>>671
>>674を参考にして作ってみたサンプル

#include <stdio.h>
#include <string.h>

int main( int argc, char *argv[] )
{
int i, j;
char buf[3] = { 0 };
char watb[10][3]={ "０", "１", "２", "３", "４", "５", "６", "７", "８", "９" };
FILE *fp;

if( ( argc < 2 ) || ( ( fp = fopen( argv[1], "r") ) == NULL ) )
return 1;

for(i=0; feof(fp) == 0; i++)
{
buf[1] = fgetc( fp );

if( buf[1] == 10 )
printf( "\n" );
else
for(j=0; j < 10; j++)
if( ( buf[1] == '0' + j ) || ( strcmp( buf, watb[j] ) == 0 ) )
printf( "%d", j );

buf[0] = buf[1];
}

return 0;
}