实验七

#define _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 100
typedef struct {
    long number;
    char name[N];
    char class[N];
}student;
int main()
{
    FILE* fp;
    FILE* a;
    int i = 0;
    int j = 0;
    int k = 0;
    student stu[N];



    srand((unsigned int)time(NULL));
    long ret[5];
    for (i = 0; i < 5; i++)
    {
        ret[i] = rand() % 80 + 1;
    }

    fp = fopen("list.txt", "r");
    if (fp == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    a = fopen("lucky.txt", "w");
    if (a == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }

    while (!feof(fp))
    {
        fscanf(fp, "%ld %s %s", &stu[i].number, &stu[i].name, &stu[i].class);
        i++;
    }

    for (j = 0; j < 5; j++)
    {
        printf("%-20ld %-20s %-20s\n", stu[ret[j]].number, stu[ret[j]].name, stu[ret[j]].class);
        fprintf(a, "%-20ld %-20s %-20s\n", stu[ret[j]].number, stu[ret[j]].name, stu[ret[j]].class);
    }
    fclose(fp);
    fclose(a);
    return 0;
}

 

task4

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
    long i = 0;
    char ch;
    FILE* fp;
    fp = fopen("c://data//data4.txt", "r");
    while (!feof(fp))
    {
        ch = fgetc(fp);
        if (ch != ' ' && ch != '\n' && ch != '\t'&&ch!=EOF)
        {
            i++;
        }
    }
    printf("data4.txt中共包含字符（不计空字符）:%ld",i);
    fclose(fp);

    return 0;
}

task5

#define _CRT_SECURE_NO_WARNINGS
#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;          // 总分
    char ans[10];       // 考试结果
} STU;

// 函数声明
void finput(STU st[], int n);
void foutput(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...\n", N);
    finput(stu, N);

    printf("\n对考生成绩进行统计...\n");
    cnt = process(stu, N, stu_pass);

    printf("\n通过考试的名单:\n");
    output(stu, N);      // 输出到屏幕
    foutput(stu, N);    // 输出到文件

    pass_rate = 1.0 * cnt / N;
    printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100);

    return 0;
}

// 把通过考试的考生完整信息输出到屏幕上
// 准考证号，姓名，客观题得分，操作题得分，总分，结果
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].ans);
}

// 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 finput(STU st[], int n) {
    int i;
    FILE *fin;

    fin = fopen("c:\\data\\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", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective);
    }

    fclose(fin);
}

// 把通过考试的考生完整信息写入文件list_pass.txt
// 准考证号，姓名，客观题得分，操作题得分，总分，结果
void foutput(STU s[], int n) {
    FILE *fout;
    int i;
    
    // 保存到文件 
    fout = fopen("list_pass.txt", "w");
    if (!fout) {
        printf("fail to open or create list_pass.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结果\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].ans);

    fclose(fout);
}



// 对考生信息进行处理：计算每位考生考试总分、结果；统计考试通过的人数
int process(STU st[], int n, STU st_pass[]) {
    int i;
    int j = 0;
    for (i = 0; i < n; i++)
    {
        st[i].sum = st[i].objective + st[i].subjective;
    }
    for (i = 0; i < n; i++)
    {
        if (st[i].sum >= 60)
        {
            st_pass[j++] = st[i];
            strcpy(st[i].ans, "合格");   
        }
        else
        {
            strcpy(st[i].ans, "不合格");
        }
    }
    return j;
}

 task6.2

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 100
typedef struct {
    long number;
    char name[N];
    char class[N];
}student;
int main()
{
    FILE* fp;
    FILE* a;
    int i = 0;
    int j = 0;
    int k = 0;
    int random;
    student stu[N];



    srand((unsigned int)time(NULL));
    long ret[5];
    for (i = 0; i < 5; i++)
    {
        k = 0;
        random = rand() % 80 + 1;
        for (j = 0; j < 5; j++)
        {
            if (random == ret[j])
            {
                k = -1;
                i--;
                break;
            }
        }
        if (k == 0)
        {
            ret[i] = random;
        }
    }
    i = 0;
    fp = fopen("c:\\data\\list.txt", "r");
    if (fp == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    a = fopen("lucky.txt", "w");
    if (a == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }

    while (!feof(fp))
    {
        i++;
        fscanf(fp, "%ld %s %s", &stu[i].number, &stu[i].name, &stu[i].class);
        
    }
    for (j = 0; j <5 ; j++)
    {
        printf("随机数为：%d\n", ret[j]);
        printf("%-20ld %-20s %-20s\n", stu[ret[j]].number, stu[ret[j]].name, stu[ret[j]].class);
        fprintf(a, "%-20ld %-20s %-20s\n", stu[ret[j]].number, stu[ret[j]].name, stu[ret[j]].class);
    }
    fclose(fp);
    fclose(a);
    return 0;
}

只要将生成的随机数random与数组ret[5]中每一个元素进行比较即可，想同就重新生成，不同则录入。