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实验七

时间：2023-06-14 17:00:24浏览次数：22  
标签：fp int char 实验 printf include define

task1_1

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

typedef struct{
    char name[M];
    char author[M];
}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"},
                {"《五号屠宰场》","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;
    
    fp=fopen("data1.txt","w");
    
    if(fopen==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;
}

 task1_2

#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-1;
    
    for(i=0;i<N;++i)
    printf("%d. %-20s%-20s\n",i+1,x[i].name,x[i].author);
    
    fclose(fp);
    
    return 0;
}

 

将n=i-1换成n=i后运行结果

 原因：n此时等于9，多读了一个没有的信息。

 task2_1

#include <stdio.h>
#define N 7
#define M 80
typedef struct {
char name[M];
char author[M]; 
} 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"},
                 {"《五号屠宰场》", "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;
    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;
}

 

 

task2_2

#include<stdio.h> 

#define N 7
#define M 80

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

int main(){
    Book x[N];
    int i,n;
    
    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("%d. %-20s%-20s\n",i+1,x[i].name,x[i].author);
    
    fclose(fp);
    
    return 0;
}

 

 task3_1

#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;
}

 

原因：反斜杠在c语言中是转义字符，所以没有输出

 

task3_2

#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;}

 

 

 task3_3

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

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;}

 

 

task4

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

 

task5

#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 ch;
    double sum;
    int i,j,q=n-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;++j){
        if(s[j].sum<s[j+1].sum){
            ch=s[j];
            s[j]=s[j+1];
            s[j+1]=ch;
        }
    }    
    }
    
    for(i=0;i<q;i++){
        if(i<=q*0.1)
        strcpy(s[i].level,"优秀"); 
        else if(i>q*0.1&&i<q*0.5)
        strcpy(s[i].level,"合格");
        else
        strcpy(s[i].level,"不合格");
    }
    
}

 

 

 task6

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 100
#define M 5

typedef struct {
    int id;
    char name[20];
    char group[20];
}STU;

void input(STU s[], int n);
void output(STU s[], int n);
int main() {
    STU stu[N];
    STU selected[M];
    
    int i,num;

    input(stu, N);

    srand(time(0));
    
    for (i = 0,num=0; i < M; ++i) {
        num = rand() % (80- 1 + 1) + 1;
        selected[i] = stu[num];
    }
    
    output(selected, M);
    
    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, "%d %s %s", &s[i].id, s[i].name, &s[i].group);
    }

    fclose(fin);
}

void output(STU s[], int n) {
    FILE* fout;
    int i;
    
    for (i = 0; i < n; i++)
        printf("%d\t%s\t%s\n", s[i].id, s[i].name, s[i].group);

    fout = fopen("selected.txt", "w");
    if (!fout) {
        printf("fail to open file\n");
        exit(0);
    }

    for (i = 0; i < n; i++)
        fprintf(fout, "%d\t%s\t%s\n", s[i].id, s[i].name, &s[i].group);

    fclose(fout);
}

 

 

标签：fp,int,char,实验,printf,include,define
From： https://www.cnblogs.com/zyyjl/p/17467221.html

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