文件是记录的集合（或者）硬盘上永久存储数据的地方。
通过使用C命令，我们可以以不同的方式访问文件。
文件操作
以下是在C编程语言中可以执行的文件操作：
- 命名文件
- 打开文件
- 从文件中读取
- 向文件中写入
- 关闭文件
语法
打开和命名文件的语法如下：
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”);
读取文件的语法如下 −
int fgetc( FILE * fp );// read a single character from a file
写入文件的语法如下 −
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:-");
for(d=readdir(dr); d!=NULL; d=readdir(dr)){
printf("%s
", d->d_name);
}
closedir(dr);
}
Example
Following is the C program for printing the files and folders in a directory −
#include#include #include int main() { struct dirent *d; DIR *dr; dr = opendir("."); if(dr!=NULL) { printf("List of Files & Folders:- "); for(d=readdir(dr); d!=NULL; d=readdir(dr)) { printf("%s
", d->d_name); } closedir(dr); } else printf("
error while opening the directory!"); getch(); return 0; }
输出
当上述程序被执行时，它产生以下输出：
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
