Simple calculator assignment

1 files changed, 40 insertions, 0 deletions

diff --git a/sem1/osc/mm11/regn/regn.l b/sem1/osc/mm11/regn/regn.l
new file mode 100644
index 0000000..bbaadb8
--- /dev/null
+++ b/sem1/osc/mm11/regn/regn.l
@@ -0,0 +1,40 @@
+%{
+#include <math.h>
+#include <string.h>
+#include "symtab.h"
+#include "regn.tab.h"
+%}
+
+realtal      ([0-9]+|([0-9]*\.[0-9]+))([eE][-+]?[0-9]+)?
+var_begin	 let
+op_log		 log
+op_exp		 exp
+op_sqrt		 sqrt
+var			 [A-Za-z][A-Za-z0-9]*
+
+%%
+{realtal}      {yylval.dval = atof(yytext); 
+                return TAL;}
+{var_begin}	   {return VAR_BEGIN;}
+{op_log}	   {return LOG;}
+{op_exp}	   {return EXP;}
+{op_sqrt}	   {return SQRT;}
+
+{var}		   {yylval.string = strdup(yytext); return VAR;}
+
+[ \t] ;
+
+
+'$'            {return 0;} 
+
+\n|.           {return yytext[0];} 
+
+%%
+
+void init_sym()
+{
+	int  i;
+	for (i = 0; i < HASHSIZE; i++)
+		symbolarray[i] = NULL;
+}
+