实验5

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#define N 5
#define M 80
typedef struct
{
    char name[M];
    char author[M];
} Book;
int main()
{
    Book x[N] = { {"一九八四","乔治.威尔逊"},
        {"美丽新世界","赫胥黎" },
        {"昨日的世界","斯蒂芬.茨威格"},
        {"万历十五年","黄仁宇"},
        {"一只特立独行的猪","王小波"} };
    int i;
    FILE* fp;
    fp = fopen("data1.txt", "w");
    if (fp == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < N; ++i)
    {
        fprintf(fp, "%-20s %-20s\n", x[i].name, x[i].author);
        printf("%-20s %-20s\n", x[i].name, x[i].author);
    }
    fclose(fp);
    return 0；

 

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#define N 5
#define M 80
typedef struct
{
    char name[M];
    char author[M];
}Book;
int main()
{
    Book x[N];
    int i;
    FILE *fp;
    fp = fopen("C:\\Users\\PC\\source\\repos\\shiyan5.1\\shiyan5.1\\data1.txt", "r");
    if (fp == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < N; i++)
    {
        fscanf(fp, "%s %s\n", x[i].name, x[i].author);
        printf("%-20s %-20s\n", x[i].name, x[i].author);
    }
    fclose(fp);
    return 0;
}

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main()
{
    FILE *fin, *fout;
    char ch;
    fin = fopen("data3_1.txt", "r");
    if (fin == NULL)
    {
        printf("fail to open data3_1.txt\n");
        return 1;
    }
    fout = fopen("data3_2.txt", "w");
    if (fout == NULL)
    {
        printf("fail to open data3_2.txt\n");
        return 1;
    }
    while (!feof(fin))
    {
        ch = fgetc(fin);
        if (ch >= 'a' && ch <= 'z')
            ch -= 32;
        fputc(ch, fout);
    }
    fclose(fin);
    fclose(fout);
    return 0;
}

 

#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;
    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("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", &s[i].id, 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 
    fout = fopen("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)
{
    STU t;
    int i, j, k;
    for (i = 0; i < n; i++) s[i].sum = s[i].objective + s[i].subjective;
    for (j = 0; j < n; j++)
    {
        for (k = 0; k <= j; k++)
        {
            if (s[k].sum < s[j].sum)
            {
                t = s[k];
                s[k] = s[j];
                s[j] = t;
            }
        }
    }
    for (i = 0; i < 1; i++) strcpy(s[i].level, "优秀");
    for (; i >= 1 && i < 5; i++) strcpy(s[i].level, "合格");
    for (; i < n; i++) strcpy(s[i].level, "不合格");
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 80
#define M 5

typedef struct
{
    long no;
    char name[20];
    char class[80];
}STU;
int main()
{
    int i, j;
    STU x[N], lucky[M];
    FILE* fin, * fout;
    fin = fopen("list.txt", "r");
    if (fin == NULL)
    {
        printf("fail to open file\n");
        exit(0);
    }
    for (i = 0; i < N; i++)
    {
        fscanf(fin, "%ld %s %s", &x[i].no, x[i].name, x[i].class);
    }
    fclose(fin);
    srand(time(0));
    for (i = 0; i < M; i++)
    {
        j = rand() % 80;
        lucky[i] = x[j];
    }
    fout = fopen("lucky.txt", "w");
    if (fout == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < M; i++)
    {
        fprintf(fout, "%ld %s %s\n", lucky[i].no, lucky[i].name, lucky[i].class);
        printf("%ld %s %s\n", lucky[i].no, lucky[i].name, lucky[i].class);
    }
    fclose(fout);
    return 0;
}