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Stack as ADO

Interface (a file named Stack.h) 

// Stack ADO header file

void StackInit();      // set up empty stack
int  StackIsEmpty();   // check whether stack is empty
void StackPush(char);  // insert char on top of stack
char StackPop();       // remove char from top of stack

Note:

  • no explicit reference to Stack object
  • this makes it an Abstract Data Object (ADO)