//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(); }