//push()
Error_code Stack::push(const Stack_entry &item){
Error_code outcome=success;
if(count>=stackmax)
outcome=overflow;
else
entry[count++]=item;
return outcome;
}
//top()
Error_code Stack::top(Stack_entry &item){
Error_code outcome=success;
if(count==0)
outcome=underflow;
else
item=entry[count-1];
return outcome;
}
//clear()
Error_code Stack::clear(){
count=0;
return success;
}
//empty()
bool Stack::empty() const{
bool outcome=true;
if(count!=0)
outcome=false;
return outcome;
}
#include"stack.h"
//implemention
//Stack()
Stack::Stack(){
count=0;
}
//pop()
Error_code Stack::pop(){
Error_code outcome=success;
if(count==0)
outcome=underflow;
else
count--;
return outcome;
}
//push()
Error_code Stack::push(const Stack_entry &item){
Error_code outcome=success;
if(count>=stackmax)
outcome=overflow;
else
entry[count++]=item;
return outcome;
}
//top()
Error_code Stack::top(Stack_entry &item){
Error_code outcome=success;
if(count==0)
outcome=underflow;
else
item=entry[count-1];
return outcome;
}
//clear()
Error_code Stack::clear(){
count=0;
return success;
}
//empty()
bool Stack::empty() const{
bool outcome=true;
if(count!=0)
outcome=false;
return outcome;
}
caculator.h
[cpp] view plaincopyprint
#ifndef CALCULATOR_H
#define CALCULATOR_H
#include"stack.h"
class Calculator{
public:
//constructor
Calculator();
//public function to get command
void get_command();
//pubblic funtion to do the command
bool do_command();
protected:
//As these functions will not be visible to the client
//but should be derived classes to access so I declare it as protected functions
void PutInNum();
void Add();
void Sub();
void Mul();
void Div();
void ShowResult();
void Clear();
void Quit();
private:
//data members
char command;
Stack numbers;
};
#endif
#ifndef CALCULATOR_H
#define CALCULATOR_H
#include"stack.h"
class Calculator{
public:
//constructor
Calculator();
//public function to get command
void get_command();
//pubblic funtion to do the command
bool do_command();
protected:
//As these functions will not be visible to the client
//but should be derived classes to access so I declare it as protected functions
void PutInNum();
void Add();
void Sub();
void Mul();
void Div();
void ShowResult();
void Clear();
void Quit();
private:
//data members
char command;
Stack numbers;
};
#endif
caculator.cpp
[cpp] view plaincopyprint
#include "calculator.h"
#include
using namespace std;
//construction
Calculator::Calculator(){
command=' ';
}
//get_command
void Calculator::get_command(){
bool waiting =true;
cout<<"Select command and press :";
while(waiting){
cin>>command;
command=tolower(command);
if(command==' '||command=='='||command=='+'||
command=='-'||command=='*'||command=='/'||
command=='q'||command=='c')
waiting=false;
else
cout<<"Please enter a valid command:"< <<"[ ]push to stack [=]print top "< <<"[+][-][*][/] are arithmetic operations"< <<"[c]clean the stack"< <<"[Q] quit"< }
}
//do_command
bool Calculator::do_command(){
get_command();
switch(command){
case ' ':
PutInNum();
break;
case '+':
Add();
break;
case '-':
Sub();
break;
case '*':
Mul();
break;
case '/':
Div();
break;
case 'c':
Clear();
break;
case '=':
ShowResult();
break;
case 'q':
return false;
}
return true;
}
//Once enter ' ': put the next number into stack
void Calculator::PutInNum(){
Stack_entry p;
cout<<"Enter a real number: "< cin>>p;
if(numbers.push(p)==overflow)
cout<<"Warning:Stack full,lost number"< }
//Once enter '+' : Add the numbers in the stack
void Calculator::Add(){
Stack_entry p,q;
if(numbers.top(p)==underflow)
cout<<"Stack empty"< else{
numbers.top(p);
numbers.pop();
if(numbers.top(q)==underflow){
cout<<"Stack has just one entry"< numbers.push(p);
}
else{
numbers.pop();
if(numbers.push(p+q)==overflow)
cout<<"Warning:Stack full,lost result"< }
}
}
//Once enter '-': Subtract the numbers in the stack
void Calculator::Sub(){
Stack_entry p,q;
if(numbers.top(p)==underflow)
cout<<"Stack empty"< else{
numbers.top(p);
numbers.pop();
if(numbers.top(q)==underflow){
cout<<"Stack has just one entry"< numbers.push(p);
}
else{
numbers.pop();
if(numbers.push(q-p)==overflow)
cout<<"Warning:Stack full,lost result"< }
