实验七

实验任务四

task4-1

源代码

#include <stdio.h>
#define M 80

int main() {
    char test1[2][M];
    int i,k;
    FILE *fp;
    for (i = 0; i < 2; i++)
        gets(test1[i]);

    fopen_s(&fp ,"data4.txt", "w");
    if(fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < 2; i++)
    {
        fputs(test1[i], fp);
        fputs("\n", fp);
    }
    
    fclose(fp);
    return 0;
}

实验结论

task4-2

源代码

#include <stdio.h>
#define M 80

int main() {
    FILE* fp;

    fopen_s(&fp, "data4.txt", "r");
    if (fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }

    int count = 0;
    char ch = ' ';
    while ((ch = fgetc(fp)) != EOF)
        if (ch != '\r' && ch != '\n' && ch != ' ')
            count++;


    printf("data4.txt中共计包含字符数（不计空白符）：%d", count);
    fclose(fp);
    return 0;
}

实验结论

实验任务五

源代码

#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;

    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, sizeof(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 
  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;
    STU t;
    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)
            {
                t = s[j];
                s[j] = s[j + 1];
                s[j + 1] = t;
            }
    for (i = 0; i < n; i++)
        if (i <= n * 0.1 - 1)
            strcpy_s(s[i].level, sizeof(s[i].level), "优秀");
        else if(i>n*0.1-1&&i<=n*0.5-1)
            strcpy_s(s[i].level, sizeof(s[i].level), "合格");
        else
            strcpy_s(s[i].level, sizeof(s[i].level), "不合格");

}

实验结论

 

实验任务六

源代码

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

#define N 10

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

// 函数声明
void input(STU s[], int n);

int main() {
    STU stu[N];
    STU studd[N];
    input( stu, N);
    srand((unsigned int)time(NULL));
    int i=0, j=0,k,flag;
    while ( i < 5)
    {
        flag = 0;
        if (i == 0)
            flag = 1;
        j = rand() % N + 0;
        studd[i] = stu[j];
        if (!flag)
            for (k = 0; k < i; k++)
                if (studd[i].id == studd[k].id)
                {
                    i--;
                    break;
                }
        i++;
    }
    for (i = 0; i < 5; ++i)
        printf("%ld. %-20s%-20s\n", studd[i].id, studd[i].name, studd[i].bj);
    int y;
    FILE* fp;
    fopen_s(&fp, "lucky.txt", "w");
    if (fp == NULL) {
        printf("fail to open file\n");
        return 1;
    }
    for (k = 0; k < 5; k++)
        fprintf(fp, "%ld. %-20s%-20s\n", studd[k].id,studd[k].name, studd[k].bj);
    fclose(fp);



    return 0;
}
void input(STU s[], int n) {
    int i;
    FILE *fq;

    fopen_s(&fq,"list.txt", "r");
    if (fq == NULL) {
        printf("fail to open file\n");
        exit(0);
    }

    while (!feof(fq)) {
        for (i = 0; i < n; i++)
            fscanf_s(fq, "%ld %s %s", &s[i].id, s[i].name, sizeof(s[i].name), s[i].bj,sizeof(s[i].bj));
    }

    fclose(fq);
}

实验结论

实验反思

对选做内容只做到了改进一，测试过很多数据，没有发现重复的。改进二对我来说有点难，所以我放弃了改进二。