examples: fixes in lexcalc

* examples/c/lexcalc/parse.y: Formatting/comment changes.
(line): Don't return a value.
Print the result here, which avoids printing a value for lines with an
error.
(yyerror): Be sure to increment the pointed, not the pointer...
* examples/c/lexcalc/lexcalc.test: Check errors.
* examples/c/lexcalc/local.mk: Fix a dependency.

examples/c/lexcalc/lexcalc.test

@@ -25,3 +25,8 @@ cat >input <<EOF
 EOF
 run 0 9
 run -noerr 0 9 -p
+
+cat >input <<EOF
+(1+2) *
+EOF
+run 1 'err: syntax error, unexpected end-of-line, expecting ( or number'

examples/c/lexcalc/local.mk

@@ -23,7 +23,7 @@ check_PROGRAMS += %D%/lexcalc
 TESTS += %D%/lexcalc.test
 EXTRA_DIST += %D%/lexcalc.test
 %C%_lexcalc_SOURCES = %D%/parse.y %D%/parse.h %D%/scan.l
-%D%/lexcalc.c: $(dependencies)
+%D%/parse.c: $(dependencies)
 
 # Don't use gnulib's system headers.
 %C%_lexcalc_CPPFLAGS = -I$(top_srcdir)/%D% -I$(top_builddir)/%D%

examples/c/lexcalc/parse.y

@@ -15,8 +15,8 @@
 // Emitted on top of the implementation file.
 %code top
 {
-#include <stdio.h>  /* printf. */
-#include <stdlib.h> /* getenv. */
+#include <stdio.h>  // printf.
+#include <stdlib.h> // getenv.
 }
 
 %define api.pure full
@@ -39,7 +39,7 @@
 ;
 
 %token <int> NUM "number"
-%type <int> exp line
+%type <int> exp
 %printer { fprintf (yyo, "%d", $$); } <int>
 
 // Precedence (from lowest to highest) and associativity.
@@ -50,18 +50,18 @@
 // Rules.
 input:
   %empty
-| input line  { printf ("%d\n", $line); }
+| input line
 ;
 
 line:
-  exp EOL   { $$ = $1; }
+  exp EOL   { printf ("%d\n", $exp); }
 | error EOL { yyerrok; }
 ;
 
 exp:
-  exp "+" exp   { $$ = $1 + $3;  }
-| exp "-" exp   { $$ = $1 - $3;  }
-| exp "*" exp   { $$ = $1 * $3;  }
+  exp "+" exp   { $$ = $1 + $3; }
+| exp "-" exp   { $$ = $1 - $3; }
+| exp "*" exp   { $$ = $1 * $3; }
 | exp "/" exp
   {
     if ($3 == 0)
@@ -72,15 +72,15 @@ exp:
     else
       $$ = $1 / $3;
   }
-| "(" exp ")"   { $$ = $2;       }
+| "(" exp ")"   { $$ = $2; }
 | NUM           { $$ = $1; }
 ;
 %%
 // Epilogue (C code).
-void yyerror(int *nerrs, const char *msg)
+void yyerror (int *nerrs, const char *msg)
 {
   fprintf (stderr, "%s\n", msg);
-  ++nerrs;
+  ++*nerrs;
 }
 
 int main (void)