Clean up old and new files

plates/circlesinglelist/circlesinglelist.cpp

@@ -185,12 +185,13 @@ bool CircleSingleList::isEmpty() const
  *
  * @return int The value held at the Node at the head of our linked list
  */
-void CircleSingleList::peek() const
+int CircleSingleList::peek() const
 {
   // If there is only one data member, a circular list node will point to itself
   if (!isEmpty())
     std::cout << "[" << tail->next->data << "] is at the top of our list\n";
   else std::cout << "Nothing to peek, our list is empty...\n";
+  return tail->next->data;
 }
 
 /** print

plates/circlesinglelist/circlesinglelist.h

@@ -13,7 +13,7 @@
 
 #include <iostream>
 
-class CircleSingleList{
+class CircleSingleList {
   public:
     CircleSingleList() : tail(NULL) {};
     CircleSingleList(const CircleSingleList& rhs);
@@ -25,7 +25,7 @@ class CircleSingleList{
     bool replace(int val, int key);
     void makeEmpty();
     bool isEmpty() const;
-    void peek() const;
+    int peek() const;
     void print() const;
     bool find(int val) const;
 

plates/cpp-datastruct/CMakeLists.txt

@@ -1,63 +0,0 @@
-###############################################################################
-## Author: Shaun reserved                                                    ##
-## Legal: All Content (c) 2020 Shaun Reed, all rights reserved               ##
-##                                                                           ##
-## Contact: shaunrd0@gmail.com	| URL: www.shaunreed.com | GitHub: shaunrd0  ##
-##############################################################################
-
-# Define the version of CMake
-cmake_minimum_required(VERSION 3.10)
-# Name and version of our project
-project(DataStruct VERSION 0.1)
-# Specify the C++ standard
-set(CMAKE_CXX_STANDARD 11)
-set(CMAKE_CXX_STANDARD_REQUIRED True)
-
-# Create path variables relative to root directory (CMAKE_SOURCE_DIR)
-set(APPS_DIR ./apps)
-set(SRC_DIR ./src)
-set(INCLUDE_DIR ./include)
-set(DRIVER_SRC ${APPS_DIR}/driver.cpp)
-set(LIB_DS_SRC ${SRC_DIR}/lib-datastruct.cpp)
-
-add_library(lib-ds ${LIB_DS_SRC})
-
-add_executable(Driver ${DRIVER_SRC})
-
-target_link_libraries(Driver PUBLIC lib-ds)
-
-target_include_directories(lib-ds PUBLIC ${INCLUDE_DIR})
-
-# configure_file(${INCLUDE_DIR}/lib-datastruct.h.in ${CMAKE_BINARY_DIR}/generated/lib-datastruct.h)
-# include_directories( ${CMAKE_BINARY_DIR}/generated/ )
-
-# # Location of our header files
-# # include_directories(./include)
-# include_directories(${PROJECT_BINARY_DIR})
-# include_directories( ${CMAKE_BINARY_DIR}/generated/ )
-
-
-# # Additional directories to expect a CMakeLists.txt
-# # add_subdirectory(src)
-# # add_subdirectory(apps)
-
-# # Configure includes to consider cmake variables
-# configure_file(${INCLUDE_DIR}/lib-datastruct.h.in ${CMAKE_BINARY_DIR}/generated/lib-datastruct.h)
-
-# # /apps/CMakeLists.txt
-# # Create a variable to reference any sources to add
-# set(LIB_DS_SRC ${SRC_DIR}/lib-datastruct.cpp)
-# # Create our library
-# add_library(lib-datastruct ${LIB_DS_SRC})
-# # Point the library to directories containing any includes it might need
-# target_include_directories(lib-datastruct PUBLIC "${INCLUDE_DIR}")
-
-# # /src/CMakeLists.txt
-# # Create a variable to reference our driver program source code
-# set(DRIVER_SRC ${APPS_DIR}/driver.cpp)
-# # Add the executable to the build list
-# add_executable(Driver ${DRIVER_SRC})
-# # Link custom libraries to our executable
-# target_link_libraries(Driver lib-datastruct)
-
-# # target_include_directories(Driver PUBLIC "${INCLUDE_DIR}")

