实验7

试验任务4

代码：

#include <stdio.h>
#include <windows.h>

int main()
{
    FILE* fp;
    int line_cnt = 0, char_cnt = 0;
    char ch;
    int has_content = 0; 

    fp = fopen("data4.txt", "r");
    if (fp == NULL)
    {
        printf("文件打开失败，请检查data4.txt位置\n");
        system("pause");
        return 1;
    }

    while ((ch = fgetc(fp)) != EOF)
    {
        has_content = 1; 
        if (ch == '\n')
        {
            line_cnt++;
        }
        if (ch == ' ' || ch == '\n' || ch == '\t')
        {
            continue;
        }
        char_cnt++;
    }
    if (has_content)
    {
        line_cnt++;
    }

    fclose(fp);

    printf("data4.txt统计结果：\n");
    printf("行数：        %d\n", line_cnt);
    printf("字符数(不计空白符)： %d\n", char_cnt);
    system("pause");
    return 0;
}

 

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试验任务5

代码：

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

#define N 10

typedef struct {
    long id;            
    char name[20];      
    float objective;    
    float subjective;   
    float sum;         
    char result[10];    
} STU;

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;
}

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);
}

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);
}

int process(STU st[], int n, STU st_pass[]) {
    int i, pass_cnt = 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[pass_cnt] = st[i];
            pass_cnt++;
        }
        else
        {
            strcpy(st[i].result, "不通过");
        }
    }
    return pass_cnt;
}

void write(STU st[], int n) {
    int i;
    FILE *fout;
    fout = fopen("list_pass.txt", "w");
    if (!fout)
    {
        printf("文件打开失败\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结果\n");
    for (i = 0; i < n; i++)
    {
        fprintf(fout, "%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(fout);
}

 

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试验任务6

代码：

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

#define STU_NUM 80  
#define DRAW_NUM 5  

typedef struct
{
    long id;
    char name[20];
    char cls[30];
} Student;

void readStu(Student stu[])
{
    FILE* fp;
    int i;
    fp = fopen("list.txt", "r");
    if (fp == NULL)
    {
        printf("list.txt 文件打开失败！\n");
        system("pause");
        exit(1);
    }
    i = 0;
    while (fscanf(fp, "%ld %s %s", &stu[i].id, stu[i].name, stu[i].cls) != EOF && i < STU_NUM)
    {
        i++;
    }
    fclose(fp);
}

int main()
{
    Student allStu[STU_NUM];
    Student winner[DRAW_NUM];
    int flag[STU_NUM] = { 0 };
    int i, count, randIdx;
    char fileName[30];
    FILE* fout;

    count = 0;
    readStu(allStu);

    srand((unsigned)time(NULL));

    while (count < DRAW_NUM)
    {
        randIdx = rand() % STU_NUM;
        if (flag[randIdx] == 0)
        {
            flag[randIdx] = 1;
            winner[count] = allStu[randIdx];
            count++;
        }
    }

    printf("----------中奖名单----------\n");
    for (i = 0; i < DRAW_NUM; i++)
    {
        printf("%ld\t%s\t%s\n", winner[i].id, winner[i].name, winner[i].cls);
    }
    printf("----------保存到文件----------\n");
    printf("输入文件名：");
    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 < DRAW_NUM; i++)
    {
        fprintf(fout, "%ld\t%s\t%s\n", winner[i].id, winner[i].name, winner[i].cls);
    }
    fclose(fout);

    printf("保存成功！\n");
    system("pause");
    return 0;
}

 

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