add get next calculation function

src/inputHandling.c

@@ -6,6 +6,7 @@
 
 char formulaBuffer[1000];
 calc_op* mainCalc = NULL;
+calc_op* currentCalc = NULL;
 
 void processInput(char* formStr, int len) {
     deleteWhitespace(formStr, len);
@@ -23,6 +24,14 @@ void processInput(char* formStr, int len) {
     }
 }
 
+calc_op* getNextCalc(){
+    if (currentCalc != NULL){
+        free(currentCalc);
+    }
+    currentCalc = mainCalc; // get ext calculation
+    return currentCalc;
+}
+
 //Leerzeichen löschen
 void deleteWhitespace(char* formStr, int len){
     for(int stringPos=0; stringPos < len; stringPos++){

src/inputHandling.h

@@ -10,8 +10,8 @@ op functionsType;
 char* formular;
 double inputNumbers[10];
 int arrayLength;
-void* child;
-void* parent;
+void* child[10];  // all children structs which depends on this struct
+void* parent;     // the parent struct which this struct depends on
 double result;
 }calc_op;
 
@@ -21,5 +21,6 @@ extern void deleteWhitespace(char* formStr, int len);
 extern op detectFunctionOperator(char* formStr, int len);
 extern char* getNumbers(char* formStr, int len, calc_op* formRef);
 extern void showStruct(calc_op* formRef);
+extern calc_op* getNextCalc();
 
 #endif // INPUTHANDLING_H

src/main.c

@@ -9,10 +9,15 @@
 char inputBuffer[STRING_LENGTH] = {0};
 
 void main() {
-    calc_op result;
+    calc_op *result = NULL;
     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.result = 65478;
-    showResult(&result);
+    result = getNextCalc();
+    if (result!=NULL){
+        /* Calculation*/
+        result->result = 65478;
+        showResult(result);
+    }
+
 }