diff --git a/compiler.c b/compiler.c
index 6434932..7ef8322 100644
--- a/compiler.c
+++ b/compiler.c
@@ -3,6 +3,8 @@
 #include "common.h"
 #include "tokenizer.h"
 
+#include <math.h>
+
 Code*
 signedLEB128(size_t num)
 {
@@ -229,12 +231,17 @@ compile(char* buffer)
       case TOKEN_TRUE:
         break;
       case TOKEN_PI:
+        append_byte(code, F64_CONST);
+        append_f64(code, M_PI);
         break;
       case TOKEN_E:
+        append_byte(code, F64_CONST);
+        append_f64(code, M_E);
         break;
       case TOKEN_EOF:
         break;
       case TOKEN_POP:
+        append_byte(code, DROP);
         break;
       case TOKEN_DUP:
         break;
@@ -288,10 +295,13 @@ compile(char* buffer)
         append_byte(code, F64_ADD);
         break;
       case TOKEN_SUB:
+        append_byte(code, F64_SUB);
         break;
       case TOKEN_MUL:
+        append_byte(code, F64_MUL);
         break;
       case TOKEN_DIV:
+        append_byte(code, F64_DIV);
         break;
       case TOKEN_IDIV:
         break;
@@ -300,10 +310,17 @@ compile(char* buffer)
       case TOKEN_POW:
         break;
       case TOKEN_SQRT:
+        append_byte(code, F64_SQRT);
         break;
       case TOKEN_ADD1:
+        append_byte(code, F64_CONST);
+        append_f64(code, 1.0);
+        append_byte(code, F64_ADD);
         break;
       case TOKEN_SUB1:
+        append_byte(code, F64_CONST);
+        append_f64(code, 1.0);
+        append_byte(code, F64_SUB);
         break;
       case TOKEN_SIN:
         break;
diff --git a/main.c b/main.c
index bf818cf..360b4e5 100644
--- a/main.c
+++ b/main.c
@@ -27,7 +27,8 @@ main(int argc, char** argv)
   initMap();
   Code* prog = compile(buffer);
 
-  int tp = open(argv[2], O_CREAT | O_WRONLY, S_IRWXU | S_IRGRP | S_IROTH);
+  int tp =
+    open(argv[2], O_CREAT | O_WRONLY | O_TRUNC, S_IRWXU | S_IRGRP | S_IROTH);
   write(tp, prog->cells, prog->count);
   close(tp);
 
diff --git a/tokenizer.c b/tokenizer.c
index 31a0de9..0fd6159 100644
--- a/tokenizer.c
+++ b/tokenizer.c
@@ -360,14 +360,20 @@ checkKeyword(int start, int length, char* rest, TokenType type)
   return TOKEN_IDENTIFIER;
 }
 
+static char*
+currentTokenToS()
+{
+  int32_t size = tokenizer.current - tokenizer.start;
+  char* str = (char*)malloc(sizeof(size));
+  strncpy(str, tokenizer.start, size);
+  str[size] = '\0';
+  return str;
+}
+
 static TokenType
 identifierType()
 {
-  char* check;
-  int32_t size = tokenizer.current - tokenizer.start;
-  check = (char*)malloc(sizeof(size));
-  strncpy(check, tokenizer.start, size);
-  check[size] = '\0';
+  char* check = currentTokenToS();
   TokenType t = get(check);
   free(check);
   return t;
@@ -456,11 +462,7 @@ nextToken()
 void
 debug_printToken(Token t)
 {
-  char* str;
-  int32_t size = tokenizer.current - tokenizer.start;
-  str = (char*)malloc(sizeof(size));
-  strncpy(str, tokenizer.start, size);
-  str[size] = '\0';
+  char* str = currentTokenToS();
 
   switch (t.type) {
     case TOKEN_LEFT_PAREN: