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Program to interchange the Small and Capital Letters and Unload the TSR on '@' Key Press from Keyboard

Posted By: Easy Tutor     Category: C Programming     Views: 2539

Write a Program to interchange the Small and Capital Letters and Unload the TSR on '@' Key Press from Keyboard.

Code for Program to interchange the Small and Capital Letters and Unload the TSR on '@' Key Press from Keyboard in C Programming

 # include <dos.h>


 void interrupt (*OldPrinterInterruptFunction)( );
 void interrupt NewPrinterInterruptFunction( );

 void interrupt (*OldKeyboardInterruptFunction)( );
 void interrupt NewKeyboardInterruptFunction( );


 int main( )
 {
    OldPrinterInterruptFunction=getvect(0x17);
    setvect(0x17,NewPrinterInterruptFunction);

    OldKeyboardInterruptFunction=getvect(0x09);
    setvect(0x09,NewKeyboardInterruptFunction);

    keep(0,(_SS+(_SP/16)-_psp));

    getch();
    return 0;
 }

 /*************************************************************************//*************************************************************************///------------------------  Funcion Definitions  ------------------------///*************************************************************************//*************************************************************************//*************************************************************************///------------------  NewPrinterInterruptFunction( )  -------------------///*************************************************************************/void interrupt NewPrinterInterruptFunction( )
 {
    if(_AH==0x00)
    {
       if(_AL>='a' && _AL<='z')
      _AL-=32;

       elseif(_AL>='A' && _AL<='Z')
      _AL+=32;
    }

    (*OldPrinterInterruptFunction)( );
 }

 /*************************************************************************///------------------  NewKeyboardInterruptFunction( )  ------------------///*************************************************************************/void interrupt NewKeyboardInterruptFunction( )
 {
    if(inport(0x60)=='@')
    {
       setvect(0x09,OldKeyboardInterruptFunction);
       setvect(0x17,OldPrinterInterruptFunction);

       freemem(_psp);
    }

    (*OldKeyboardInterruptFunction)( );
 }
  
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Easy Tutor
Easy Tutor author of Program to interchange the Small and Capital Letters and Unload the TSR on '@' Key Press from Keyboard is from United States. Easy Tutor says

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