IStack

All Known Implementing Classes:

Stack
```
public interface IStack
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`displayStack()`	Pretty prints the stack's elements, starting from the top-most element to the bottom.
`void`	`insertBottom(char elem)`	Inserts the specified element to the bottom of the stack.
`boolean`	`isEmpty()`	Checks if the stack is empty.
`boolean`	`isFull()`	Checks if the stack is full.
`int`	`length()`	Returns the length of the stack.
`void`	`makeNull()`	Clears the stack.
`void`	`pop()`	Removes the element at the top of the stack if the stack is not empty.
`void`	`push(char elem)`	Pushes a character element onto the top of the stack if there is space.
`char`	`top()`	Returns the element at the top of the stack, otherwise '\0' if the stack is empty.

- Method Detail
  - push
```
void push(char elem)
```
    Pushes a character element onto the top of the stack if there is space.
    
    Parameters:
    
    elem - The character element to push onto the stack.
  - pop
```
void pop()
```
    Removes the element at the top of the stack if the stack is not empty.
  - top
```
char top()
```
    Returns the element at the top of the stack, otherwise '\0' if the stack is empty.
    
    Returns:
    
    char
  - isEmpty
```
boolean isEmpty()
```
    Checks if the stack is empty.
    
    Returns:
    
    true if the stack is empty, false otherwise.
  - isFull
```
boolean isFull()
```
    Checks if the stack is full.
    
    Returns:
    
    true if the stack is full, false otherwise.
  - displayStack
```
void displayStack()
```
    Pretty prints the stack's elements, starting from the top-most element to the bottom.
  - length
```
int length()
```
    Returns the length of the stack.
    
    Returns:
    
    int
  - makeNull
```
void makeNull()
```
    Clears the stack.
    
    Parameters:
    
    s - a pointer to the Stack object (struct Stack *)
  - insertBottom
```
void insertBottom(char elem)
```
    Inserts the specified element to the bottom of the stack.
    
    Parameters:
    
    s - a pointer to the Stack object (struct Stack *)
    
    elem - the element to add to the stack