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String Programs

Copy string Substring of string String concatination Vowel in string Swap char in string Palindrome string Rotate string Bubble sort of strings Sorting of words Encode decode string Compress string

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biosequip( ) - sys confi biosdisk( ) - partition tbl info Pc type-bios data area File allocation table Telephone directory

TSR Programming

Interchange letters Interchange letters on screen Unload TSR on key press-keyboard Unload TSR - timer interrupt Activate, deactivate TSR Print alphabet from printer Repeat key press Keep caps on Make ctrl, alt key pressed

Interrupt Programming

Restart computer Conventional memory of sys Save IVT in file Print string-interrupt 21h Read char-interrupt 21h Read char with echo-interrupt 21h Delete file-interrupt 21h Delete directory-interrupt 21h Get set system date Show system configuration Search, delete file in dir Display multiple file in dir

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Program to make Ctrl and Alt Key Pressed on a Key Press from Keyboard

 
 # include <dos.h>


 char far* CtrlAltPtr=(char far*)0x417;


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


 int main( )
 {
    OldKeyboardInterruptFunction=getvect(0x09);
    setvect(0x09,NewKeyboardInterruptFunction);

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

    return 0;
 }



 //------------------  NewKeyboardInterruptFunction( )  ------------------//


 void interrupt NewKeyboardInterruptFunction( )
 {
    *CtrlAltPtr=0x0C;

    (*OldKeyboardInterruptFunction)( );
 }
[/Code]

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