stack Erklaerungen, numbers und bintree etwas angefangen

bintree.c

@@ -12,7 +12,22 @@
 // if isDuplicate is NULL, otherwise ignores duplicates and sets isDuplicate to 1 (or to 0 if a new entry is added).
 TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize, CompareFctType compareFct, int *isDuplicate)
 {
-
+    if(root == NULL){
+        TreeNode *node;
+        node = (TreeNode*)malloc(sizeof(TreeNode)); 
+        if(node == NULL){
+            return NULL; 
+        }
+        node->data = malloc(dataSize);
+        if(node->data == NULL){ 
+            free(node); 
+            return NULL; 
+        }
+        memcpy(node->data, data, dataSize);
+        node->left;
+        node->right;
+        
+    }
 }
 
 // Iterates over the tree given by root. Follows the usage of strtok. If tree is NULL, the next entry of the last tree given is returned in ordering direction.

makefile

@@ -35,8 +35,14 @@ $(program_obj_filesobj_files): %.o: %.c
 # --------------------------
 # Unit Tests
 # --------------------------
-unitTests:
-	echo "needs to be implemented"
+unitTests: stacktest
+
+
+test_stack: stacktest.o stack.o
+	$(CC) $(FLAGS) $^ -o stacktest
+
+test_stack.o:  stacktest.c
+	$(CC) -c $(FLAGS) $< -o $@
 
 # --------------------------
 # Clean

numbers.c

@@ -16,7 +16,17 @@
 // creating random numbers.
 unsigned int *createNumbers(unsigned int len)
 {
+if(len < 2)
+    return NULL;
+    
+  srand(time(NULL));
 
+  int count = 0;
+  while(count < len - 1){
+    int value = (rand() % (2 * len)) + 1;
+
+
+  }
 }
 
 // Returns only the only number in numbers which is present twice. Returns zero on errors.

stack.c

@@ -8,26 +8,52 @@
     * `clearStack`: gibt den gesamten Speicher frei. */
 
 // Pushes data as pointer onto the stack.
+
+
 StackNode *push(StackNode *stack, void *data)
 {
-
+    //Neue Node wird erstellt, Speicher wird zugewiesen
+    StackNode *newNode = (StackNode *)malloc(sizeof(StackNode));
+    if (newNode == NULL) {  
+        return NULL; 
+    }
+    //Data und der zeiger auf den nächsten Node werden zugewiesen
+    newNode->data = data;
+    newNode->next = stack;
+    return newNode;
 }
 
 // Deletes the top element of the stack (latest added element) and releases its memory. (Pointer to data has to be
 // freed by caller.)
 StackNode *pop(StackNode *stack)
 {
-
+    //Wenn Stack leer, wird NULL zurückgegeben
+    if(stack == NULL) {
+        return NULL; 
+    }  
+    //Nächster Node wird gespeichert, aktuellerr Node wird freigegeben
+    StackNode *next = stack->next;
+    free(stack);    
+    return next;
 }
 
 // Returns the data of the top element.
 void *top(StackNode *stack)
 {
-
+if(stack == NULL) {
+        return NULL; 
+    } 
+    return stack->data;
 }
 
 // Clears stack and releases all memory.
 void clearStack(StackNode *stack)
 {
-
+    //Speichert den aktuellen Node, freed ihn dann und geht zum nächsten
+    StackNode *temp;
+    while(stack != NULL) {
+        temp = stack;
+        stack = stack->next;
+        free(temp);
+    }   
 }

stack.h

@@ -8,7 +8,12 @@ The latest element is taken from the stack. */
 #include <stdlib.h>
 
 //TODO: passenden Datentyp als struct anlegen
+typedef struct{
+void *data;
+struct StackNode *next;    
 
+
+}StackNode;
 // Pushes data as pointer onto the stack.
 StackNode *push(StackNode *stack, void *data);
 

stacktest.c

@@ -0,0 +1,58 @@
+#include <stdio.h>
+#include "stack.h"
+#include <stdlib.h>
+
+
+//Funktion, um nachzuprüfen, ob Test bestanden wurde
+void check(char *msg, int expected, int actual){
+    printf("%s: ", msg);
+    printf("Erwartet: %d, Tatsächlich: %d\n", expected, actual);
+    if(expected == actual){
+        printf("Test bestanden\n");
+    }else{
+        printf("Test nicht bestanden\n");
+    }
+
+}
+//Schnappt sich oberstes Element
+int getTop(StackNode *stack){
+    void *data = top(stack);
+   return(int)data;
+
+}
+
+//Tests der einzelnen Stackfunktionen
+int main(){
+    StackNode *stack = NULL;
+    //Test push
+
+    stack = push(stack, (void*)10);
+    check("Nach Push 10", 10, getTop(stack));
+
+    stack = push(stack, (void*)20);
+    check("Nach Push 20", 20, getTop(stack));
+
+    //pop testen
+    stack = pop(stack);
+    check("Nach Pop", 10, getTop(stack));
+
+    //clearStack testen
+    clearStack(stack);
+    stack = NULL;
+    check("Nach ClearStack", 0, getTop(stack));
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+    return 0;
+}