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June 27th, 2007 admin

Java Program Help (loops)?

I’ve been working on this one for hours and I can’t seem the get the correct commands into the program. PLZ HELP? THANKS IN ADVANCE!

Program Description: Messenger RNA (mRNA) molecules can be composed of different arrangements of 4 bases:

1.Adenine
2.Uracil
3.Cytosine
4.Guanine

Write a program that will generate and print out all the combinations of 3 bases which are possible within mRNA..

SAMPLE OUTPUT: (that I did myself, but can’t get the program to)

AAAAAUAACAAG
AUGAUUAUCAUG
ACAACUACCACG
AGAAGUAGCAGG
UAAUAUUACUAG
UUAUUUUUCUUG
UCAUCUUCCUCG
UGAUGUUGCUGG
CAACAUCACCAG
CUACUUCUCCUG
CCACCUCCCCCG
CGAC GUCGCCGG
CAAGAUGACGAG
GUAGUUGUCGUG
GCAGCUGCCGCG
GGAGGUGGCGGG

I would use nested loops, such as like this:

String letters[4] = {“A”,”U”,”C”,”G”};

for ( String a : letters )
for ( String b : letters )
for ( String c : letters )
System.out.println(a+b+c);

(Note: that may not work, as I haven’t tested it, and I’ve been working with some other languages recently)