fix bugs

Author: AprilKK

SLLst.cpp

@@ -0,0 +1,33 @@
+#include "SLLst.h"
+#include <iostream>
+
+template <class T>
+SLLst<T>::~SLLst() {
+    for (SLLstNode * p;!isEmpty();) {
+    	p=head->next;
+    	delet head;
+        head=p;
+    }
+}
+template <class T>
+SLLst<T>::addToHead(const T & el) {
+    head=new SLLstNode(el,head);
+    if(tail == 0)
+    	tail=head;
+}
+template <class T>
+T SLLst<T>::deletFromTail() {
+	T el = tail->info;
+	if (head == tail) {
+		delete head;
+		head =tail =0 ;
+	}
+	else  {
+		SLLstNode * tmp;
+		for (tmp = head;tmp->next != tail ; tmp=tmp->next) ;
+			delete tail;
+		    tail =tmp;
+		    tail->next = 0;
+	}
+	return el;
+}