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public char Pop() { if(tos==0) { ConsoleWriteLine(" -- Stack is empty"); return (char) 0; } tos--; return stck[tos]; } // Return true if the stack is full public bool IsFull() { return tos==stckLength; } // Return true if the stack is empty public bool IsEmpty() { return tos==0; } // Return total capacity of the stack public int Capacity() { return stckLength; } // Return number of objects currently on the stack public int GetNum() { return tos; } }

Let s examine this class closely The Stack class begins by declaring these two instance variables:

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// These members are private char[] stck; // holds the stack int tos; // index of the top of the stack

The stck array provides the underlying storage for the stack, which in this case holds characters Notice that no array is allocated The allocation of the actual array is handled by the Stack constructor The tos member holds the index of the top of the stack Both the tos and stck members are private This enforces the last-in, first-out stack mechanism If public access to stck were allowed, then the elements on the stack could be accessed out of order Also, since tos holds the index of the top element in the stack, manipulations of tos by code outside the Stack class must be prevented in order to avoid corruption of the stack Access to stck and tos is available, indirectly, to the user of Stack through the various public methods described shortly The stack constructor is shown next:

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// Construct an empty Stack given its size public Stack(int size) { stck = new char[size]; // allocate memory for stack tos = 0; }

Part I:

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The constructor is passed the desired size of the stack It allocates the underlying array and sets tos to zero Thus, a zero value in tos indicates that the stack is empty The public Push( ) method puts an element onto the stack It is shown here:

// Push characters onto the stack public void Push(char ch) { if(tos==stckLength) { ConsoleWriteLine(" -- Stack is full"); return; } stck[tos] = ch; tos++; }

The element to be pushed onto the stack is passed in ch Before the element is added to the stack, a check is made to ensure that there is still room in the underlying array This is done by making sure that tos does not exceed the length of stck If there is still room, the element is stored in stck at the index specified by tos, and then tos is incremented Thus, tos always contains the index of the next free element in stck To remove an element from the stack, call the public method Pop( ) It is shown here:

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// Pop a character from the stack public char Pop() { if(tos==0) { ConsoleWriteLine(" -- Stack is empty"); return (char) 0; } tos--; return stck[tos]; }