diff --git a/src/inputHandling.c b/src/inputHandling.c
index e9d8217..e202cd7 100644
--- a/src/inputHandling.c
+++ b/src/inputHandling.c
@@ -5,30 +5,49 @@
 
 
 char formulaBuffer[1000];
-calc_op* mainCalc = NULL;
+calc_op* resultCalc = NULL;
 calc_op* currentCalc = NULL;
 
 void processInput(char* formStr, int len) {
     deleteWhitespace(formStr, len);
-    if (mainCalc!=NULL){
-        free(mainCalc);
+    if (resultCalc != NULL){
+        free(resultCalc);
     }
-    mainCalc = malloc(sizeof(calc_op));
+    resultCalc = malloc(sizeof(calc_op));
+    memset(resultCalc, 0, sizeof(calc_op));
+    resultCalc->functionsType = opResult;
     memcpy(formulaBuffer, formStr, len);
-    mainCalc->formular = formStr;
-    mainCalc->functionsType = detectFunctionOperator(formulaBuffer, 10);
-    if (getNumbers(formulaBuffer, len, mainCalc) == NULL){
-        showStruct(mainCalc);
+    calc_op * nextCalc = NULL;
+    nextCalc= malloc(sizeof(calc_op));
+    memset(nextCalc, 0, sizeof(calc_op));
+    nextCalc->formular = formStr;
+    nextCalc->parent = (void*) resultCalc;
+    nextCalc->functionsType = detectFunctionOperator(formulaBuffer, 10);
+    if (getNumbers(formulaBuffer, len, nextCalc) == NULL){
+        resultCalc->children[0] = (void*) nextCalc;
+        showStruct(nextCalc);
     } else {
-        printf("Formular %s not supported", mainCalc->formular);
+        printf("Formular %s not supported", resultCalc->formular);
     }
 }
 
 calc_op* getNextCalc(){
+    calc_op* newCalc = NULL;
     if (currentCalc != NULL){
+        newCalc = (calc_op*) currentCalc->parent;
+        if (newCalc == NULL) {
+            return NULL;
+        }
+        newCalc->inputNumbers[0]= currentCalc->result;
         free(currentCalc);
+    } else {
+        newCalc = (calc_op*) resultCalc->children[0];
+    }
+    if (newCalc==NULL){
+        return NULL;
     }
-    currentCalc = mainCalc; // get ext calculation
+    currentCalc = newCalc; // get ext calculation
+    showStruct(currentCalc);
     return currentCalc;
 }
 
diff --git a/src/inputHandling.h b/src/inputHandling.h
index 1772592..76b969f 100644
--- a/src/inputHandling.h
+++ b/src/inputHandling.h
@@ -2,7 +2,7 @@
 #define INPUTHANDLING_H
 
 typedef enum{
-    opAdd, opSub, opDiv, opMult, opExp, opLog, opEmpty, opNotSupported
+    opAdd, opSub, opDiv, opMult, opExp, opLog, opEmpty, opNotSupported, opResult
 }op;
 
 typedef struct {
diff --git a/src/main.c b/src/main.c
index ac2fea4..0feff4c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -13,11 +13,18 @@ void main() {
     printf("Geben Sie eine Rechenoperation ein (Bsp.: 1+1):\n");
     fgets(inputBuffer, STRING_LENGTH, stdin);     //fgets statt scanf, holt den kompletten String inkl. Whitespace
     processInput(inputBuffer, strlen(inputBuffer));
-    result = getNextCalc();
-    if (result!=NULL){
+    do {
+        result = getNextCalc();
+        if (result == NULL) {
+            break;
+        }
+        if (result->functionsType==opResult) {
+            result->result = result->inputNumbers[0];
+            showResult(result);
+            break;
+        }
         /* Calculation*/
         result->result = 65478;
-        showResult(result);
-    }
-
+    } while (1);
+    result = getNextCalc();
 }
diff --git a/test/test_inputHandling.c b/test/test_inputHandling.c
index 404d840..c8c9665 100644
--- a/test/test_inputHandling.c
+++ b/test/test_inputHandling.c
@@ -149,4 +149,19 @@ void test_inputHandling_getNumbersDivFormular(void)
     TEST_ASSERT_EQUAL_DOUBLE(5.0, formula.inputNumbers[1]);
     TEST_ASSERT_EQUAL_INT(2, formula.arrayLength);
 }
+
+void test_inputHandling_getNextCalc(void)
+{
+    calc_op* pnt = NULL;
+    char add[] = "4+5";
+    processInput(add, 3);
+    pnt = getNextCalc();
+    TEST_ASSERT_NOT_NULL(pnt);
+    TEST_ASSERT_TRUE(pnt->functionsType == opAdd);
+    pnt = getNextCalc();
+    TEST_ASSERT_NOT_NULL(pnt);
+    TEST_ASSERT_TRUE(pnt->functionsType == opResult);
+    pnt = getNextCalc();
+    TEST_ASSERT_NULL(pnt);
+}
 #endif // TEST