B.Tech. (I) - ICP-132 (2009)
				Assignment 7

Level 0
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1. Given a number n by the user, create a file data_n.txt with each line 
having i, i^2 and i^3. If the file data_n.txt already exists, the 
program should print error message and quit.
Eg
	Input:
		5
	Output: (file data_n.txt)
		1, 1, 1
		2, 4, 8
		3, 9, 27
		4, 16, 64
		5, 25, 125

2. Remove the commas from the data_n.txt. If the file data_n.txt does 
not exist, then the program should print the error message and quit.

3. Write a program that reads data_n.txt and appends it to a file 
data_an.txt. The program should create data_an.txt if it is not found 
and should print a message that the file has been created.


Level 1
-------

1. Manually remove the second line from data_n.txt. Write a program to 
print the missing lines in data_n.txt.

2. A user enters multiple integers in three lines. Print the number of 
integers in each line and print their value doubled. The numbers are 
white space separated.
Eg
	Input:
		5	3  2    2
		1
		23 2   1
	Output:
		4: 10 6 4 4
		1: 2
		3: 46 4 2

3. A user enters multiple reals in three lines. Print the number of 
reals in each line and print their value doubled to single decimal 
accuracy. The numbers are comma separated.
Eg
	Input:
		5.1,3.2,2.1,2.1
		1.0
		22.5,3.4,1.0
	Output:
		4: 10.2 6.4 4.2 4.2
		1: 2.0
		3: 45.0 6.8 2.0


Level 2
-------

A data base is a collection of records. A record is a collection of
fields. The following questions are based on two data bases, SwissProt and
Nasdaq. The files are available at:
	https://iws60.iiita.ac.in/icp/assg/sprot.txt
	https://iws60.iiita.ac.in/icp/assg/nasdaq.txt

SwissProt: The file is a data base of proteins. Records are stored
sequentially. Some fields might be missing in individuals records. Content
of the field is preceeded by a two letter code that identifies the name of the
field. A record begins with the field 'ID' and ends with '//'.
Eg.
	ID   104K_SHEAN              Reviewed;         893 AA.
	AC   Q4U9M9;
	DT   01-APR-1990, integrated into UniProtKB/Swiss-Prot.
	DT   01-APR-1990, sequence version 1.
	DT   24-JUL-2007, entry version 37.
	DE   104 kDa microneme/rhoptry antigen precursor (p104).
	GN   OrderedLocusNames=TP04_0437;
	OS   Theileria parva.
	SQ   SEQUENCE   893 AA;  101921 MW;  2F67CEB3B02E7AC1 CRC64;
	     MKFLVLLFNI LCLFPILGAD ELVMSPIPTT DVQPKVTFDI NSEVSSGPLY LNPVEMAGVK
	     YLQLQRQPGV QVHKVVEGDI VIWENEEMPL YTCAIVTQNE VPYMAYVELL EDPDLIFFLK
	     EGDQWAPIPE DQYLARLQQL RQQIHTESFF SLNLSFQHEN YKYEMVSSFQ HSIKMVVFTP
	     KNGHICKMVY DKNIRIFKAL YNEYVTSVIG FFRGLKLLLL NIFVIDDRGM IGNKYFQLLD
	     DKYAPISVQG YVATIPKLKD FAEPYHPIIL DISDIDYVNF YLGDATYHDP GFKIVPKTPQ
	     CITKVVDGNE VIYESSNPSV ECVYKVTYYD KKNESMLRLD LNHSPPSYTS YYAKREGVWV
	     TSTYIDLEEK IEELQDHRST ELDVMFMSDK DLNVVPLTNG NLEYFMVTPK PHRDIIIVFD
	     GSEVLWYYEG LENHLVCTWI YVTEGAPRLV HLRVKDRIPQ NTDIYMVKFG EYWVRISKTQ
	     YTQEIKKLIK KSKKKLPSIE EEDSDKHGGP PKGPEPPTGP GHSSSESKEH EDSKESKEPK
	     EHGSPKETKE GEVTKKPGPA KEHKPSKIPV YTKRPEFPKK SKSPKRPESP KSPKRPVSPQ
	     RPVSPKSPKR PESLDIPKSP KRPESPKSPK RPVSPQRPVS PRRPESPKSP KSPKSPKSPK
	     VPFDPKFKEK LYDSYLDKAA KTKETVTLPP VLPTDESFTH TPIGEPTAEQ PDDIEPIEES
	     VFIKETGILT EEVKTEDIHS ETGEPEEPKR PDSPTKHSPK PTGTHPSMPK KRRRSDGLAL
	     STTDLESEAG RILRDPTGKI VTMKRSKSFD DLTTVREKEH MGAEIRKIVV DDDGTEADDE
	     DTHPSKEKHL STVRRRRPRP KKSSKSSKPR KPDSAFVPSI IFIFLVSLIV GIL
	//
The above record contains the fields ID, AC, DT, DE, GN, OS and SQ. The field
SQ contains sequence of the protein and does not have leading 'SQ' for the
lines containing the actual sequence. The sequence of this protein
(ID=104K_SHEAN) and the record are terminated by '//'.

Nasdaq: Each line is a record and fields are seperated by commas. There are no
missing fields. The first line gives names of various indices. Each subsequent
line is the corresponding index on various days. The first field, for example,
is the 'Date'.

1. Print the IDs of all the proteins in sprot.txt

2. Print the scientific names of all the organisms whose proteins have
records. The output must be in sorted order.  (Hint: You need to process the 
field OS and discard the information on strains. Use shell command to get an
idea as in, "grep ^OS sprot.txt | sort | uniq".)

3. Find the date on which the difference between the N100 and Financial100 is
maximum.


Level 3
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1. Print the IDs of all the proteins and the number of distinct amino acids in
their sequences. (Each amino acid is represented by a single alphabet.)

2. Given the ID of the protein, print the number of times each amino acid
occurs in the sequence.

3. Find the Nasdaq index that continued to grow for the longest time at a
stretch.