Stack as ex3.1

Stack/Stack.cc

@@ -1,57 +1,26 @@
+//Stack.cc
 #include <iostream>
-using namespace std ;
+#include "Stack.hh"
 
-const int LEN = 80 ; // default stack length
-
-struct Stack {
-  // Implementation
-  double s[LEN] ;
-  int count ;
-
-  // Interface
-  void init() { count = 0 ; }
-  int nitems() { return count ; }
-  bool full() { return (count==LEN) ; }
-  bool empty() { return (count==0) ; }
-
-  void push(double c) { 
-    if (full()) {
-      cout << "Stack::push() Error: stack is full" << endl ;
-      return ;
-    }
-    s[count++] = c ;
-  }
-  
-  double pop() { 
-    if (empty()) {
-      cout << "Stack::pop() Error: stack is empty" << endl ;
-      return 0 ;
-    }    
-    return s[--count] ;
-  }
-} ;
-
-
-int main() {
-  
-  Stack s ;
-  s.init() ; // initialize Stack
-  
-  // Write doubles into Stack
-  int i ;
-  for (i=0 ; i<10 ; i++) {
-    cout << "pushing value " << i*i << " in stack" << endl ;
-    s.push(i*i) ;
-  }
-  
-  // Count doubles in fifo
-  cout << s.nitems() << " value in stack" << endl ;
-  
-  // Read doubles back from fifo
-  while (!s.empty()) {
-    double val = s.pop() ;
-    cout << "popping value " << val << " from stack" << endl ;
-  }
-
-  return 0 ;
+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;
+	}
 }

Stack/Stack.hh

@@ -0,0 +1,27 @@
+//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