fix sample

lab-4/samples/sorting-snippet.cbl

@@ -48,7 +48,7 @@ PROCEDURE DIVISION.
     PERFORM VARYING WS-INDEX FROM 1 BY 1
         UNTIL WS-INDEX > WS-SORT-MAX
         DISPLAY "Element " WS-INDEX ": " WS-SORT-ROW(WS-INDEX)
-    END-PERFORM.
+    END-PERFORM
 
     STOP RUN.
     

lab-5/Makefile

@@ -20,7 +20,7 @@ scanner.c: scanner.flex parser.h
 	flex -oscanner.c scanner.flex
 
 parser.c parser.h: parser.bison
-	bison --defines=parser.h --output=parser.c -v parser.bison -Wconflicts-sr -Wcounterexamples
+	bison --defines=parser.h --output=parser.c -v parser.bison
 
 # clean causes all intermediate files to be deleted.
 

lab-5/parser.bison

@@ -1,9 +1,35 @@
 %{
 #define YYDEBUG 1
 #include <stdio.h>
-extern int yylineno;
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "expr.h"
+
+/*
+YYSTYPE is the lexical value returned by each rule in a bison grammar.
+By default, it is an integer. In this example, we are returning a pointer to an expression.
+*/
+
+#define YYSTYPE struct expr *
+
+/*
+Clunky: Manually declare the interface to the scanner generated by flex. 
+*/
+
+extern char *yytext;
+extern int yylex();
 void yyerror(const char*);
-int yylex();
+
+/*
+Clunky: Keep the final result of the parse in a global variable,
+so that it can be retrieved by main().
+*/
+
+struct expr * parser_result = 0;
+
+
+extern int yylineno;
 %}
 
 %debug
@@ -63,7 +89,9 @@ int yylex();
 
 
 %%
-file            : statements     
+program         : statements      
+                    { parser_result = $1; return 0;}
+                ;
 statements      : statement_list
                 ;
 statement_list  : statement_list statement