如何用c语言读取文本文件中的多行数据

1、用fgets函数可以读取文件中某行的数据，某列数据就必须一个一个读入每行的第几个字符，再存入到一个字符串当中。
2、例程：

#include<stdioh>
#include<stringh>
void main()
{
  char a[100],b[100],c[100];
  int i=3,j=4,k=0;    //第三行，第四列
  FILE fp = fopen("datatxt","r");
  while(fgets(c,100,fp)){    //读入每行数据
    i--;
    if(i==0) strcpy(a,c);    //读到第三行数据
    b[k++]=c[j-1];        //把每行的那列字符拷到b中
  }
  b[k]=0;
  printf("第%d行数据：%s\n",i,a);
  printf("第%d列数据：%s\n",j,b);
  fclose(fp);
}

C语言可以使用fopen（）函数读取txt文本里。

示例：

#include <stdioh>

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 <stdioh>

#include <stdlibh>

void main( void )

{

FILE stream;

char buffer[81];

int  i, ch;

/ Open file to read line from: /

if( (stream = fopen( "fgetcc", "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 );

}

1通过fopen函数打开文本，例如file
fp=fopen("intxt","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 *** 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("intxt","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;
}

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