}
}
//Once enter'*': Multiply the numbers in the stack
void Calculator::Mul(){
Stack_entry p,q;
if(numbers.top(p)==underflow)
cout<<"Stack empty"< else{
numbers.top(p);
numbers.pop();
if(numbers.top(q)==underflow){
cout<<"Stack has just one entry"< numbers.push(p);
}
else{
numbers.pop();
if(numbers.push(p*q)==overflow)
cout<<"Warning:Stack full,lost result"< }
}
}
//Once enter '/': Divide the numbers in the stack
void Calculator::Div(){
Stack_entry p,q;
if(numbers.top(p)==underflow)
cout<<"Stack empty"< else{
numbers.top(p);
numbers.pop();
if(p==0){
cout<<"Bed command! The second number is 0 and cannot finishi divide command!"< }
else if(numbers.top(q)==underflow){
cout<<"Stack has just one entry"< numbers.push(p);
}
else{
numbers.pop();
if(numbers.push(q/p)==overflow)
cout<<"Warning:Stack full,lost result"< }
}
}
//Once enter '=':Show the result of least command
void Calculator::ShowResult(){
Stack_entry p;
if(numbers.top(p)==underflow)
cout<<"Stack empty"< else
cout< }
//Once enter 'q':Stop the calculation
void Calculator::Quit(){
cout<<"Calculation finished!"< }
//Once enter 'c':Clear the stack
void Calculator::Clear(){
numbers.clear();
}
#include "calculator.h"
#include
using namespace std;
//construction
Calculator::Calculator(){
command=' ';
}
//get_command
void Calculator::get_command(){
bool waiting =true;
cout<<"Select command and press :";
while(waiting){
cin>>command;
command=tolower(command);
if(command==' '||command=='='||command=='+'||
command=='-'||command=='*'||command=='/'||
command=='q'||command=='c')
waiting=false;
else
cout<<"Please enter a valid command:"< <<"[ ]push to stack [=]print top "< <<"[+][-][*][/] are arithmetic operations"< <<"[c]clean the stack"< <<"[Q] quit"< }
}
//do_command
bool Calculator::do_command(){
get_command();
switch(command){
case ' ':
PutInNum();
break;
case '+':
Add();
break;
case '-':
Sub();
break;
case '*':
Mul();
break;
case '/':
Div();
break;
case 'c':
Clear();
break;
case '=':
ShowResult();
break;
case 'q':
return false;
}
return true;
}
//Once enter ' ': put the next number into stack
void Calculator::PutInNum(){
Stack_entry p;
cout<<"Enter a real number: "< cin>>p;
if(numbers.push(p)==overflow)
cout<<"Warning:Stack full,lost number"< }
//Once enter '+' : Add the numbers in the stack
void Calculator::Add(){
Stack_entry p,q;
if(numbers.top(p)==underflow)
cout<<"Stack empty"< else{
numbers.top(p);
numbers.pop();
if(numbers.top(q)==underflow){
cout<<"Stack has just one entry"< numbers.push(p);
}
else{
numbers.pop();
if(numbers.push(p+q)==overflow)
cout<<"Warning:Stack full,lost result"< }
}
}
//Once enter '-': Subtract the numbers in the stack
void Calculator::Sub(){
Stack_entry p,q;
if(numbers.top(p)==underflow)
cout<<"Stack empty"< else{
numbers.top(p);
numbers.pop();
if(numbers.top(q)==underflow){
cout<<"Stack has just one entry"< numbers.push(p);
}
else{
numbers.pop();
if(numbers.push(q-p)==overflow)
cout<<"Warning:Stack full,lost result"< }
}
}
//Once enter'*': Multiply the numbers in the stack
void Calculator::Mul(){
Stack_entry p,q;
if(numbers.top(p)==underflow)
cout<<"Stack empty"< else{
numbers.top(p);
numbers.pop();
if(numbers.top(q)==underflow){
cout<<"Stack has just one entry"< numbers.push(p);
}
else{
numbers.pop();
if(numbers.push(p*q)==overflow)
cout<<"Warning:Stack full,lost result"< }
}
}
//Once enter '/': Divide the numbers in the stack
void Calculator::Div(){
Stack_entry p,q;
if(numbers.top(p)==underflow)
cout<<"Stack empty"< else{
numbers.top(p);
numbers.pop();
if(p==0){
cout<<"Bed command! The second number is 0 and cannot finishi divide command!"< }
else if(numbers.top(q)==underflow){
cout<<"Stack has just one entry"< numbers.push(p);
}
else{
numbers.pop();
if(numbers.push(q/p)==overflow)
cout<<"Warning:Stack full,lost result"< }
}
}
//Once enter '=':Show the result of least command
void Calculator::ShowResult(){
Stack_entry p;
if(numbers.top(p)==underflow)
cout<<"Stack empty"< else
cout< }
//Once enter 'q':Stop the calculation
void Calculator::Quit(){
cout<<"Calculation finished!"< }
//Once enter 'c':Clear the stack
void Calculator::Clear(){
numbers.clear();
}