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.奥威尔"},
                  {"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;
}

 

 

 

 

 

1.2

#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("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;
}

 

 

  x[i].name本身就是地址，不需要加地址符

2.1

#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.奥威尔"},
                 {"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("data2.dat", "wb");
    if (fp == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    fwrite(x, sizeof(Book), N, fp);
    fclose(fp);
    return 0;
}

 

 

 生成了data2.dat并且用word打开可见

 2.2

#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("data2.dat", "rb");
    
    if (fp == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    
    fread(x, sizeof(Book), N, fp);
    
    for (i = 0; i < N; ++i)
        printf("%-20s%-20s\n", x[i].name, x[i].author);
    fclose(fp);
    return 0;
}

 

 

 3.2

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
    int i = 0;
    FILE* fp;
    char ch;
    fp = fopen("data3_1.txt", "r");
    if (fp == NULL)
    {
        printf("fail to find file\n");
        return 1;
    }
    while ((ch = fgetc(fp))!=EOF)
    {
        if (ch != '\n' && ch!=' ' && ch != '\t')
            i++;
    }
    printf("data3_1.txt中共包含字符数：%d", i);
    fclose(fp);
    return 0;
}

 

 5

#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;
    float subjective; 
    float sum;
    char level[10];
} STU;
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;
}
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);
}
void output(STU s[], int n)
{
    FILE* fout;
    int i;
    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);
    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);
}
void process(STU s[], int n)
{
    int i,j;
    STU t[10];
    for (i = 0; i < n; i++)
    {
        s[i].sum = s[i].subjective + s[i].objective;
    }
    for (j = 1; j < n * n / 2; j++)
    {
        for (i = 0; i < n - 1; i++)
        {
            if (s[i].sum < s[i+1].sum)
            {
                t[i] = s[i];
                s[i] = s[i + 1];
                s[i + 1] = t[i];
            }

        }
    }
    i = 0;
    while (i < n)
    {
        if (i == 0)
            strcpy(s[i].level, "优秀");
        else if (i >= 1 && i <= 4)
            strcpy(s[i].level, "合格");
        else
            strcpy(s[i].level, "不合格");
        i++;
    }
}

 

 

 

 6

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 5
#define M 80
typedef struct
{
    char id[20];
    char name[20];
    char banji[20];
}lucky;
int main()
{
    int i, j;
    lucky s[M];
    FILE* fin;
    FILE* fout;
    srand(time(0));
    fin = fopen("list.txt", "r");
    if (fin == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < M; i++)
    {
        fscanf(fin, "%s %s %s\n", s[i].id, s[i].name, s[i].banji);
    }

    fout = fopen("lucky.txt", "w");
    if (fout == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    for (i = 0; i < N; i++)
    {
        j = rand() % 80;
        printf("%-20s %-20s %-20s\n", s[j].id, s[j].name, s[j].banji);
        fprintf(fout, "%-20s %-20s %-20s\n", s[j].id, s[j].name, s[i].banji);
    }
    fclose(fin);
    fclose(fout);
    return 0;

}