实验七

任务四

#include <stdio.h>
#include <stdlib.h>
int main()
{

    FILE* fp;
    int i = 0;
    char ch;
    fp = fopen_s(&fp,"data4.txt", "r");
    if (fp == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    while (!feof(fp))
    {
        ch = fgetc(fp);
        if (ch > 33)
            i++;
    }
    fclose(fp);
    printf("共包含字符数%d", i);
    return 0;
}

任务五

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_s(&fin,"examinee.txt", "r");
    if (fin == NULL) {
        printf("fail to open file\n");
        exit(0);
    }
    while (!feof(fin)) {
        for (i = 0; i < n; i++)
            fscanf_s(fin, "%ld %s %f %f", &s[i].id, s[i].name, &s[i].objective, &s[i].subjective,sizeof(s[i].id),sizeof(s[i].name),sizeof(s[i].objective),sizeof(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_s(&fout,"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) {
    int i, j;

    for (i = 0;i < n; i++) {
        s[i].sum = s[i].objective + s[i].subjective;
    }

    for (i = 0;i < n; i++) {
        for (j = 0;j < n - i - 1; j++) {
            if (s[j].sum < s[j + 1].sum) {
                STU t;
                t = s[j];
                s[j] = s[j + 1];
                s[j + 1] = t;
            }

        }
    }

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

任务六

#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#define N 100
int main()
{
    FILE* fp;
    int i, j, k, flag[5];
    char s[N][N];
    fp = fopen_s(&fp,"list.txt", "r");
    for (i = 0;i < 80;i++)
        fgets(s[i], 80, fp);
    fclose(fp);
    srand(time(NULL));
    fp = fopen_s(&fp,"lucky.txt", "w");
    for (i = 0;i < 5;i++)
    {
        k = rand() % (80 + i);flag[i] = k;
        for (j = 0;j < i;j++)
        {
            if (flag[i] == flag[j])i--;
        }
    }
    for (i = 0;i < 5;i++)
    {
        printf("%s", s[flag[i]]);
        fprintf(fp, "%s", s[flag[i]]);
    }
    fclose(fp);
    return 0;
}