plates/cpp-datastruct/apps/CMakeLists.txt

@@ -1,15 +0,0 @@
-###############################################################################
-## Author: Shaun reserved                                                    ##
-## Legal: All Content (c) 2020 Shaun Reed, all rights reserved               ##
-##                                                                           ##
-## Contact: shaunrd0@gmail.com	| URL: www.shaunreed.com | GitHub: shaunrd0  ##
-##############################################################################
-
-# # Create a variable to reference our source code
-# set(DRIVER_SRC driver.cpp)
-
-# # Add the executable to the build list
-# add_executable(driver ${DRIVER_SRC})
-
-# # Link custom libraries to our executable
-# target_link_libraries(driver lib-datastruct)

plates/cpp-datastruct/apps/driver.cpp

@@ -1,170 +0,0 @@
-#include <lib-datastruct.h>
-#include <iostream>
-
-// StackArray menu
-void Stack();
-
-void List();
-
-// Main menu
-int main ()
-{
-  // std::cout << "Running driver program version " << DS_VERSION;
-  enum OPS {
-    EXIT, LISTS, STACKS, QUEUES
-  };
-
-  bool exit = false;
-  int choice;
-  while (!exit) {
-    std::cout << "\n##### Main Menu #####\n"
-      << "Enter a choice below...\n\t0. Exit"
-      << "\n\t1. Lists\n\t2. Stacks\n\t3. Queues\n";
-    std::cin >> choice;
-    std::cin.clear();
-
-    switch (choice) {
-    case EXIT: // 0
-      exit = true;
-      break;
-    
-    case LISTS: // 1
-      List();
-      break;
-    
-    case STACKS: // 2
-      Stack();
-      break;
-    
-    case QUEUES: // 3
-      break;
-
-    default:
-      std::cout << "Invalid option selected\n";
-      break;
-    }
-  }
-
-  return 0;
-}
-
-// LinkedList menu
-void List()
-{
-  enum LIST_OPS {
-    EXIT, APPEND, PUSH, DEQUEUE, POP, DISPLAY
-  };
-  bool exit = false;
-  int choice;
-  char val;
-  LinkedList list;
-
-  while(!exit) {
-    std::cout << "\n##### LinkedList Menu #####\n"
-       << "Enter a choice below...\n\t0. Exit"
-       << "\n\t1. Append\n\t2. Push\n\t3. Dequeue\n\t4. Pop"
-       << "\n\t5. Display\n\t6. Find\n\t7. Remove\n";
-    std::cin >> choice;
-    std::cin.clear();
-    switch(choice) {
-      case EXIT: // 0
-        exit = true;
-        break;
-
-      case APPEND: // 1
-        std::cout << "Enter a character to append to our list: ";
-        std::cin >> val;
-        std::cin.clear();
-        list.Append(val);
-        break;
-
-      case PUSH: // 2
-        std::cout << "Enter a character to push to our list: ";
-        std::cin >> val;
-        std::cin.clear();
-        list.Push(val);
-        break;
-      
-      case DEQUEUE: // 3
-        std::cout << "Enter a value to remove from the list: ";
-        std::cin >> val;
-        std::cin.clear();
-        list.Remove(val);
-        break;
-
-      case POP: // 4
-        // list.Pop();
-        list.Append('a');
-        Node *tem = list.Find('a');
-        list.Remove('a');
-        if (tem != NULL) {
-          std::cout << "Found [" << tem->data << "] within the list\n";
-        }
-        delete tem;
-        break;
-
-      case DISPLAY: // 5
-        list.Display();
-        break;
-
-      default:
-        std::cout << "Invalid option selected\n";
-        break;
-    }
-  }
-
-  return;
-}
-
-// StackArray menu
-void Stack()
-{
-  enum STACK_OPS {
-    EXIT, PUSH, POP, TOP, DISPLAY
-  };
-
-  StackArray stack;
-  bool exit = false;
-  int choice;
-  while (!exit) {
-    std::cout << "\n##### StackArray Menu #####\n"
-      << "Enter a choice below...\n\t0. Exit"
-      << "\n\t1. Push\n\t2. Pop\n\t3. Top\n\t4. Display\n";
-    std::cin >> choice;
-    std::cin.clear();
-
-    switch (choice) {
-    case EXIT: // 0
-      exit = true;
-      break;
-
-    case PUSH: // 1
-      char val;
-      std::cout << "Enter a character to push to our stack: ";
-      std::cin >> val;
-      std::cin.clear();
-      stack.Push(val);
-      break;
-    
-
-    case POP: // 2
-      std::cout << "[" << stack.Pop() << "] has been removed from our stack\n";
-      break;
-    
-
-    case TOP: // 3
-      std::cout << "[" << stack.Top() << "] is at the top of our stack\n";
-      break;
-    
-
-    case DISPLAY: // 4
-      stack.Display();
-      break;
-    
-    default:
-      std::cout << "Invalid option selected\n";
-      break;
-    }
-  }
-  
-}

