Initial commit

examTemplate/examTemp_modules/stack.c

@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "stack.h"
+
+struct Stack *top = NULL;
+
+int isEmpty(){
+    return (top == NULL);
+}
+
+void Push(int item){
+    struct Stack *temp = (struct Stack *) malloc(sizeof(struct Stack));
+    temp->ptr = top;
+    temp->data = item;
+    top = temp;
+}
+
+int Pop(){
+    if (top == NULL){
+        printf("Stack ist leer!\n");
+        return -1;
+    }
+    struct Stack *temp = top->ptr;
+    int popped = top->data;
+    free(top);
+    top = temp;
+    return popped;
+}
+
+int Top(){
+    if(isEmpty()) {
+        printf("Stack ist leer!\n");
+        return -1;
+    }
+    return top->data;
+}
+
+int Size(){
+    if(isEmpty())
+        return 0;
+
+    struct Stack *next = top->ptr;
+    int size = 1;
+    for (; next != NULL; next = next->ptr) {
+        size++;
+    }
+    return size;
+}