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实验五

2022-06-07 01:02:46  阅读：162  来源： 互联网

标签：fp name int lucky char 实验 define 


#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;
}

 

 

 

两者字符型数组，name、author就是该数组第一个数组的指针位置，不需要加&

#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;
}

 

 

 

 1、生成了；2、可以打开。

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>

int main()
{
    FILE* fin;
    char ch;
    int c = 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 >= 33 && ch <= 122)
            c += 1;
    }
    printf("data3_1.txt中共包含字符数：%d", c);
    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;
    float Y, L;
    STU temp;
    for (i = 0; i < n; i++)
        s[i].sum = s[i].objective + s[i].subjective;
    for (i = 1; i < n; i++)
        for (j = 0; j < i; j++)
        {
            if (s[i].sum > s[j].sum)
            {
                k = j;
                temp = s[i];
                for (j = i - 1; j >= k; j--)
                    s[j + 1] = s[j];
                s[k] = temp;
            }
        }
    Y = s[(int)(n * 0.1 - 1)].sum;
    L = s[(int)(n * 0.5 - 1)].sum;
    for (i = 0; i < n; i++)
        if (s[i].sum >= Y)
            strcpy(s[i].level, "优秀");
        else if (s[i].sum >= L)
            strcpy(s[i].level, "合格");
        else
            strcpy(s[i].level, "不合格");
}

 

 

 

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define M 80
#define N 5
typedef struct
{
    long int id;
    char name[20];
    char classes[80];
    int target;
} STU;
void input(STU s[], int n);
void random(STU s[], STU lucky[], int m, int n);
void output(STU lucky[], int n);
int main()
{
    STU stu[M];
    STU lucky[N];
    input(stu, M);
    random(stu, lucky, M, N);
    output(lucky, N);
    return 0;
}
void input(STU s[], int n)
{
    int i;
    FILE* fin;
    fin = fopen("list.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 %s", &s[i].id, s[i].name,
                s[i].classes);
    }
    fclose(fin);
}
void random(STU s[], STU lucky[], int m, int n)
{
    int k = 0;
    srand(time(NULL));
    while (k < n)
    {
        int i = rand() % m + 1;
        lucky[k] = s[i];
        k++;
    }
}
void output(STU lucky[], int n)
{
    for (int i = 0; i < 5; i++)
        printf("%ld\t%-10s %-10s\n", lucky[i].id, lucky[i].name, lucky[i].classes);
    FILE* fout;
    fout = fopen("lucky.txt", "w");
    for (int i = 0; i < n; i++)
        fprintf(fout, "%ld\t%-10s %-10s\n", lucky[i].id, lucky[i].name, lucky[i].classes);
    fclose(fout);
}

 

 

 

 

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<time.h>
#include<stdlib.h>
#define N 80
struct student
{
    char xuehao[11];
    char name[10];
    char grade[20];
};
int main()
{
    struct student std[N];
    int i, t;
    FILE* fp, * fout;

    srand(time(0));

    fp = fopen("list.txt", "r");
    if (fp == NULL)
    {
        printf("fail to open\n");
        exit(0);
    }
    fout = fopen("lucky.txt", "w+");

    if (fout == NULL)
    {
        printf("fail to creat\n");
        exit(0);


    }
    for (i = 0; i < N; i++)

        fscanf(fp, "%s %s %s", std[i].xuehao, std[i].name, std[i].grade);

    for (i = 0; i < 5; i++)
    {
        t = rand() % 80;

        printf("%-20s %-20s %-20s\n", std[t].xuehao, std[t].name, std[t].grade);

        fprintf(fout, "%-20s %-20s %-20s\n", std[t].xuehao, std[t].name, std[t].grade);
    }


    fclose(fp);
    fclose(fout);
    system("pause");
}

 

 

 

标签：fp,name,int,lucky,char,实验,define
来源： https://www.cnblogs.com/bsxl/p/16350313.html

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