c 如何读文件

在C语言开发中，想要读入一个文件。C语言可以使用FILE文件 *** 作进行读取。下面小白就来简单说说C语言如何读取一个txt文件。

C语言读取步骤一：首先需要以写入的方式打开一个空白的texr.txt文件。FILE*fpWrite=fopen("text.txt&quot；"w")

C语言读取步骤二：打开以后，继续进行循环写入0到9的 *** 作。代码。

C语言读取步骤三：完成文件写入 *** 作后，一定要记得对打开文件进行关闭 *** 作。

C语言读取步骤四：接下来对文件中写入数据的读取。首先需要创建一个用于保存读取数据的数组。

C语言读取步骤五：创建好数组以后，以读取的方式对text.txt文件进行打开 *** 作。

C语言读取步骤六：最后，将读取到的数据循环保存的创建好的数组中，并且将其显示到控制台中。

C语言可以使用fopen（）函数读取txt文本里。

示例：

#include <stdio.h>

FILE *stream, *stream2

void main( void )

{

int numclosed

/* Open for read (will fail if file "data" does not exist) */

if( (stream  = fopen( "data", "r" )) == NULL )

printf( "The file 'data' was not opened\n" )

else

printf( "The file 'data' was opened\n" )

/* Open for write */

if( (stream2 = fopen( "data2", "w+" )) == NULL )

printf( "The file 'data2' was not opened\n" )

else

printf( "The file 'data2' was opened\n" )

/* Close stream */

if(fclose( stream2 ))

printf( "The file 'data2' was not closed\n" )

/* All other files are closed: */

numclosed = _fcloseall( )

printf( "Number of files closed by _fcloseall: %u\n", numclosed )

}

扩展资料

使用fgetc函数

#include <stdio.h>

#include <stdlib.h>

void main( void )

{

FILE *stream

char buffer[81]

int  i, ch

/* Open file to read line from: */

if( (stream = fopen( "fgetc.c", "r" )) == NULL )

exit( 0 )

/* Read in first 80 characters and place them in "buffer": */

ch = fgetc( stream )

for( i=0(i <80 ) &&( feof( stream ) == 0 )i++ )

{

buffer[i] = (char)ch

ch = fgetc( stream )

}

/* Add null to end string */

buffer[i] = '\0'

printf( "%s\n", buffer )

fclose( stream )

}

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