实验七

实验一：验证性实验

实验二：验证性实验

实验三：验证性实验

实验四：

#include <stdio.h>
#include <stdlib.h>  // 为system("pause")
int main()
{
    FILE *fp;
    char ch;
    int line = 0;        
    int charCount = 0;   

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

    while ((ch = fgetc(fp)) != EOF)
    {
        if (ch == '\n')
        {
            line++;
        }
        /
        else if (ch != ' ' && ch != '\t')
        {
            charCount++;
        }
    }
    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", charCount);
    system("pause"); 
    return 0;
}

 

 

实验五：

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <windows.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() {
    SetConsoleOutputCP(936);
    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;
}

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结果\n");
    for (i = 0; i < n; i++)
        printf("%ld\t\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);
}

void read(STU st[], int n) {
    int i;
    FILE *fin;
    fin = fopen("examinee.txt", "r");
    if (!fin) {
        printf("文件打开失败，请检查txt存放路径！\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_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[pass_num] = st[i];
            pass_num++;
        } else {
            strcpy(st[i].result, "未通过");
        }
    }
    return pass_num;
}

void write(STU st[], int n) {
    int i;
    FILE *fout;
    fout = fopen("list_pass.txt", "w");
    if (!fout) {
        printf("fail to open write file\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%.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);
}

 

 

 

 

实验六：

 

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

#define MAX_STUDENT 80
#define WIN_COUNT 5

typedef struct {
    long id;
    char name[20];
    char className[40];
} Student;

int main(void)
{
    SetConsoleOutputCP(936);
    Student stuArr[MAX_STUDENT];
    int total = 0;
    int selected[MAX_STUDENT] = {0};
    Student winner[WIN_COUNT];
    char saveFileName[50];
    FILE *fpRead, *fpWrite;

    fpRead = fopen("list.txt", "r");
    if (fpRead == NULL)
    {
        printf("Error: Cannot open list.txt\n");
        system("pause");
        return 1;
    }

    while (total < MAX_STUDENT && fscanf(fpRead, "%ld %s ", &stuArr[total].id, stuArr[total].name) == 2)
    {
        fgets(stuArr[total].className, sizeof(stuArr[total].className), fpRead);
        stuArr[total].className[strcspn(stuArr[total].className, "\n")] = '\0';
        total++;
    }
    fclose(fpRead);

    if(total < WIN_COUNT)
    {
        printf("Insufficient number of students\n");
        system("pause");
        return 1;
    }

    srand((unsigned)time(NULL));
    for(int i = 0; i < WIN_COUNT; )
    {
        int idx = rand() % total;
        if(!selected[idx])
        {
            selected[idx] = 1;
            winner[i++] = stuArr[idx];
        }
    }

    printf("===== Winner List =====\n");
    printf("ID\t\tName\t\tClass\n");
    for(int i = 0; i < WIN_COUNT; i++)
    {
        printf("%ld\t%s\t%s\n",winner[i].id,winner[i].name,winner[i].className);
    }

    printf("\nEnter output filename:");
    scanf("%s", saveFileName);

    fpWrite = fopen(saveFileName, "w");
    fprintf(fpWrite, "Winner List\n");
    fprintf(fpWrite, "ID\tName\tClass\n");
    for(int i = 0; i < WIN_COUNT; i++)
    {
        fprintf(fpWrite, "%ld\t%s\t%s\n",winner[i].id,winner[i].name,winner[i].className);
    }
    fclose(fpWrite);
    printf("Data saved to %s successfully\n", saveFileName);

    system("pause");
    return 0;
}