diff --git a/qalculator.cpp b/qalculator.cpp
index 7951b8d..63ce31c 100644
--- a/qalculator.cpp
+++ b/qalculator.cpp
@@ -4,13 +4,14 @@
 #include <string>
 
 EvaluationOptions user_evaluation_options = default_evaluation_options;
+PrintOptions user_print_options = default_print_options;
 
 struct Output_struct {
     char * result;
     std::vector<char *> messages;
 };
 
-Output_struct qalculate(const char* input, bool exact_mode, bool interval_mode) {
+Output_struct qalculate(const char* input, bool exact_mode, bool interval_mode, bool structuring_mode) {
     // Create and prepare calculator
     Calculator* c = new Calculator();
     c->loadExchangeRates();
@@ -20,17 +21,26 @@ Output_struct qalculate(const char* input, bool exact_mode, bool interval_mode)
     std::string Input = input;
     std::string Output;
     // Check evaluation options
+    user_evaluation_options.structuring = (structuring_mode ?
+        STRUCTURING_FACTORIZE :
+        STRUCTURING_EXPAND);
     user_evaluation_options.interval_calculation = (interval_mode ?
-        INTERVAL_CALCULATION_NONE :
-        INTERVAL_CALCULATION_VARIANCE_FORMULA);
+        INTERVAL_CALCULATION_VARIANCE_FORMULA :
+        INTERVAL_CALCULATION_NONE);
     user_evaluation_options.approximation = (exact_mode ? 
         APPROXIMATION_EXACT :
         APPROXIMATION_APPROXIMATE);
+    user_print_options.number_fraction_format = (exact_mode ?
+        FRACTION_DECIMAL_EXACT :
+        FRACTION_DECIMAL);
+    user_print_options.interval_display = (interval_mode ? 
+        INTERVAL_DISPLAY_INTERVAL :
+        INTERVAL_DISPLAY_MIDPOINT);
     // Prepare output struct
     struct Output_struct output;
     memset(&output,0,sizeof(Output_struct));
     // Evaluate and record result in Output
-    Output = c->calculateAndPrint(Input,2000,user_evaluation_options);
+    Output = c->calculateAndPrint(Input,2000,user_evaluation_options,user_print_options);
     // record messages
     std::string current_msg;
     while (c->message() != NULL) {
@@ -53,7 +63,8 @@ int l_qalc(lua_State* L) {
     const char * input = luaL_checkstring(L, 1);
     bool exact_mode = lua_toboolean(L, 2);
     bool interval_mode = lua_toboolean(L, 3);
-    Output_struct output = qalculate(input, exact_mode, !interval_mode);
+    bool struct_mode = lua_toboolean(L, 4);
+    Output_struct output = qalculate(input, exact_mode, interval_mode, struct_mode);
     lua_pushstring(L, output.result);
     lua_newtable(L);
     for (int i = 0; i < output.messages.size(); i++) {
diff --git a/test.lua b/test.lua
index e8e7d89..5568a19 100644
--- a/test.lua
+++ b/test.lua
@@ -1,5 +1,9 @@
 qalculate = require("libqalculator")
-local result,messages = qalculate.qalc("sin(3 rad)")
+local result,messages = qalculate.qalc("sin(3 rad)",true,false,true)
+print(result,table.concat(messages))
+local result,messages = qalculate.qalc("4/3",true)
+print(result,table.concat(messages))
+local result,messages = qalculate.qalc("4/3",false)
 print(result,table.concat(messages))
 local result,messages = qalculate.qalc("fibonacci()")
 print(result,table.concat(messages))