add yacc programs

1 files changed, 22 insertions, 0 deletions

diff --git a/10/main.l b/10/main.l
new file mode 100644
index 0000000..9962054
--- /dev/null
+++ b/10/main.l
@@ -0,0 +1,22 @@
+%{
+extern int yylval;
+%}
+
+d [0-9]+
+
+%%
+"+" return ADD;
+"-" return SUB;
+"*" return MUL;
+"/" return DIV;
+[0-9]+ {
+    yylval = atoi(yytext);
+    return NUM;
+};
+. return yytext[0];
+\n return 0;
+%%
+
+int yywrap() {
+    return 1;
+}