dev-cpp-users Mailing List for Dev-C++

hi, my stack works, (thanks to Mr. Hardman,) but i am now trying to create a 
calculator:  type in digits 0~9 in one line, like this: 123, for example. 
Then if you type in '+', then the prgm pushes the top two # out of stack, 
add them, and pop it back in. So 2 and 3 would be added and 5 is popped in 
on top of 1. same for '*' and '-'. if '=' is typed then the top element of 
the stack is displayed on the screen (like the answer).

i have to make sure that all the input chars be on one line but not 
overlapping, and that my add, subtract and mult. functions work (they 
don't.)

notes: 'q' quits the program and 'i' clears everything on the screen except 
the > prompt.

thank you for your help : )

#include <iostream.h>
#include <conio.h>
#include <stdlib.h>

int const max_stack = 100;

class stacktype
  {
    public:
  		 stacktype();
         	//	default constructor
         	//	postcondition:	initializes stack by setting TOP = 0
         void initialize();
         	//	postcondition:	erase stack by setting TOP = 0
         void push( int );
         	//	postcondition:	If the stack is not full,
            //							increase TOP by 1 , then
            //							put info into DATA[TOP]
         int pop();
         	//	postcondition:	If the stack is not empty,
           	//                 	put DATA[TOP] into x,
            //							decrease TOP by 1,
            //							return x
        	bool is_empty();
         	//	postcondition:	Return true if stack is empty, false otherwise.
         bool is_full();
         	//	postcondition:	Return true if stack is full, false otherwise.
    private:
    		int mydata[max_stack];
         int mytop;			//	subscript of the top of the stack
  };


//==============================================================================
//============================== Free functions 
================================
//==============================================================================

void a_two( stacktype );
   // precondition:  send in stack
   // postcondition: new stack formed with top element = sum of top 2 
elements
   //                of old stack

void s_two( stacktype );
   // precondition:  send in stack
   // postcondition: new stack formed with top element = difference of top 2
   //                elements of old stack

void m_two( stacktype );
   // precondition:
   // postcondition:

void display_top( stacktype );
	//	precondition:	send in stack
   //	postcondition:	display, without destruction, the value in data[top]

//==============================================================================
//============================== Implementation 
================================
//==============================================================================

stacktype::stacktype()
{
   mytop = 0;
}
void stacktype::initialize()
{
   mytop = 0;
   clrscr();
   gotoxy(3,3);
   cout<< "> ";
}
bool stacktype::is_empty()
{
   return (mytop == 0);
}
bool stacktype::is_full()
{
   return (mytop == max_stack-1);
}
void stacktype::push( int x )
{
	if( !is_full() )
   {
      mytop++;
      mydata[mytop] = x;
   }
}
int stacktype::pop()
{
   if( !is_empty() )
   {
      int x = mydata[mytop];
      mytop--;
      return x;
   }
}


//==============================================================================
//============================== Client Program 
================================
//==============================================================================

int main()
{
   int c = 3;
   stacktype S;
   char z;
   gotoxy(3,3);
   cout<< "> ";
   c = 5;
   while( z != 'Q' && z != 'q' )
   {
      gotoxy(c,3);
      cin>> z;
      switch( z )
      {
         case 'I':
         case 'i':  S.initialize();
                    break;

         case '+':  a_two(S);

                    break;

         case '-':  s_two(S);

                    break;

         case '*':  m_two(S);

                    break;

         case '=':  display_top(S);

                    break;

         case '0':
         case '1':
         case '2':
         case '3':
         case '4':
         case '5':
         case '6':
         case '7':
         case '8':
         case '9':  z = getche();
                    int j = z;
                    S.push( j );
                    break;

      }
      c++;
      z = getche();
   }
}

void a_two( stacktype S )
{
   int p = S.pop();
   int q = S.pop();
   S.push( p+q );
}

void s_two( stacktype S )
{
   int p = S.pop();
   int q = S.pop();
   S.push( p-q );
}

void m_two( stacktype S )
{
   int p = S.pop();
   int q = S.pop();
   S.push( p*q );
}

void display_top( stacktype S )
{
   int t = S.pop();
   cout<< t;
   S.push(t);
}








_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp

The Old Wolf schrieb:
> I've looked around the email and forum sites and couldn't 
> find an answer to either of the following. (If I've missed it, 
> just point me in the right direction, please!)
> 1 has anyone been able to get the free Windows version 
> of Qt to link? If so, is there a doc I can get ahold of 
> explaining it?

Sorry, but the Trolltechs say at their website:

---
The Qt Non Commercial Edition for Microsoft Windows is a binary only
distribution requiring Microsoft Visual Studio version 6.

We have no plans to support other compilers, but we may do so in the
future. The Professional and Enterprise Editions include full source
code and support several compilers.
---

(To be found at
http://www.trolltech.com/developer/download/qt-win-noncomm.html )

- Guido

With strcpy() defined in <cstring>, and <string.h>. But better use the
string type defined in <string>. For example:


#include  <iostream>
#include <string>

int main()
{
 using namespace std;
 
 
 string a="This is";
 string b=" a string\n";
 string c;
 

 c=a+b; // c=="This is a string\n"
 a+=b; // a=="This is a string\n"
 
 
 cout<<a<<c;
 
}


Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
* Alternative URL: http://run.to/noicys


> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of Exuss Draugas
> Sent: Friday, December 07, 2001 7:58 PM
> To: Dev...@li...
> Subject: [Dev-C++] Array of char
> 
> 
> 
> 
>  Hi All!
> 
>  Just a simple question. How to assing a value to array of char?
>  
>  char myValue[20] = "Some text!";
>  cout << myValue << endl;
> 
>  // This is don't work :((
>  myValue="New text";
>  
>  Works only: cin >> myValue;
> 
>   Thanks,
> 
>   Exuss
> 
> 
> 
> 
> 
> 
> --
> Nemokama el.pasto dezute - http://webmail.delfi.lt/
> 
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
> 

I've looked around the email and forum sites and couldn't find an answer to either of the following. (If I've missed it, just point me in the right direction, please!)
1 has anyone been able to get the free Windows version of Qt to link? If so, is there a doc I can get ahold of explaining it?
2 The getopt function does not seem to be in the unistd.h headers (or anywhere else in the basic include directories) is there one? Or even a quick clone I can 
swipe?

														Thanks for your time!
															Dan