实验七

标签：fp int char STU 实验 printf include

任务一

#include<stdio.h>
#define N 7
#define M 80

typedef struct
{
    char name[M];  //书名
    char author[M];  //作者 
}BOOK;

int main()
{
    BOOK x[N] = {{"《雕塑家》","斯科特·麦克劳德"},
                {"《灯塔》","克里斯多夫·夏布特"},
                {"《五号屠杀场》","库尔特·冯内古特"},
                {"《出卖月亮的人》","罗伯特·海因莱茵"},
                {"《大地之上》","罗欣顿·米斯特里"},
                {"《上学记》","何兆武"},
                {"《命运》","蔡崇达"} };
                
    int i;
    FILE *fp;
    
    //以写的方式打开文本文件data1.txt
    fp=fopen("data1.txt","w");
    
    if(fp==NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    
    //将结构体数组x中的图书信息写到fp指向的文件data1.txt
    //同时也输出到屏幕上
    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;
}

//从文本文件data1.txt中读取图书信息，并打印输出到屏幕
#include<stdio.h>
#define N 10
#define M 80

typedef struct
{
    char name[M];
    char author[M];
}BOOK;

int main()
{
    BOOK x[N];
    int i,n;
    FILE *fp;
    
    fp = fopen("data1.txt","r");
    
    if(fp == NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    
    i=0;
    while(!feof(fp))
    {
        fscanf(fp,"%s%s",x[i].name,x[i].author);
        ++i;
    }
    n = i;
    
    //将图书信息打印输出到屏幕上
    for(i=0;i<n;++i)
    printf("%d. %-20s%-20s\n",i+1,x[i].name,x[i].author);
    
    fclose(fp);
    
    return 0; 
}

任务三

//使用fputs()将字符串写入文本文件

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

int main()
{
    char songs[N][M]={"Working\'s Blues",
                      "Everything Will Flow",
                      "Streets of London",
                      "Perfect Day",
                      "Philadelphia"};
    int i;
    FILE *fp;
    
    fp = fopen("data3.txt","w");
    
    if(fp==NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    
    for(i=0;i<N;++i)
    {
        fputs(songs[i],fp);
        fputs("\n",fp);
    }
    
    fclose(fp);
    return 0;
}

//使用fgets()从文件中读取字符串并在屏幕上显示

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

int main()
{
    char songs[N][M];
    int i;
    FILE *fp;
    
    fp = fopen("data3.txt","r");
    
    if(fp==NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    
    for(i=0;i<N;++i)
    fgets(songs[i],80,fp);
    
    for(i=0;i<N;++i)
    printf("%d. %s",i+1,songs[i]);
    
    fclose(fp);
    return 0;
}

#include<stdio.h>
int main()
{
    char ch;
    FILE *fp;
    
    fp = fopen("data3.txt","r");
    if(fp==NULL)
    {
        printf("fail to open file\n");
        return 1;
    }
    
    ch = fgetc(fp);
    while(ch!=EOF)
    {
        putchar(ch);
        ch = fgetc(fp);
    }
    
    fclose(fp);
    return 0;
}

任务四

#include <stdio.h>

int main() {
    char ch;
    int count=0;
    
    FILE *fp;
    fp=fopen("data4.txt","r");
    if(fp==NULL) {
        printf("fail to open file\n");
        return 1;
    }
    
    while(ch!=EOF) {
        ch=fgetc(fp);
        if(ch>=33&&ch<=126)
        count+=1;
    }
 
    printf("data4.txt中共包含字符数（不计空白符）：%d\n",count);
    fclose(fp);
    
    return 0;
}

任务五

#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 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) {
    int i,j,flag;
    int levelarray[N];
    STU tmp[1];
    
    for (i = 0; i < n; i++) {
        s[i].sum=s[i].objective+s[i].subjective;
    }
    
    for(i=0;i<n;i++) {
        for(j=0;j<n-i-1;j++) {
            if(s[j].sum<s[j+1].sum) {
                tmp[0]=s[j];
                s[j]=s[j+1];
                s[j+1]=tmp[0];
                flag=1; 
            }
        }
        if(flag=0) break;
    }
    
    for (i = 0; i < n; i++) {
        if((i+1)<=N*0.1) strcpy(s[i].level,"优秀");
        else if((i+1)>N*0.1&&(i+1)<=N*0.5) strcpy(s[i].level,"合格");
        else if((i+1)>N*0.5) strcpy(s[i].level,"不合格");
    }
}

任务六

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h> 

#define N 80

typedef struct {
    long id;
    char name[20];
    char cls[30];
} STU;

void input(STU s[], int n);
void output(STU s[], int n);
void process(STU s[], STU t[], int n); 

int main() {
    
    int n;
    STU s[N],l[N];
    
    input(s,N);
    
    srand(time(NULL));
    
    while(1) {
        printf("请输入要抽取的学生人数：");
        
        if(scanf("%d", &n)==EOF) break;

        process(s,l,n);
    
        printf("\n输出结果…\n\n");
        output(l,n);
    }
    
    
    return 0;
}

//函数部分 

void input(STU s[], int n) {
    int i;
    FILE *fin;
    
    printf("正在尝试从文件读取信息…"); 
    fin = fopen("list.txt", "r");
    if (fin == NULL) {
        printf("文件不存在\n");
        exit(0);
    }

    while (!feof(fin)) {
        for (i = 0; i < n; i++)
            fscanf(fin, "%d %s %s", &s[i].id, s[i].name, s[i].cls);
    }

    fclose(fin);
    printf("成功\n\n");
}

void output(STU s[], int n) {
    FILE *fout;
    int i;
    time_t timeseed;
    struct tm *now;
    char name[N] = {0};
 
    time(&timeseed);
    now = localtime(&timeseed);
    strftime(name, N, "%Y.%m.%d %H-%M-%S.txt", now);
    
    printf("\n");
    //printf("%s\n", name);
    
    printf("学号\t\t姓名\t\t班级\n");
    for (i = 0; i < n; i++)
        printf("%d\t%s\t\t%s\n", s[i].id, s[i].name, s[i].cls);
        
    printf("\n");
    
    fout = fopen(name, "w");
    /*if (!fout) {
        printf("fail to open or create lucky.txt\n");
        exit(0);
    }*/
    
    fprintf(fout, "学号\t\t姓名\t\t班级\n");
    for (i = 0; i < n; i++)
        fprintf(fout, "%d\t%s\t\t%s\n", s[i].id, s[i].name, s[i].cls);

    fclose(fout);
}

void process(STU s[], STU t[], int n) {
    
    if (n == 0) {
        printf("未抽取\n");
        exit(0);
    }
    
    int i, k;
    STU *temp[N];
    
    for(i = 0; i < N; i++)
        temp[i] = &s[i];
    
    for( i = 0; i < n; )
    {
        k = rand()%N;
        
        if(temp[k] != NULL)
        {
            t[i++] = s[k];
            temp[k] = NULL;
        }
    }
}

标签：fp,int,char,STU,实验,printf,include
From： https://www.cnblogs.com/xsh123456/p/17472120.html

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