plates/cpp-datastruct/include/lib-datastruct.h

@@ -1,48 +0,0 @@
-#ifndef LDS_H
-#define LDS_H
-
-#include <iostream>
-
-class Node {
-  public:
-    Node() : next(NULL) {};
-    Node(char val) : data(val), next(NULL) {};
-    char data;
-    Node *next;
-};
-
-// Linked list
-
-class LinkedList {
-
-  public:
-    LinkedList() : head(NULL), tail(NULL) {};
-    void Append(char val);
-    void Push(char val);
-    void Remove(char val);
-    void Replace(char remove, char replace);
-    void Display() const;
-    bool isEmpty() const;
-    Node* Find(char val) const;
-  private:
-    Node *head, *tail;
-};
-
-// Array based stack
-
-class StackArray {
-  public:
-    StackArray() : top(EMPTY) {};
-    void Push(char val);
-    char Pop();
-    char Top() const;
-    void Display() const;
-    bool isEmpty() const;
-
-  private:
-    enum { EMPTY=-1, MAX=10 };
-    Node stack[MAX];
-    int top;
-};
-
-#endif

plates/cpp-datastruct/include/lib-datastruct.h.in

@@ -1,8 +0,0 @@
-// #ifndef LDS_H
-// #define LDS_H
-
-#define DS_VERSION_MINOR @DataStruct_VERSION_MINOR@
-#define DS_VERSION_MAJOR @DataStruct_VERSION_MAJOR@
-#define DS_VERSION @DataStruct_VERSION@
-
-// #endif

plates/cpp-datastruct/src/CMakeLists.txt

@@ -1,12 +0,0 @@
-###############################################################################
-## Author: Shaun reserved                                                    ##
-## Legal: All Content (c) 2020 Shaun Reed, all rights reserved               ##
-##                                                                           ##
-## Contact: shaunrd0@gmail.com	| URL: www.shaunreed.com | GitHub: shaunrd0  ##
-##############################################################################
-
-# # Create a variable to reference any sources to add
-# set(LIB_DS_SRC lib-datastruct.cpp)
-
-# # Create our library
-# add_library(lib-datastruct ${LIB_DS_SRC})

