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;
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例如，FILE * fptr;
File pointer = fopen (“File name”, “mode”);
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例如，fptr = fopen("sample.txt", "r");
FILE *fp;
fp = fopen (“sample.txt”, “w”);
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读取文件的语法如下 −
int fgetc( FILE * fp );// read a single character from a file
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写入文件的语法如下 −
int fputc( int c, FILE *fp ); // write individual characters to a stream
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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);
}
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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;
}
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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
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