wip

numbers.c

@@ -31,7 +31,9 @@ void createchecknumber(unsigned int len, unsigned int numbers[])
 
     do
     {
-      unsigned int value = (rand() % (len * 2) + 1);
+      unsigned int value = 0;
+      value = (rand() % (len * 2) + 1);
+
       same = 0;
 
       for (unsigned int j = 0; j < i; j++)
@@ -54,11 +56,6 @@ void createchecknumber(unsigned int len, unsigned int numbers[])
 
 unsigned int *createNumbers(unsigned int len)
 {
-  if (len <= 2) //sonst Index-Auswahl-Dauerschleife
-  {
-    return NULL;
-  }
-
   if (RANDOM_SEED == 0)
   {
     srand(time(NULL));
@@ -71,7 +68,7 @@ unsigned int *createNumbers(unsigned int len)
   unsigned int *numbers = malloc(sizeof(unsigned int) * len);
   if (numbers == NULL)
   {
-    return NULL; 
+    return 0;
   }
 
   createchecknumber(len, numbers);
@@ -81,6 +78,9 @@ unsigned int *createNumbers(unsigned int len)
 
   do
   {
+    i = 0;
+    j = 0;
+
     i = rand() % len;
     j = rand() % len;
 
@@ -89,6 +89,7 @@ unsigned int *createNumbers(unsigned int len)
   numbers[i] = numbers[j];
 
   return numbers;
+
 }
 
 void sortnumbers(unsigned int numbers[], unsigned int len)
@@ -108,14 +109,9 @@ void sortnumbers(unsigned int numbers[], unsigned int len)
   }
 }
 
-
+// Returns only the only number in numbers which is present twice. Returns zero on errors.
 unsigned int getDuplicate(const unsigned int numbers[], unsigned int len)
 {
-  if (numbers == NULL || len < 2) // sonst Index-Auswahl-Dauerschleife
-  {
-    return 0;
-  }
-
   unsigned int *copynumbers = malloc(sizeof(unsigned int) * len);
   if (copynumbers == NULL)
   {
@@ -131,15 +127,15 @@ unsigned int getDuplicate(const unsigned int numbers[], unsigned int len)
 
   for (unsigned i = 0; i < len - 1; i++)
   {
-    if (copynumbers[i] == copynumbers[i + 1])
+    if (copynumbers[i] == copynumbers[i+1])
     {
       unsigned int a = copynumbers[i];
-      free(copynumbers);
+      free (copynumbers);
       return a;
     }
   }
 
-  free(copynumbers);
+  free (copynumbers);
 
   return 0;
 }

stack.c

@@ -8,9 +8,29 @@
     * `clearStack`: gibt den gesamten Speicher frei. */
 
 // Pushes data as pointer onto the stack.
+static StackNode *createEmptyElement()
+{
+    return malloc(sizeof(StackNode));
+}
 StackNode *push(StackNode *stack, void *data)
 {
-
+    StackNode *newElement = createEmptyElement();
+    newElement->data = data;
+    newElement->next = NULL;
+    if (stack == NULL)
+    {
+        stack = newElement;
+    }
+    else
+    {
+        StackNode *currentElement = stack;
+        while(currentElement->next != NULL)
+        {
+            currentElement = currentElement->next;
+        }
+        currentElement->next = newElement;
+    return stack;
+    }
 }
 
 // Deletes the top element of the stack (latest added element) and releases its memory. (Pointer to data has to be

stack.h

@@ -8,6 +8,11 @@ The latest element is taken from the stack. */
 #include <stdlib.h>
 
 //TODO: passenden Datentyp als struct anlegen
+typedef struct node
+{
+    void *data;
+    struct node* next;
+}StackNode;
 
 // Pushes data as pointer onto the stack.
 StackNode *push(StackNode *stack, void *data);

test_stack.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "stack.h"
+
+void testPushAddsElementCorrectly(void)
+{
+    int a = 10;
+    StackNode *node = push(NULL, &a);
+
+    TEST_ASSERT_NOT_NULL(node);
+    TEST_ASSERT_EQUAL_INT(a, *((int*)node->data)); //void Zeiger in integer-Zeiger umwandeln
+}
+
+int main(void)
+{
+    UNITY_BEGIN();
+    RUN_TEST(testPushAddsElementCorrectly);
+    return UNITY_END();
+}