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Hello, I need help with this c++ program.
Arithmetic.cpp
#include <cstdlib>
#include <iostream>
#include "ArrayStack.h"
float eval(std::string);
// The following main function should not be modified
int main(void) {
std::string expression = "Continue";
do {
std::cout << "Enter an arithmetic expression on a single line ('q' to end): ";
getline(std::cin, expression);
if (expression[0] != 'q') {
float result = eval(expression);
std::cout << expression << " = " << result << std::endl;
}
} while (expression[0] != 'q');
return 0;
}
float eval(std::string expr)
{ // To be implemented
// Any number of support functions may also be added
std::cout << "eval function not implemented" << std::endl;
return 0;
}
ArrayStack.cpp
#include <cassert>
#include "ArrayStack.h"
#include "StackException.h"
template <class T>
ArrayStack<T>::ArrayStack() : top(-1) {
// top = -1;
}
//ArrayStack::ArrayStack(const ArrayStack& orig) {
//}
//
//ArrayStack::~ArrayStack() {
//}
template <class T>
bool ArrayStack<T>::isEmpty() const {
return (top < 0);
}
template <class T>
T ArrayStack<T>::peek() const {
//If isEmpty(), what do I return?
//use precondition, if it fails program halts
assert(!isEmpty());
return items[top];
}
template <class T>
bool ArrayStack<T>::pop() {
bool result = false;
// if (!isEmpty()) {
// top--;
// result = true;
// }
// return result;
if (!isEmpty())
top--;
else
throw StackException("Pop called on an empty stack");
return result;
}
template <class T>
bool ArrayStack<T>::push(const T& newItem) {
bool result = false;
if (top < SIZE -1) {
top++;
items[top] = newItem;
result = true;
} else {
throw StackException("Push called on a full stack");
}
return result;
}
ArrayStack.h
#ifndef ARRAYSTACK_H
#define ARRAYSTACK_H
#include "StackADT.h"
const int SIZE = 50;
template <class T>
class ArrayStack : StackADT<T> {
public:
ArrayStack();
// ArrayStack(const ArrayStack& orig);
// virtual ~ArrayStack();
//interface methods
bool isEmpty() const;
bool push(const T& newItem);
bool pop();
T peek() const;
private:
// static const int SIZE = 50;
T items[SIZE];
int top;
};
#include "ArrayStack.cpp"
#endif /* ARRAYSTACK_H */
Main.cpp
#include <cstdlib>
#include <iostream>
#include "ArrayStack.h"
#include "StackException.h"
#include <stdexcept>
using namespace std;
/*
*
*/
int main() {
ArrayStack<int> intStack;
cout << "Beginning " << boolalpha << intStack.isEmpty() << endl;
for (int i=1; i<=5; i++) {
// try {
intStack.push(i);
// } catch (StackException e) {
// cout << e.what() << endl;
// }
}
cout << "After push " << boolalpha << intStack.isEmpty() << endl;
//check copy constructor
ArrayStack<int> numStack(intStack);
cout << "Copied item: " << numStack.peek() << endl;
intStack.pop();
cout << "Copied item: " << intStack.peek() << endl;
cout << "Copied item: " << numStack.peek() << endl;
cout << "Contents: ";
int sum = 0;
while (!intStack.isEmpty()) {
cout << intStack.peek() << " ";
sum += intStack.peek();
try {
intStack.pop();
} catch (StackException e) {
cout << e.what() << endl;
}
}
cout << endl << "Sum: " << sum << endl;
ArrayStack<string> strStack;
strStack.pop();
cout << "Did a problem occur with pop? " << endl;
// intStack.peek();
// cout << "Did a problem occur with peek? " << endl;
return 0;
}
StackADT.h
#ifndef STACKADT_H
#define STACKADT_H
template <class T>
class StackADT {
public:
virtual bool isEmpty() const = 0;
virtual bool push(const T& newItem) = 0;
virtual bool pop() = 0;
virtual T peek() const = 0;
};
#endif /* STACKADT_H */
StackException.cpp
#include <string>
#include "StackException.h"
StackException::StackException(const std::string& msg) : logic_error (msg) {
}
StackException.h
#ifndef PUSHEXCEPTION_H
#define PUSHEXCEPTION_H
#include <stdexcept>
#include <string>
class StackException : public std::logic_error {
public:
StackException(const std::string& msg = "");
private:
};
#endif /* PUSHEXCEPTION_H */
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