Display integers with no decimal points

cclox_src/scanner/object.cc

@@ -1,4 +1,5 @@
 #include "object.hh"
+#include <cstddef>
 #include <string>
 
 std::string Object::to_string() {
@@ -16,7 +17,12 @@ std::string Object::to_string() {
     }
     case ObjectType::NUMBER: {
       double val = std::get<double>(value);
-      return std::to_string(val);
+      std::string output{std::to_string(val)};
+      if (val == ((int)val)) {
+        size_t decimal_index{output.find(".")};
+        output = output.substr(0, decimal_index);
+      }
+      return output;
     }
   }
 }