C语言文件 *** 作，要读取一个txt文件内容，应该怎么做？

//data.txt文件内容如下\x0d\x0a\x0d\x0a1个猪\x0d\x0a2个猪\x0d\x0a3个猪\x0d\x0a4个猪\x0d\x0a5个猪\x0d\x0a6个猪\x0d\x0a7个猪\x0d\x0a8个猪\x0d\x0a\x0d\x0a//运行结果一\x0d\x0athe 8 line :8 个 猪\x0d\x0a\x0d\x0aPress any key to continue \x0d\x0a//运行结果二\x0d\x0aout of range!\x0d\x0aPress any key to continue \x0d\x0a\x0d\x0a//代码如下\x0d\x0a#include \x0d\x0a#include \x0d\x0a#include \x0d\x0amain(void)\x0d\x0a{\x0d\x0aint lid,cnt=0,flag=0\x0d\x0achar buf[100]="\0"\x0d\x0aFILE *fp\x0d\x0a\x0d\x0asrand((unsigned)time(NULL))\x0d\x0afp=fopen("data.txt","r")\x0d\x0alid= rand()%10+1\x0d\x0awhile (fgets(buf,99,fp)!=NULL)\x0d\x0a{\x0d\x0aif(cnt==lid)\x0d\x0a{\x0d\x0aprintf("the %d line :%s\n",lid+1,buf)\x0d\x0aflag=1\x0d\x0abreak\x0d\x0a}\x0d\x0acnt++\x0d\x0a}\x0d\x0aif (flag==0)\x0d\x0a{\x0d\x0aprintf("out of range!\n")\x0d\x0a}\x0d\x0a}

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 )

}

如果预知前面的是英文后面的是中文，即可分开：

#include<stdio.h>

#define N 100

void main() { FILE *fpchar s[256],y[N][20],h[N][20]int i,n

if ( fp=fopen("c:\\data\\text.txt","r") ) {

  n=0

  while ( !feof(fp) ) {

    fgets(s,256,fp)sscanf("%s%s",y[n],h[n])n++if ( n>=N ) break

  }

  fclose(fp)

  printf("英文: ")for ( i=0i<ni++ ) printf("%s ",y[i])printf("\n")

  printf("中文: ")for ( i=0i<ni++ ) printf("%s ",h[i])printf("\n")

} else printf("无法打开文件读取。\n")

}

如果中英文顺序不一定，且不会有中英文混合单词：

#include<stdio.h>

#include<string.h>

#define N 100

void main() { FILE *fpchar s[256],y[N][20],h[N][20]int i,n

if ( fp=fopen("c:\\data\\text.txt","r") ) {

  n=0

  while ( !feof(fp) ) {

    fgets(s,256,fp)sscanf("%s%s",y[n],h[n])

    if ( y[n][0]<0 ) { strcpy(s,y[n])strcpy(y[n],h[n])strcpy(h[n],s)} //汉字字符ASCII码小于0

    n++if ( n>=N ) break

  }

  fclose(fp)

  printf("英文: ")for ( i=0i<ni++ ) printf("%s ",y[i])printf("\n")

  printf("中文: ")for ( i=0i<ni++ ) printf("%s ",h[i])printf("\n")

} else printf("无法打开文件读取。\n")

}

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