gcc/testsuite/gcc.dg/cpp/lexnum.c

   1 /* Copyright (C) 2000 Free Software Foundation, Inc.  */
   2
   3 /* { dg-do run } */
   4 /* { dg-options "-trigraphs" } */
   5
   6 /* Test lexing of numbers.  */
   7
   8 extern int puts (const char *);
   9 extern void abort (void);
  10 #define err(str) do { puts(str); abort(); } while (0)
  11
  12 /* Escaped newlines.  */
  13 #define foo 12\
  14 3\
  15 \
  16 4??/
  17 5
  18
  19 #if foo != 12345
  20 #error foo
  21 #endif
  22
  23 int main (int argc, char *argv[])
  24 {
  25   double a = 5.;
  26   double x = .5;
  27
  28 /* Decimal points, including initially and immediately before and
  29    after an escaped newline.  */
  30   if (a != 5)
  31     err ("a");
  32   if (x != .\
  33 5)
  34     err ("x != .5");
  35   x = 25\
  36 .\
  37 6;
  38   if (x != 25.6)
  39     err ("x != 25.6");
  40
  41   /* Test exponentials and their signs.  A buggy lexer is more likely
  42      to fail the compile, but never mind.  */
  43   if (250 != 25e+1 || 250 != 25e1 || 250 != 2500e-1)
  44     err ("exponentials");
  45
  46   /* Todo: p exponentials, and how to test preprocessing number
  47      tokenisation?  */
  48
  49   return 0;
  50 }