The C# Language in Visual C#

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The C# Language
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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:
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// Push characters onto the stack public void Push(char ch) { if(tos==stckLength) { ConsoleWriteLine(" -- Stack is full"); return; } stck[tos] = ch; tos++; }
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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]; }
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Here, the value of tos is checked If it is zero, the stack is empty Otherwise, tos is decremented, and the element at that index is returned Although Push( ) and Pop( ) are the only methods needed to implement a stack, some others are quite useful, and the Stack class defines four more These are IsFull( ), IsEmpty( ), Capacity( ), and GetNum( ), and they provide information about the state of the stack They are shown here:
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// 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
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A Closer Look at Methods and Classes
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public int Capacity() { return stckLength; }
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PART I PART I PART I
// Return number of objects currently on the stack public int GetNum() { return tos; }
The IsFull( ) method returns true when the stack is full and false otherwise The IsEmpty( ) method returns true when the stack is empty and false otherwise To obtain the total capacity of the stack (that is, the total number of elements it can hold), call Capacity( ) To obtain the number of elements currently stored on the stack, call GetNum( ) These methods are useful because the information they provide requires access to tos, which is private They are also examples of how public methods can provide safe access to private members The following program demonstrates the stack:
// Demonstrate the Stack class using System; class StackDemo { static void Main() Stack stk1 = new Stack stk2 = new Stack stk3 = new char ch; int i;
{ Stack(10); Stack(10); Stack(10);
// Put some characters into stk1 ConsoleWriteLine("Push A through J onto stk1"); for(i=0; !stk1IsFull(); i++) stk1Push((char) ('A' + i)); if(stk1IsFull()) ConsoleWriteLine("stk1 is full"); // Display the contents of stk1 ConsoleWrite("Contents of stk1: "); while( !stk1IsEmpty() ) { ch = stk1Pop(); ConsoleWrite(ch); } ConsoleWriteLine(); if(stk1IsEmpty()) ConsoleWriteLine("stk1 is empty\n"); // Put more characters into stk1 ConsoleWriteLine("Again push A through J onto stk1"); for(i=0; !stk1IsFull(); i++) stk1Push((char) ('A' + i)); // Now, pop from stk1 and push the element in stk2
Part I:
The C# Language
// This causes stk2 to hold the elements in reverse order ConsoleWriteLine("Now, pop chars from stk1 and push " + "them onto stk2"); while( !stk1IsEmpty() ) { ch = stk1Pop(); stk2Push(ch); } ConsoleWrite("Contents of stk2: "); while( !stk2IsEmpty() ) { ch = stk2Pop(); ConsoleWrite(ch); } ConsoleWriteLine("\n"); // Put 5 characters into stack ConsoleWriteLine("Put 5 characters on stk3"); for(i=0; i < 5; i++) stk3Push((char) ('A' + i)); ConsoleWriteLine("Capacity of stk3: " + stk3Capacity()); ConsoleWriteLine("Number of objects in stk3: " + stk3GetNum()); } }
The output from the program is shown here:
Push A through J onto stk1 stk1 is full Contents of stk1: JIHGFEDCBA stk1 is empty Again push A through J onto stk1 Now, pop chars from stk1 and push them onto stk2 Contents of stk2: ABCDEFGHIJ Put 5 characters on stk3 Capacity of stk3: 10 Number of objects in stk3: 5
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