plates/cpp-datastruct/src/lib-datastruct.cpp

@@ -1,172 +0,0 @@
-#include <lib-datastruct.h>
-
-// LinkedList
-
-void LinkedList::Append(char val)
-{
-  Node *temp = new Node(val);
-  
-  if (isEmpty()) {
-    this->tail = this->head = temp;
-    // head->next = tail;
-    return;
-  }
-  else {
-    tail->next = temp;
-    tail = temp;
-    return;
-  }
-}
-
-void LinkedList::Push(char val)
-{
-  Node *temp = new Node(val);
-
-  if (isEmpty())
-  {
-    this->head = this->tail = temp;
-    return;
-  }
-  else {
-    temp->next = head;
-    this->head = temp;
-    return;
-  }
-}
-
-void LinkedList::Remove(char val)
-{
-  Node *foundNode = new Node;
-  
-  if (isEmpty()) {
-    // if list is empty
-    std::cout << "Error: List is empty\n";
-    return;
-  }
-  else if (this->head->data == val) {
-    // check the head node, return if found val
-    foundNode = this->head;
-    std::cout << "[" << foundNode->data << "] has been removed from our list\n";
-    this->head = foundNode->next;
-    delete foundNode;
-    // Does this set head to NULL?
-    // this->head = NULL;
-    return;
-  }
-
-  Node *temp = head;
-  while (temp->next->data != val) {
-    temp = temp->next;
-    if (temp->next == NULL) {
-      std::cout << "Value [" << val << "] not found in our list\n";
-      return;
-    }
-  }
-  foundNode = temp->next;
-  // If we made it our of the loop, we found val at the next node
-  temp->next = foundNode->next;
-  std::cout << "[" << foundNode->data << "] has been removed from our list\n";
-  delete foundNode;
-  return;  
-}
-
-void LinkedList::Replace(char remove, char replace)
-{
-  return;
-}
-
-Node* LinkedList::Find(char val) const
-{
-  Node *foundNode(NULL);
-  Node *temp = head;
-  
-  if(isEmpty())  {
-    std::cout << "Error: The list is empty\n";
-    return foundNode;
-  }
-
-  bool found = false;
-
-  while (!found && temp->next != NULL) {
-    if(temp->next->data == val) {
-      found = true;
-      foundNode = temp->next;
-      std::cout << "[" << foundNode->data << "] has been found in our list\n";
-      // temp->next = foundNode->next;
-      // delete foundNode;
-    }
-    temp = temp->next;
-  }
-  return foundNode;
-}
-
-void LinkedList::Display() const
-{
-  Node *temp = head;
-  while (temp != NULL) {
-    std::cout << "[" << temp->data << "] | ";
-    temp = temp->next;
-  }
-  return;
-}
-
-bool LinkedList::isEmpty() const
-{
-  return this->head == NULL;
-}
-
-// StackArray
-
-void StackArray::Push(char val)
-{
-  
-  if (top < MAX && !isEmpty()) {
-    this->stack[++top].data = val;
-  }
-  else if (isEmpty()) {
-    this->stack[++top].data = val;
-  }
-  else {
-    std::cout << "Error: stack is full!\n";
-  }
-  return;
-}
-
-char StackArray::Pop() 
-{
-  
-  if (!isEmpty()) {
-    char temp = this->Top();
-    this->top -= 1;
-    return temp;
-  }
-  return '\0';
-}
-
-char StackArray::Top() const
-{
-  return this->stack[top].data;
-}
-
-void StackArray::Display() const
-{
-  if (isEmpty()) {
-    std::cout << "Error: Stack is empty\n";
-    return;
-  }
-
-  int tempTop = this->top;
-  while (tempTop >= 0) {
-    std::cout << "Value at stack [" << tempTop << "]: " 
-      << this->stack[tempTop].data << std::endl;
-    tempTop--;
-  }
-  
-  return;
-}
-
-bool StackArray::isEmpty() const
-{
-  return this->top <= EMPTY;
-}
-

plates/cpp-launcher/CMakeLists.txt

@@ -1,21 +0,0 @@
-
-###############################################################################
-## Author: Shaun Reed                                                        ##
-## Legal: All Content (c) 2019 Shaun Reed, all rights reserved               ##
-##                                                                           ##
-## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0  ##
-##############################################################################
-
-# Define the version of CMake
-cmake_minimum_required(VERSION 2.8)
-
-# Define the your project name
-project(cpp-launcher)
-
-# Include any directories the compiler may need
-include_directories(./include)
-
-# Point CMake to look for more CMakeLists within the following directories
-add_subdirectory(src)
-add_subdirectory(apps)
-

plates/cpp-launcher/apps/CMakeLists.txt

@@ -1,16 +0,0 @@
-###############################################################################
-## Author: Shaun Reed                                                        ##
-## Legal: All Content (c) 2019 Shaun Reed, all rights reserved               ##
-##                                                                           ##
-## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0  ##
-##############################################################################
-
-# Create a reference / variable to refer to our source code
-set(LAUNCHER_SRC launcher.cpp)
-
-# Add our executable, naming it and linking it to our source code
-add_executable(launcher ${LAUNCHER_SRC})
-
-# Link to our custom library, defined in c-cmake/src/
-target_link_libraries(launcher lib-launcher)
-

