Text box and list box connectivity

[Rekha]

hi,
i'm beginner to Qt.. there is a text box and list box,when u enter some characters in the text box and give enter to a push button,it should add all the characters to listbox.. so i had written code 4 tat,everything works fine,but adding characters to listbox is not wrkg fine.. the code for adding characters is given below,
pls check wats wrong with code

void show()
   { 
      QTextLength str1;
      QTextStream str,str2;
      str=text1.text();
      str1=length(str);  
 
      for(int i=0;i<str1;i++)
       {
 
           str2=insertText(list1.at(i));
             i++; 
       }
       display->setText(display->text()+str2);      
    }

void show()
   { 
      QTextLength str1;
      QTextStream str,str2;
      str=text1.text();
      str1=length(str);  
      
      for(int i=0;i<str1;i++)
       {
 
           str2=insertText(list1.at(i));
             i++; 
       }
       display->setText(display->text()+str2);      
    }

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