实验五

1.1答:因为数组名本身就是地址

#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;
}

 

 

#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;
}

2.1答:生成了;不直观可见

#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;
}
#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;
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
    FILE* fin;
    char ch;
    int i = 0;
    fin = fopen("data3_1.txt", "r");
    if (fin == NULL)
    {
        printf("fail to open data3_1.txt\n");
        return 1;
    }
    while (!feof(fin))
    {
        ch = fgetc(fin);
        
        if(ch!=' '&&ch!='\t'&&ch!='\n'&&ch!=EOF)
            i++;
    }
    fclose(fin);
    printf("data3_1.txt中共包含字符数: %d", i);
    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;
    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,k;
    STU a;
    for (i = 0; i < n; i++)
    {
        s[i].sum = s[i].objective + s[i].subjective;
    }
    for (j = 0; j < n - 1; j++)
    {
        for (k = 0; k < n - 1 - j; k++)
        {
            if (s[k].sum < s[k + 1].sum)
            {
                a = s[k];
                s[k] = s[k + 1];
                s[k + 1] = a;
            }
        }
    }
    for (i = 0; i < n; i++)
    {
        if ((double)(i + 1) / n <= 0.1)
            strcpy(s[i].level, "优秀");
        else if((double)(i + 1) / n>0.1&& (double)(i + 1) / n<=0.5)
            strcpy(s[i].level, "合格");
        else
            strcpy(s[i].level, "不合格");
    }
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<time.h>
#include<stdlib.h>
#define N 80
#define M 5
typedef struct
{
    long int id;
    char name[20];
    char banji[60];
}STU;
int main()
{
    STU x[N], lucky[M];
    FILE* fin, * fout;
    int i,j;
    fin = fopen("list.txt", "r");
    if (fin == NULL)
    {
        printf("fail to open list.txt\n");
        return 1;
    }
    for (i = 0; i < N; i++)
    {
        fscanf(fin, "%ld %s %s", &x[i].id, x[i].name, x[i].banji);
    }
    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].id, lucky[i].name, lucky[i].banji);
        printf("%ld %s %s\n", lucky[i].id, lucky[i].name, lucky[i].banji);
    }
    fclose(fout);
    return 0;
}

 

posted @ 2022-06-06 19:29  唐卉宁  阅读(11)  评论(2编辑  收藏  举报