add yacc programs

2 files changed, 44 insertions, 0 deletions

diff --git a/6/main.l b/6/main.l
new file mode 100644
index 0000000..55dac30
--- /dev/null
+++ b/6/main.l
@@ -0,0 +1,16 @@
+%{
+#include "y.tab.h"
+#include <stdlib.h>
+%}
+
+%%
+
+a return A;
+b return B;
+. return yytext[0];
+\n return 0;
+%%
+
+int yywrap() {
+    return 1;
+}
diff --git a/6/main.y b/6/main.y
new file mode 100644
index 0000000..25005df
--- /dev/null
+++ b/6/main.y
@@ -0,0 +1,28 @@
+%{
+#include <stdio.h>
+#include <stdlib.h>
+int yylex();
+int yyerror(char *);
+%}
+
+%token A B ERR
+
+%%
+
+S:
+ A S B
+ |
+ ;
+
+%%
+
+int yyerror(char *s) {
+    printf("error: %s", s);
+    exit(0);
+}
+
+int main() {
+    yyparse();
+    printf("valid string\n");
+    return 0;
+}