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实验七

时间：2023-06-14 20:23:47浏览次数：33  
标签：fp return int char 实验 printf define

实验一

源码程序// 将图书信息写入文本文件data1.txt#include <stdio.h>#define N 7#define M 80typedef 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;
// 以写的方式打开文本文件data1.txt
fp = fopen("data1.txt", "w");
// 如果打开文件失败，输出提示信息并返回
if(fp == NULL) {
printf("fail to open file\n");
return 1;
}
// 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;
｝

运行结果

 

实验1.2

源码程序

// 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]; // 书名
char author[M]; // 作者
} Book;
int main() {
Book x[N];
int i, n;
FILE *fp;
// 以读的方式打开文本文件data1.txt
fp = fopen("data1.txt", "r");
// 如果打开文件失败，输出提示信息并返回
if(fp == NULL) {
printf("fail to open file\n");
return 1;
} // 从文件中读取图书信息，保存到结构体数组x中
i = 0;
while(!feof(fp)) {
fscanf(fp, "%s%s", x[i].name, x[i].author);
++i;
} n
= i - 1;
// 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;
}

运行结果 

 

实验2.1

源码程序

// 将图书信息写入二进制文件data2.dat
#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;
// 以写的方式打开二进制文件data2.dat
fp = fopen("data2.dat", "wb");
// 如果打开文件失败，输出提示信息并返回
if(fp == NULL) {
printf("fail to open file\n");
return 1;
} // 将结构体数组x中的图书信息以数据块方式写入文件data2.dat
fwrite(x, sizeof(Book), N, fp);
fclose(fp);
return 0;
｝

 

实验2.2

源码程序

// 从二进制文件data2.dat读取图书信息，并打印输出到屏幕
#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];
int i;
FILE *fp;
// 以读的方式打开二进制文件data2.dat
fp = fopen("data2.dat", "rb");
// 如果打开文件失败，输出提示信息并返回
if(fp == NULL) {
printf("fail to open file\n");
return 1;
} // 从文件data2.dat以数据块方式读入图书信息数据到结构体数组x
fread(x, sizeof(Book), N, fp);
// 在屏幕上输出结构体数组x中存储的图书信息
for(i = 0; i < N; ++i)
printf("%d. %-20s%-20s\n", i+1, x[i].name, x[i].author);
fclose(fp)；
return 0;
}

 

实验3.1

源码程序

// 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;
} f
or(i = 0; i < N; ++i) {
fputs(songs[i], fp);
fputs("\n", fp);
} f
close(fp);
return 0;
}

 

实验3.2

源码程序

// 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;
} f
or(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；
｝

 

实验3.3

源码程序

#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;
} c
h = fgetc(fp);
while(ch != EOF) {
putchar(ch);
ch = fgetc(fp);
} f
close(fp);
return 0;
｝

 

实验4

 

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>

int main()
{
    char ch;
    FILE* fp;
    int n = 0;

    fp = fopen("data4.txt", "r");

    ch = fgetc(fp);
    while (ch != EOF) {
        if (ch != ' '&& ch!='\n')
            ++n;
        ch = fgetc(fp);
    }

    printf("data4.txt中共包含的字符数：%d", n);

    fclose(fp);

    return 0;
}

 

实验五

源码程序#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);
} w
hile (!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);
} f
close(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) {
// 补足代码
// ××× 
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");
    }
    
}
}


 

实验六

 

#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,return,int,char,实验,printf,define
From： https://www.cnblogs.com/xctx688/p/17466864.html

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