From 8a57bedc04fff7a92ef6d2762cfe5fc17050f021 Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Fri, 30 Apr 2021 22:22:13 +0530
Subject: add yacc programs

---
 10/input  |  1 +
 10/main.l | 22 ++++++++++++++++++++++
 10/main.y | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+)
 create mode 100644 10/input
 create mode 100644 10/main.l
 create mode 100644 10/main.y

(limited to '10')

diff --git a/10/input b/10/input
new file mode 100644
index 0000000..fdfb61b
--- /dev/null
+++ b/10/input
@@ -0,0 +1 @@
+1+2-3*6/2
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;
+}
diff --git a/10/main.y b/10/main.y
new file mode 100644
index 0000000..f45e23f
--- /dev/null
+++ b/10/main.y
@@ -0,0 +1,33 @@
+%{
+#include <stdio.h>
+#include <stdlib.h>
+int yylex();
+int yyerror(char *);
+%}
+
+%token ADD SUB MUL DIV NUM
+%left ADD SUB MUL DIV
+
+%%
+R: E {
+    printf("result: %d", $$);
+    return 0;
+ }
+E: E ADD T { $$ = $1 + $3; }
+ | E SUB T { $$ = $1 - $3; }
+ | T
+ ;
+T: T MUL NUM { $$ = $1 * $3; }
+ | T DIV NUM { $$ = $1 / $3; }
+ | NUM { $$ = $1; }
+ ;
+%%
+
+int main() {
+    yyparse();
+}
+
+int yyerror(char *s) {
+    printf("error: %s", s);
+    exit(0);
+}
-- 
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