Stack Data structure

Mar 6, 2017Download as PPTX, PDF3 likes1,233 views

This document provides an overview of stacks as a data structure. It defines stacks as linear structures that store data in a last-in, first-out manner. Key points covered include common stack operations like push and pop, complexity analysis, examples of where stacks are used, and C++ code for implementing a stack class with methods like push, pop, peek, and isEmpty.

Intro to
Stack
 ADT(Abstract Data Structure).
 Based on array.
 Logically stack is linear structure.
 Data stores in top of the previous one.

Pros andCons
Advantages(Pros) are
 Insertion and deletion very quick.
 Provides LIFO(Last In First Out).
Disadvantages are
 We can not access every item in stack.
 Fixed size.
 Memory consuming.

WhereStack
are used?
 Use to Implementing recursion
 Return addresses are placed on a stack.
 For reversing string.
 Text Editors Undo/Redo feature.
 Web browser recent visited.

Complexity
 Push(insert) and pop(remove) takes constant O(1) time.
 Search takes O(n).

Operations of
Stack
 push()
 pop()
 peek()
 getSize()
 isEmpty()
 isFull()

Implementation
headerfile(Stack.h)
UsingVisual C++
 Project name is DataStructure.
 Add a class called Stack.
 In header file(Stack.h)
private:
int maxSize;
int top;
int *stack;

Implementation
Continued
header file(Stack.h)
 public:
Stack(int s);
~Stack();
void push(int value);
int pop();
int peek();
int getSize();
bool isEmpty();
bool isFull();

Implementation
Continued
cppfile(Stack.cpp)
 Stack::Stack(int s){
maxSize = s;
top = -1;
stack = new int[size];
}
 Stack::~Stack(){
delete[] stack;
}

Implementation
Continued
cppfile(Stack.cpp)
 void Stack::push(int value){
if(!isFull()){
stack[++top] = value;
}else{
cout<<“Stack is full!”<<endl;
}
}
 Int Stack::pop(){
if(!isEmpty()){
return stack[top--];
}else{
cout<<“Stack is Empty!”<<endl;
return -1;
}
}

Implementation
Continued
cppfile(Stack.cpp)
 int Stack::peek(){
if(!isEmpty()){
return stack[top];
}else{
cout<<“Stack is Empty!”<<endl;
return -1;
}
}
 int Stack::getSize(){
return maxSize;
}

Implementation
Continued
cppfile(Stack.cpp)
 b00l Stack::isEmptly(){
return top == -1;
}
 bool Stack::isFull(){
return top == maxSize - 1;
}

Implementation
Continued
mainfile(DataStructure.cpp)
Stack *numStack = new Stack(4);
numStack.push(2);
numStack.push(5);
numStack.push(6);
numStack.push(9);
numStack.peek();
numStack.pop();
numStack.peek();

Outro to
Stack • You can use Stack in any programming language.
• You can check out my Stack Implementation in java video
tutorial.
• Also Stack other videos(Stack using in projects, char data
type stack and etc.)
• And next video is Queue Data Structure.

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Stack Data structure

1. Stack Data Structure Youtube: SL Coder

2. Intro to Stack  ADT(Abstract Data Structure).  Based on array.  Logically stack is linear structure.  Data stores in top of the previous one.

3. Pros andCons Advantages(Pros) are  Insertion and deletion very quick.  Provides LIFO(Last In First Out). Disadvantages are  We can not access every item in stack.  Fixed size.  Memory consuming.

4. WhereStack are used?  Use to Implementing recursion  Return addresses are placed on a stack.  For reversing string.  Text Editors Undo/Redo feature.  Web browser recent visited.

5. Complexity  Push(insert) and pop(remove) takes constant O(1) time.  Search takes O(n).

6. Operations of Stack  push()  pop()  peek()  getSize()  isEmpty()  isFull()

7. Implementation headerfile(Stack.h) UsingVisual C++  Project name is DataStructure.  Add a class called Stack.  In header file(Stack.h) private: int maxSize; int top; int *stack;

8. Implementation Continued header file(Stack.h)  public: Stack(int s); ~Stack(); void push(int value); int pop(); int peek(); int getSize(); bool isEmpty(); bool isFull();

9. Implementation Continued cppfile(Stack.cpp)  Stack::Stack(int s){ maxSize = s; top = -1; stack = new int[size]; }  Stack::~Stack(){ delete[] stack; }

10. Implementation Continued cppfile(Stack.cpp)  void Stack::push(int value){ if(!isFull()){ stack[++top] = value; }else{ cout<<“Stack is full!”<<endl; } }  Int Stack::pop(){ if(!isEmpty()){ return stack[top--]; }else{ cout<<“Stack is Empty!”<<endl; return -1; } }

11. Implementation Continued cppfile(Stack.cpp)  int Stack::peek(){ if(!isEmpty()){ return stack[top]; }else{ cout<<“Stack is Empty!”<<endl; return -1; } }  int Stack::getSize(){ return maxSize; }

12. Implementation Continued cppfile(Stack.cpp)  b00l Stack::isEmptly(){ return top == -1; }  bool Stack::isFull(){ return top == maxSize - 1; }

13. Implementation Continued mainfile(DataStructure.cpp) Stack *numStack = new Stack(4); numStack.push(2); numStack.push(5); numStack.push(6); numStack.push(9); numStack.peek(); numStack.pop(); numStack.peek();

14. Outro to Stack • You can use Stack in any programming language. • You can check out my Stack Implementation in java video tutorial. • Also Stack other videos(Stack using in projects, char data type stack and etc.) • And next video is Queue Data Structure.

15. Thanks for Watching

Stack Data structure

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