Assembly: DUP command (MASM/TASM)
Contributed by William_Wilson 
Tagged: Computer programming how to use the DUP – duplicate command, nested or un-nested
As it sounds, DUP duplicates text.
Straight Example:
text DB 10 DUP (’W’) ;initializes 20 bytes to W
the number after DB defines how many bytes to repeat for, and then the ‘W’ defines what to repeat.
Nested:
barCode DB 4 DUP(3 DUP (’l’),2 DUP (’|’),5 DUP (’I’))
reserves 40 bytes in total, initialized to: lll||IIIIIlll||IIIIIlll||IIIIIlll||IIIII
each pass through creates lll||IIIII then this is repeated 4 times as it is nested within another DUP command.
Questions/Comments: william_a_wilson@hotmail.com
-William. § (marvin_gohan)
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ghoxt47 said on March 4, 2009
very odd
Dl said on June 16, 2009
Why my program(for Dos) work with sf db 80 dup 80(?) and doesn’t work with db 80 dup 80(1) ?
Yami_san said on November 22, 2010
cuz you need more space to store length?
braix said on October 2, 2011
can you make a program of sipher code
using assembly language
output:
input letters:abcde
cipher text: pqrst
reverse form:edcba
quit:[y/q]
input will accept only small letters if it is capital the program should not accept the input, also numbers should not be accepted…
quit: press y to continue, then q to exit…..thats all
please..help me to make this..project :)