plates/cpp-launcher/apps/launcher.cpp

@@ -1,76 +0,0 @@
-/*#############################################################################
-## Author: Shaun Reed                                                        ##
-## Legal: All Content (c) 2019 Shaun Reed, all rights reserved               ##
-##                                                                           ##
-## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0  ##
-##############################################################################
-## launcher.cpp
-*/
-
-#include <iostream>
-#include <lib-launcher.hpp>
-
-int main () {
-  // Because the launcher is this executable.. (main() will become our exe)
-  // Initialize the user choice to launcher problem at runtime
-  int pChoice = LAUNCH;
-
-  // Cast the integer pChoice into an assignment for our Problem enum
-  // No failsafes needed here since we know pChoice = LAUNCH
-  Problem pSelect = static_cast<Problem>(pChoice);
-
-  do
-  {
-    printf("\nWelcome to the cpp launcher!\n"
-           "Input the problem number to run the example.\n");
-
-    //ProblemList(); List and explain problem selection
-    //ProblemSelect(); Select problem, handle errors, return result to &pSelect
-    
-    std::cin >> pChoice;
-    
-    if(pChoice == LAUNCH)
-    { // Ensure that pSelect = LAUNCH and restart
-    pSelect = static_cast<Problem>(pChoice);
-    std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
-    RunProblem(pSelect);
-    continue;
-    }
-    else if ( pChoice > QTY )
-    { // If we have entered a value too large, restart
-    std::printf("\nThe value you entered is too large."
-    "\nPlease enter a value below %d\n", QTY);
-    pSelect = Problem::Launch; // Set our launcher to restart and continue
-    continue;
-    }
-
-    if (!std::cin ) 
-    { // Check for cin error state
-    std::cin.clear();
-    std::cin.ignore();
-    pChoice = ERROR;
-    }
-    // One last input check for other error values
-    if (pChoice < EXIT) pChoice = ERROR;
-
-    // Cast the integer pChoice into an assignment for our Problem enum    
-    pSelect = static_cast<Problem>(pChoice);
-
-    /*
-    * We should expect a clear input buffer at this point
-    * Clear cin up to next endline to prepare for the next input
-    * Depends on include <limits> for numeric_limits<streamsize>
-    */
-    std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
-
-    // Run the problem, print exit, or print error.
-    RunProblem(pSelect); 
-
-  // Run loop until invalid or exit input recieved
-  } while (pChoice > EXIT || pChoice == LAUNCH); 
-  // Exit the launcher if the selection is in range
-  // Exit if pSelect is set to ERROR state value
-
-  return 0;
-}
-

plates/cpp-launcher/include/lib-launcher.hpp

@@ -1,37 +0,0 @@
-/*#############################################################################
-## Author: Shaun Reed                                                        ##
-## Legal: All Content (c) 2019 Shaun Reed, all rights reserved               ##
-##                                                                           ##
-## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0  ##
-##############################################################################
-## lib-launcher.hpp
-*/
-
-#include <iostream>
-#include <limits>
-
-// Define our constants
-// These are used for ranges within our control loops
-const int QTY = 5;
-const int EXIT = 0;
-const int ERROR = -1;
-const int LAUNCH = 99;
-
-/* An enumeration for use with RunProblem() when selecting which problem to run
- * This is meant to be expanded as needed.
- * Be sure to add a corresponding case within RunProblem()
- *
- * @Launcher (LAUNCH 99) the value used for the launcher as a problem number
- * @Exit (EXIT 0) is the normal exit index
- * @Error (ERROR -1) is considered an error
- */
-enum class Problem 
-{ Launch = 99, Error = -1, Exit, One, Two, Three, Four, Five };
-
-/* This function allows for selection of the next problem to run.
- *
- * @param pSelect - The index to use within our enumeration.
- *                  Allows for easy integer to problem selection.
- */
-void RunProblem(Problem pSelect);
-

plates/cpp-launcher/src/CMakeLists.txt

@@ -1,13 +0,0 @@
-###############################################################################
-## Author: Shaun Reed                                                        ##
-## Legal: All Content (c) 2019 Shaun Reed, all rights reserved               ##
-##                                                                           ##
-## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0  ##
-##############################################################################
-
-# Create any links we might need
-set(LIB_LAUNCHER_SRC lib-launcher.cpp)
-
-# Define our library within CMake and link to the source code
-add_library(lib-launcher ${LIB_LAUNCHER_SRC})
-

