Ex3.1: Stack turned into a class

ex3/ex3.1/Stack.cc

@@ -0,0 +1,26 @@
+//Stack.cc
+#include <iostream>
+#include "Stack.hh"
+
+void Stack::push(double c) { 
+	if (full()) {
+		std::cout << "Stack::push() Error: stack is full" << std::endl ;
+		return ;
+	}
+	s[count++] = c ;
+}
+
+double Stack::pop() { 
+	if (empty()) {
+		std::cout << "Stack::pop() Error: stack is empty" << std::endl ;
+		return 0 ;
+	}		
+	return s[--count] ;
+}
+
+void Stack::inspect() {
+	for ( int i = nitems() - 1; i >= 0; i-- )
+	{
+		std::cout << i << ": " << s[i] << std::endl;
+	}
+}

ex3/ex3.1/Stack.hh

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+//Stack.h
+
+#ifndef STACK_H
+#define STACK_H
+
+const int LEN = 80 ; // default stack length
+class Stack {
+	// Interface
+	public:
+		Stack() { init(); }
+		~Stack() {}
+		int  nitems() { return count ; }
+		bool full() { return (count==LEN) ; }
+		bool empty() { return (count==0) ; }
+
+		void push( double c );
+		double pop();
+		void inspect();
+
+	// Implementation
+	private:
+		void init() { count = 0 ; }
+		double s[LEN] ;
+		int count ;
+	
+};
+#endif

ex3/ex3.1/main.cpp

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+#include <iostream>
+#include "Stack.hh"
+
+/*
+ * Using 100 elements is too much for the default stack
+ * But it fails gracefully so when popping it starts from 80
+ */
+using namespace std ;
+
+int main() {
+	Stack s ;// initialize Stack
+	
+	// Write doubles into Stack
+	int i ;
+	for (i=0 ; i<100 ; i++) {
+		cout << "pushing value " << i*i << " in stack" << endl ;
+		s.push(i*i) ;
+	}
+	
+	// Count doubles in fifo
+	cout << s.nitems() << " value in stack" << endl ;
+
+	cout << "Inspect the FIFO" << endl;
+	s.inspect();
+	
+	
+	// Read doubles back from fifo
+	while (!s.empty()) {
+		double val = s.pop() ;
+		cout << "popping value " << val << " from stack" << endl ;
+	}
+	
+	cout << "Inspect the FIFO" << endl;
+	s.inspect();
+	return 0 ;
+}