c语言21 天书第二天的程序清单，怎么才能编译出来，错在哪里呢？求大侠赐教，感激不尽！
/* print_it.c-This program prints a listing with line numbers! */ #include <stdlib.h>
#include <stdio.h>
void do_heading(char *filename);
int line = 0, page = 0;
int main( int argv, char *argc[] )
{
char buffer [256];
FILE *fp;
if( argv < 2 )
{
fprintf(stderr, "\nproper usage is: " );
fprintf(stderr, "\n\nprint_it filename.ext\n" );
return(1);
}
if (( fp = fopen( argc[1], "r" )) == NULL )
{
fprintf( stderr, "Error opening file, %s!", argc[1]);
return(1);
}
page = 0;
line = 1;
do_heading( argc[1]);
while( fgets(buffer, 256, fp ) != NULL )
{
if( line % 55 == 0 )
do_heading( argc[1] );
fprintf( stdout, "%4d:\t%s", line++, buffer );
}
fprintf( stdout, "\f" );
fclose(fp);
return 0;
}
void do_heading( char *filename )
{
page++;
if (page > 1)
fprintf( stdout, "\f" );
fprintf( stdout, "page: %d, %s\n\n", page, filename );
}