plates/cpp-launcher/src/lib-launcher.cpp

@@ -1,80 +0,0 @@
-/*#############################################################################
-## Author: Shaun Reed                                                        ##
-## Legal: All Content (c) 2019 Shaun Reed, all rights reserved               ##
-##                                                                           ##
-## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0  ##
-##############################################################################
-## lib-launcher.cpp
-*/
-
-#include <lib-launcher.hpp>
-
-/* This function allows for selection of the next problem to run.
- *
- * @param pSelect - The index to use within our enumeration.
- *                  Allows for easy integer to problem selection.
- */
-void RunProblem(Problem pSelect) { 
-
-  switch (pSelect) {
-    
-    case Problem::One:  
-      std::printf("\nYou are on problem 1!\n"
-      "Press enter to continue.");
-      std::cin.ignore();
-      break;
-    
-    case Problem::Two:
-      std::printf("\nYou are on problem 2!\n"
-      "Press enter to continue.");
-      std::cin.ignore();
-      break;
-    
-    case Problem::Three:
-      std::printf("\nYou are on problem 3!\n"
-      "Press enter to continue.");
-      std::cin.ignore();
-      break;
-    
-    case Problem::Four:
-      std::printf("\nYou are on problem 4!\n"
-      "Press enter to continue.");
-      std::cin.ignore();
-      break;
-    
-    case Problem::Five:
-      std::printf("\nYou are on problem 5!\n"
-      "Press enter to continue.");
-      std::cin.get();
-      break;
-
-    case Problem::Exit:
-      std::printf("\nYou are on problem 0! This is a safe exit.\n"
-      "Press enter to continue.");
-      std::cin.ignore();
-      break;
-
-    case Problem::Error:
-      std::printf("\nYou are on problem -1! This is considered and error.\n"
-      "Press enter to exit.");
-      std::cin.ignore();
-      break;
-
-    case Problem::Launch:
-      // Do nothing, break and let main() restart the launcher
-      std::printf("\nRestarting the launcher...\n"
-      "Press enter to continue.");
-      std::cin.ignore();
-      break;
-
-    default:
-      std::printf("\nYou have entered an invalid value."
-      "\nPress Enter to try again.");
-      //ProblemList();
-      break;
-
-  }
-
-  return;
-}
-

plates/singlelist/singlelist.cpp

@@ -10,11 +10,12 @@
 
 #include "singlelist.h"
 
+
 /******************************************************************************
  * Constructors, Destructors, Operators
  *****************************************************************************/
 
-/**
+/** copy constructor
  * @brief Construct a new SingleList::SingleList object from an existing one
  *
  * @param rhs SingleList object
@@ -51,7 +52,7 @@ SingleList SingleList::operator=(SingleList rhs)
   return *this;
 }
 
-/**
+/** destructor
  * @brief Destroy the SingleList::SingleList object
  */
 SingleList::~SingleList()
@@ -59,6 +60,7 @@ SingleList::~SingleList()
   makeEmpty();
 }
 
+
 /******************************************************************************
  * Public Member Functions
  *****************************************************************************/
@@ -161,11 +163,12 @@ bool SingleList::isEmpty() const
  *
  * @return int The value held at the Node pointed to by SingleList::head
  */
-void SingleList::peek() const
+int SingleList::peek() const
 {
   if (!isEmpty())
     std::cout << "[" << head->data << "] is at the top of our list\n";
   else std::cout << "Nothing to peek, our list is empty...\n";
+  return head->data;
 }
 
 /** print
@@ -197,6 +200,7 @@ bool SingleList::find(int val) const
   return true;
 }
 
+
 /******************************************************************************
  * Private Member Functions
  *****************************************************************************/

plates/singlelist/singlelist.h

@@ -13,8 +13,8 @@
 ## singlelist.h
 */
 
-#ifndef LINKEDLIST_H
-#define LINKEDLIST_H
+#ifndef SINGLELIST_H
+#define SINGLELIST_H
 
 #include <iostream>
 
@@ -30,7 +30,7 @@ class SingleList{
     bool replace(int val, int key);
     void makeEmpty();
     bool isEmpty() const;
-    void peek() const;
+    int peek() const;
     void print() const;
     bool find(int val) const;