confusion city

[Petr_Kropotkin]

I created a driver for a widget and it runs perfectly, but I traslate it to Qt it does not work.
Here is the driver program:

void rule(int digit,int x, int place[])
{
 
   int n,flag=0;
   if(x % 2>0)
     n=floor(x/2);
   else
    n=x/2;
 
   for(int i=0;i<n;++i)
   if (place[i]==place[n-i])
       flag++;
  if (flag==n)
   std::cout <<"  "<<digit<<" is a palindrome";
  else
     std::cout<<"  " <<digit<<" is not  a palindrome";
 
 
 
}
 
 
int pow(int a ,int b)
{
  int i=1,power=1;
   while(i<b)
  {
     power *=a;
     ++i;
 
 }
    return power;
 
 
}
 
 
int main()
{
 
      int rem[10],digit,n,x=1,place[10];
      std::cout << "\nEnter  another number  :";
      std::cin>>digit;
      n= sizeof digit;
      std::cout<<"\nn= "<< n;
      rem[0]= digit % pow(10,n);
      place[0]= (digit-rem[0])/pow(10,n);
        while( x<n)
        {
         rem[x]=rem[x-1] % pow(10,n-x);
         place[x]=(rem[x-1]-rem[x])/pow(10,n-x);
 
         x++;
     }
          rule(digit,x,place);
 
      system("Pause");
 
    }

void rule(int digit,int x, int place[])
{

   int n,flag=0;
   if(x % 2>0)
     n=floor(x/2);
   else
    n=x/2;

   for(int i=0;i<n;++i)
   if (place[i]==place[n-i])
       flag++;
  if (flag==n)
   std::cout <<"  "<<digit<<" is a palindrome";
  else
     std::cout<<"  " <<digit<<" is not  a palindrome";



}


int pow(int a ,int b)
{
  int i=1,power=1;
   while(i<b)
  {
     power *=a;
     ++i;

 }
    return power;


}


int main()
{

      int rem[10],digit,n,x=1,place[10];
      std::cout << "\nEnter  another number  :";
      std::cin>>digit;
      n= sizeof digit;
      std::cout<<"\nn= "<< n;
      rem[0]= digit % pow(10,n);
      place[0]= (digit-rem[0])/pow(10,n);
        while( x<n)
        {
         rem[x]=rem[x-1] % pow(10,n-x);
         place[x]=(rem[x-1]-rem[x])/pow(10,n-x);

         x++;
     }
          rule(digit,x,place);

      system("Pause");

    }

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When run it Qt any number typed in states it is not a palindrome, but in the driver it worls
Here is the Qt version

#include "ui_palindrome.h"
#include "palindrome.h"
#include <QString>
#include <QtGui>
#include <QLineEdit>
#include <QPushButton>
#include <QSize>
 
 
void rule(int x, int place[],QLineEdit *lineEdit)
{
    QString msg=lineEdit->text()+" is a palindrome";
    QString msg2=lineEdit->text()+" is not  a palindrome";
    QMessageBox msgbox;
    int n,flag=0;
 
   if(x % 2>0)
     n=floor(x/2);
   else
    n=x/2;
 
 
   for(int i=0;i<n;++i)
   if (place[i]==place[n-i])
       flag++;
  if (flag==n)
 
      msgbox.setText(msg);
    else
      msgbox.setText(msg2);
 
      msgbox.exec();
 
}
 
 
 
 
 
int pow(int a ,int b)
{
  int i=1,power=1;
 while(i<b)
  {
     power *=a;
     ++i;
 }
 return power;
 
 }
 
 
 
palindrome::palindrome(QWidget *parent) :
    QDialog(parent)
 
{
   setupUi(this);
connect(checkButton, SIGNAL(clicked(bool)), this, SLOT(palindrome_checker()));
}
 
 
palindrome::~palindrome()
{
    delete this;
}
 
 
 
void  palindrome::palindrome_checker()
{
    int remainder[10],place[10],digit,x=1,m=0;
 
    digit=lineEdit->text().toInt();
    m=lineEdit->text().size();
    remainder[0]= digit % pow(10,m);
    place[0]= (digit-remainder[0])/pow(10,m);
     m=lineEdit->text().size();
      while(x<m)
      {
       remainder[x]=remainder[x-1] % pow(10,m-x);
       place[x]=(remainder[x-1]-remainder[x])/pow(10,m-x);
      ++x;
     }
 
   rule(x, place,lineEdit );
 
}

#include "ui_palindrome.h"
#include "palindrome.h"
#include <QString>
#include <QtGui>
#include <QLineEdit>
#include <QPushButton>
#include <QSize>


void rule(int x, int place[],QLineEdit *lineEdit)
{
    QString msg=lineEdit->text()+" is a palindrome";
    QString msg2=lineEdit->text()+" is not  a palindrome";
    QMessageBox msgbox;
    int n,flag=0;

   if(x % 2>0)
     n=floor(x/2);
   else
    n=x/2;


   for(int i=0;i<n;++i)
   if (place[i]==place[n-i])
       flag++;
  if (flag==n)

      msgbox.setText(msg);
    else
      msgbox.setText(msg2);

      msgbox.exec();

}





int pow(int a ,int b)
{
  int i=1,power=1;
 while(i<b)
  {
     power *=a;
     ++i;
 }
 return power;

 }



palindrome::palindrome(QWidget *parent) :
    QDialog(parent)

{
   setupUi(this);
connect(checkButton, SIGNAL(clicked(bool)), this, SLOT(palindrome_checker()));
}


palindrome::~palindrome()
{
    delete this;
}



void  palindrome::palindrome_checker()
{
    int remainder[10],place[10],digit,x=1,m=0;

    digit=lineEdit->text().toInt();
    m=lineEdit->text().size();
    remainder[0]= digit % pow(10,m);
    place[0]= (digit-remainder[0])/pow(10,m);
     m=lineEdit->text().size();
      while(x<m)
      {
       remainder[x]=remainder[x-1] % pow(10,m-x);
       place[x]=(remainder[x-1]-remainder[x])/pow(10,m-x);
      ++x;
     }

   rule(x, place,lineEdit );

}

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I posted problems with this widge & I thought I was, as far interface goes it reacts when a number is put in.
I think the problem might be

m=lineEdit->text().size();

m=lineEdit->text().size();

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but according to the documentation size() returns the size() of lineEdit->text() as an int.
Help !

[franz]

The sizeof statement in your original program doesn't make sense. sizeof int is always 4 (depending on the system). I've tested your original program and it rules wrongly on 45654 and 4554. Revise your algorithm.

On a side note, you don't have to do

delete this;

delete this;

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in a destructor. It is already being deleted. Before you jump into using Qt you might really really no really want to learn a thing or two about C++ first.