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CSEG segment
org 100h
 
start:
	mov ax, 3D02h
	mov dx, offset just_file
	int 21h
	jc err
ok:
	mov dx, offset msg_ok
	mov ah, 9h
	int 21h
	int 20h
err:
	mov dx, offset msg_err
	mov ah, 9h
	int 21h
	int 20h
 
file_name db 'command.com', 0
just_file db 'file', 0
msg_ok    db 'file opened$'
msg_err   db 'error$'
 
CSEG ends
end start

prog.cpp:20:14: warning: character constant too long for its type
 file_name db 'command.com', 0
              ^
prog.cpp:21:14: warning: multi-character character constant [-Wmultichar]
 just_file db 'file', 0
              ^
prog.cpp:22:14: warning: character constant too long for its type
 msg_ok    db 'file opened$'
              ^
prog.cpp:23:14: warning: character constant too long for its type
 msg_err   db 'error$'
              ^
prog.cpp:1:1: error: 'CSEG' does not name a type
 CSEG segment
 ^

Standard output is empty