*fp=fopen("in.txt","r")//返回一个file类型的句柄
2然后就可以通过fcanf()函数对txt文本进行读取
3操作完文本之后用fclose()函数
关闭已经打开的文件。
#include
int main()
{
int data
file *fp=fopen("in.txt","r")
if(!fp)
{
printf("can't open file\n")
return -1
}
while(!feof(fp))
{
fscanf(fp,"%d",&data)
printf("%4d",data)
}
printf("\n")
fclose(fp)
return 0
}
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 )
}
