編寫一個C程式來列印所有檔案和資料夾

檔案是記錄的集合（或）硬碟上永久儲存資料的地方。

透過使用C指令，我們可以以不同的方式存取檔案。

檔案操作

以下是C程式語言中可以執行的檔案操作：

• #命名檔案
• 開啟檔案
• 從檔案中讀取
• 向檔案中寫入
• 關閉檔案

#語法

開啟和命名檔案的語法如下：

FILE *File pointer;

例如，FILE * fptr;

File pointer = fopen (“File name”, “mode”);

例如，fptr = fopen("sample.txt", "r");

FILE *fp;
fp = fopen (“sample.txt”, “w”);

讀取檔案的語法如下−

int fgetc( FILE * fp );// read a single character from a file

寫入檔案的語法如下−

int fputc( int c, FILE *fp ); // write individual characters to a stream

The logic that we use to display the files and folders in current directory, where the program saved is explained below −

dr = opendir(".");
if(dr!=NULL){
   printf("List of Files & Folders:-</p><p>");
   for(d=readdir(dr); d!=NULL; d=readdir(dr)){
      printf("%s</p><p>", d->d_name);
   }
   closedir(dr);
}

Example

Following is the C program for printing the files and folders in a directory −

#include<stdio.h>
#include<conio.h>
#include<dirent.h>
int main() {
   struct dirent *d;
   DIR *dr;
   dr = opendir(".");
   if(dr!=NULL) {
      printf("List of Files & Folders:-</p><p>");
      for(d=readdir(dr); d!=NULL; d=readdir(dr)) {
         printf("%s</p><p>", d->d_name);
      }
      closedir(dr);
   }
   else
   printf("</p><p>error while opening the directory!");
   getch();
   return 0;
}

輸出

當上述程式被執行時，它產生以下輸出：

List of Files & Folders:-
.
..
accessing array.c
accessing array.exe
accessing array.o
bhanu.txt
C Programs
convert 2 digit no into english word.c
convert 2 digit no into english word.exe
convert 2 digit no into english word.o
DATA
delete vowels in string.c
delete vowels in string.exe
delete vowels in string.o
emp.txt
EVEN
ex.c
ex.exe
ex.o
example pro.c
example pro.exe
example pro.o
fibbinoci serie.c
fibbinoci serie.exe
fibbinoci serie.o
file
file example1.c
file example1.exe
file example1.o
file example2.c
file example2.exe
file example2.o
implicit conversion.c
implicit conversion.exe
implicit conversion.o
leap year.c
leap year.exe
leap year.o
little n big endian.c
little n big endian.exe
little n big endian.o
work out examples

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