

实验任务4

程序源码

#include <stdio.h>
#include <ctype.h>

int main()
{
    FILE *fp;
    char ch;
    int count = 0;
    fp = fopen("data4.txt", "r");
    while ((ch = fgetc(fp)) != EOF)
    {
        if (!isspace(ch))
        {
            count++;
        }
    }
    fclose(fp);
    printf("data4.txt中共包含字符数(不计空白符): %d", count);
    return 0;
}

程序运行截图

实验任务5

程序源码

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

#define N 10

typedef struct
{
    long int id;
    char name[20];
    float objective;  // 客观题得分
    float subjective; // 操作题得分
    float sum;
    char level[10];
} STU;

// 函数声明
void input(STU s[], int n);
void output(STU s[], int n);
void process(STU s[], int n);

int main()
{
    STU stu[N];

    printf("从文件读入%d个考生信息: 准考证号，姓名，客观题得分(<=40)，操作题得分(<=60)\n", N);
    input(stu, N);

    printf("\n对考生信息进行处理: 计算总分，确定等级\n");
    process(stu, N);

    printf("\n打印考生完整信息, 并保存到文件中");
    output(stu, N);

    return 0;
}

// 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 input(STU s[], int n)
{
    int i;
    FILE *fin;

    fin = fopen("examinee.txt", "r");
    if (fin == NULL)
    {
        printf("fail to open file\n");
        exit(0);
    }

    while (!feof(fin))
    {
        for (i = 0; i < n; i++)
            fscanf(fin, "%ld %s %f %f", &s[i].id, s[i].name, &s[i].objective, &s[i].subjective);
    }

    fclose(fin);
}

// 输出考生完整信息: 准考证号，姓名，客观题得分，操作题得分，总分，等级
// 不仅输出到屏幕上，还写到文本文件result.txt中
void output(STU s[], int n)
{
    FILE *fout;
    int i;

    // 输出到屏幕
    printf("\n");
    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等级\n");
    for (i = 0; i < n; i++)
        printf("%ld\t\t%s\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].level);

    // 保存到文件
    fout = fopen("result.txt", "w");
    if (!fout)
    {
        printf("fail to open or create result.txt\n");
        exit(0);
    }

    fprintf(fout, "准考证号\t\t姓名\t客观题得分\t操作题得分\t总分\t\t等级\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", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].level);

    fclose(fout);
}

// 对考生信息进行处理：计算总分，排序，确定等级
void process(STU s[], int n)
{
    // 补足代码
    for (int i = 0; i < n; i++)
    {
        s[i].sum = s[i].objective + s[i].subjective;
    }

    STU temp;

    for (int i = 0; i < n - 1; i++)
    {
        for (int j = 0; j < n - i - 1; j++)
        {
            if (s[j].sum < s[j + 1].sum)
            {
                temp.id = s[j].id;
                temp.objective = s[j].objective;
                temp.subjective = s[j].subjective;
                temp.sum = s[j].sum;
                strcpy(temp.level, s[j].level);
                strcpy(temp.name, s[j].name);

                s[j].id = s[j + 1].id;
                s[j].objective = s[j + 1].objective;
                s[j].subjective = s[j + 1].subjective;
                s[j].sum = s[j + 1].sum;
                strcpy(s[j].level, s[j + 1].level);
                strcpy(s[j].name, s[j + 1].name);

                s[j + 1].id = temp.id;
                s[j + 1].objective = temp.objective;
                s[j + 1].subjective = temp.subjective;
                s[j + 1].sum = temp.sum;
                strcpy(s[j + 1].level, temp.level);
                strcpy(s[j + 1].name, temp.name);
            }
        }
    }

    for (int i = 0; i < n; i++)
    {
        if ((i + 1) <= n * 0.1)
        {
            strcpy(s[i].level, "优秀");
        }
        else if ((i + 1) <= n * 0.5)
        {
            strcpy(s[i].level, "合格");
        }
        else
        {
            strcpy(s[i].level, "不合格");
        }
    }
}

程序运行截图

实验任务6

程序源码

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

#define N 80
#define NCHOOSE 5

typedef struct
{
    long int id;
    char name[20];
    char className[100];
} STU;

void input(STU s[], int n);
void process(STU stu[], STU stuChoose[], int n);
void output(STU s[], int n);

int main()
{
    STU stu[N];
    STU stuChoose[NCHOOSE];
    input(stu, N);
    process(stu, stuChoose, N);
    output(stuChoose, NCHOOSE);
    return 0;
}

void input(STU s[], int n)
{
    int i;
    FILE *fin;
    fin = fopen("list.txt", "r");
    if (fin == NULL)
    {
        printf("fail to open file\n");
        exit(0);
    }
    while (!feof(fin))
    {
        for (i = 0; i < n; i++)
            fscanf(fin, "%ld    %s    %s\n", &s[i].id, s[i].name, s[i].className);
    }
    fclose(fin);
}

void output(STU s[], int n)
{
    FILE *fout;
    int i;
    for (i = 0; i < n; i++)
        printf("%ld    %s    %s\n", s[i].id, s[i].name, s[i].className);
    fout = fopen("lucky.txt", "w");
    if (!fout)
    {
        printf("fail to open or create result.txt\n");
        exit(0);
    }
    for (i = 0; i < n; i++)
        fprintf(fout, "%ld    %s    %s\n", s[i].id, s[i].name, s[i].className);
    fclose(fout);
}

void process(STU stu[], STU stuChoose[], int n)
{
    srand(time(NULL));
    int nums[NCHOOSE] = {-1};
    int temp, i, j;
    for (i = 0; i < NCHOOSE; i++)
    {
        temp = rand() % 80;
        for (j = 0; j < i; j++)
        {
            if (nums[j] == temp)
            {
                i--;
                break;
            }
        }
        if (j == i)
        {
            nums[i] = temp;
        }
    }
    for (int i = 0; i < NCHOOSE; i++)
    {
        stuChoose[i].id = stu[nums[i]].id;
        strcpy(stuChoose[i].className, stu[nums[i]].className);
        strcpy(stuChoose[i].name, stu[nums[i]].name);
    }
}

 程序运行截图