// originally from w1/a1.c, modified to use disp() macro
//
#include <stdio.h>
#include <limits.h>

// # is preproc stringify operator
//
#define disp( what, format) printf( #what " = " format "\n", what)

int main(void)
{
  // printf( " LONG_MAX = %li\n", LONG_MAX);

  disp( LONG_MAX, "%li");

/* improved:
  char *fname = "/etc/shadow";
  errno = 0;
  FILE *fp = fopen(fname,"r");
  int e = errno;
  if( fp == 0) { perror(fname); return 1; }
  printf( "errno = %i\n", e);
  int c = fgetc(fp);
  printf( "c = %i\n", c);
*/

  return 0;
}

/* sample run:

$ alias GCC
gcc -std=c11 -pedantic -Wall
$ GCC -E a1.c | grep LONG_MAX
  printf( "LONG_MAX" " = " "%li" "\n", 0x7fffffffffffffffL);
$ GCC a1.c
$ ./a.out
LONG_MAX = 9223372036854775807
$

*/