Initial commit

uebung5/aufgabe5.c

@@ -0,0 +1,140 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct list{
+    void *data;
+    struct list *ptr;
+};
+
+struct list *top = NULL;
+
+int isEmpty(){
+    return (top == NULL);
+}
+
+void Add(void *data){
+    struct list *temp = (struct list *) malloc(sizeof(struct list));
+    temp->data = data;
+    if(top == NULL){
+        temp->ptr = NULL;
+        top = temp;
+        return;
+    }
+    temp->ptr = top;
+    top = temp;
+}
+
+void *Get(int index){
+    if (top == NULL)
+        return NULL;
+
+    struct list *temp = top;
+    for (int i = 0; i <= index; i++) {
+        if (temp == NULL){
+            printf("Element ist nicht enthalten!");
+            return NULL;
+        } else if(i == index){
+            return temp->data;
+        } else{
+            temp = temp->ptr;
+        }
+    }
+    return NULL;
+}
+
+int Size(){
+    if (isEmpty())
+        return 0;
+
+    struct list *next = top->ptr;
+    int size = 1;
+    for (; next != NULL; next = next->ptr) {
+        size++;
+    }
+    return size;
+}
+
+int Contains(void *item){
+    if (top == NULL) {
+        return -1;
+    }
+    struct list *temp = top;
+    for (int i = 0; i < Size(); i++) {
+        if (temp == NULL){
+            printf("Element ist nicht enthalten!");
+            return -1;
+        } else if(item == temp->data){
+            return i;
+        } else{
+            temp = temp->ptr;
+        }
+    }
+    return -1;
+}
+
+void Remove(int index){
+    if(isEmpty())
+        return;
+
+    struct list *temp = top->ptr;
+    struct list *next = top;
+
+    if(index == 0){
+        free(top);
+        top = temp;
+        return;
+    }
+
+    for(int i = 1; i <= index; i++){
+        if (temp == NULL)
+            return;
+        else if (i == index){
+            next->ptr = temp->ptr;
+            free(temp);
+            return;
+        } else
+            next = temp;
+            temp = temp->ptr;
+    }
+}
+
+int main(){
+    // Befüllung mit verschiedenen Daten
+    int number1 = 255;
+    int number2 = rand() % 500;
+    int number3 = rand() % 500;
+    int number4 = rand() % 500;
+    int number5 = rand() % 500;
+
+    Add(&number1);
+    Add(&number2);
+    Add(&number3);
+    Add(&number4);
+    Add(&number5);
+
+    // Ausgabe der Liste
+    printf("%s%d\n", "Item 0: ", *(int *) Get(0));
+    printf("%s%d\n", "Item 1: ", *(int *) Get(1));
+    printf("%s%d\n", "Item 2: ", *(int *) Get(2));
+    printf("%s%d\n", "Item 3: ", *(int *) Get(3));
+    printf("%s%d\n", "Item 4: ", *(int *) Get(4));
+
+    // Contains Überprüfung
+    if(Contains((void *) 255) != -1)
+        printf("%d", "Die Zahl 255 ist am Index: ", Contains((void *) 255));
+
+    // Size von list
+    printf("Anzahl der Elemente in der Liste: ");
+    printf("%d\n", Size( ));
+
+    // Removetest
+    Remove(0);
+    Remove(4);
+    printf("%s%d\n", "Item 0: ", *(int *) Get(0));
+    printf("%s%d\n", "Item 1: ", *(int *) Get(1));
+    printf("%s%d\n", "Item 2: ", *(int *) Get(2));
+    printf("%s%d\n", "Item 3: ", *(int *) Get(3));
+    printf("%s%d\n", "Item 4: ", *(int *) Get(4));
+
+}