Homework assignments

Homework grades

Last updated: October 18, 2016

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Max points: HW01 - 50, HW02 - 40, HW03 - 55, HW04 - 50, HW05 - 75,
    ID     SC     HW01     HW02     HW03     HW04     HW05     %     GitLab
xxx4114 1.00 50 40 55 50 72 ok
xxx5519 1.00 45 40 55 45 69
xxx6265 1.00 50 40 55 40 75 96 ok
xxx3187 1.00 50 40 55 50 72 ok
xxx8729 1.10 47 40 35 ok
xxx6898 1.10 50 40 55 45 75 100 ok
xxx0898 1.00 50 40 55 54 ok
xxx4755 1.00 48 40 55 50 75 99 ok
xxx7629 1.00 45 40 55 50 70 ok
xxx1942 1.00 50 40 55 50 75 100 ok
xxx0692 1.00 50 40 55 40 53 88 ok
xxx2621 1.00 50 40 55 50 75 100 ok
xxx4647 1.00 50 40 55 54 ok
xxx6671 1.10 50 40 55 75 90 ok
xxx7975 1.00 50 40 55 20 75 89 ok
xxx4528 1.00 45 40 55 30 75 91 ok
xxx0272 1.00 50 40 55 40 53 88 ok
xxx5327 1.00 50 30 50 48 ok
xxx4461 1.00 50 40 55 55 35 87 ok
xxx7477 1.00 50 40 55 50 75 100 ok
xxx0694 1.10 50 40 55 59 ok

HW08

Last updated: November 8, 2016

Homework cancelled

HW07

Last updated: November 1, 2016

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Problems:

HW7, [ 52K ], last updated November 01, 2016

HW06

Last updated: October 17, 2016

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Reading:
Agustín Cernuda del Río, How Not to Go About a Programming Assignment

Reading:
CS50 programming style guide

Video:
N. Hardison, CS50, Libraries

Video:
N. Hardison, CS50, GDB

Video:
N. Hardison, CS50, Binary

Problems:

HW6, [ 61K ], last updated October 18, 2016

Code for Problem 4 HW6, [ 352 ], last updated October 16, 2016

HW05

Last updated: September 29, 2016

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Video:
R. Bowden, CS50, Pointers

Video:
R. Bowden, CS50, Structs

Video:
J. Jozwiak, CS50, Typecasting

Video:
N. Hardison, CS50, ASCII

Problems:

HW5, [ 73K ], last updated September 29, 2016

HW04

Last updated: September 22, 2016

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Video:
J. Jozwiak, CS50, Precedence

Video:
R. Bowden, CS50, Compilers

Video:
D. Dicuircio, CS50, Scope

Video:
J. McCormick, CS50, Local and global variables

Problems:

HW4, [ 58K ], last updated September 22, 2016

HW03

Last updated: September 15, 2016

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Video:
T. MacWilliam, CS50, Loops

Video:
R. Bowden, CS50, Arrays

Video:
J. Jozwiak, CS50, Typecasting

Video:
N. Hardison, CS50, Functions

Problems:

HW3, [ 64K ], last updated September 27, 2016

HW02

Last updated: September 7, 2016

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Reading:
Virtualization

Video:

J. Leek, Command line interface
Local copy of the video and the lecture notes posted online on September 01, 2014; on-campus access only

Video:

T. MacWilliam, CS50, C programming: Code Style

Video:

V. Shekhawat, CS50, Boolean Values

Video:

V. Shekhawat, CS50, Variables

Problems:

HW02, [ 58K ], last updated September 07, 2016

Programming:

The following fully functional 'chromosome-shaped' program is one of the winners of 2014 International Obfuscated C Code Contest . What does it do?

#include <stdio.h> #define TA q=/*XYXY*/ #define/*X YXY*/CG r= void p(int n,int c){; for(;n--;) putchar(c) #define Y( z)d;d=c++\ %2<1?x=x*4 +z,c%8>5?\ x=x?p(1,x), 0:x:0:0;d= #define/*X YX*/C Y(1) #define/*X YX*/G Y(2) ;}int(*f)( void),d,c, #define/*X YX*/A Y(0) #define/*XY*/AT int\ m(void/**/){d= #define/*XYX*/T Y(3) #define GC d; return\ 0;}int(*f) (void )=m; x,q,r; int main(){if( f)f();else {for(puts( "#include" "\40\"pro\ g.c\"\n\n \101T"+0); d=!d?x=(x= getchar()) <0?0:x,8*8 :d,TA++c%8 ,TA(1+7*q- q*q)/3,r=c *15-c*c-36 ,p(r<0?!q+ 4:r/6+!q+4 ,32),q||x; c%=16)q?p( 1,"ACGT"[x /d&3]),p(q ,126),p(1, "TGCA"[x/d &3]),d/=4, p(001,10): puts(c%8?\ "CG":"TA") ;puts("GC" );}return 0;}/**/

Hints

  • Copy and save the code of the program to a file, say prog.c
  • Compile the code as usual: 
    clang -Wall prog.c -o prog
  • Run the program as following: 
    echo 12345 | ./prog

HW01

Last updated: September 8, 2016

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Reading:

Mike Vanier, Scalable computer programming languages

Based on the information from the article, what language would you you choose for the first programming course?

Data analysis:

Popularity of computer programming languages

Look for the Long term trends graph and Very long term history table

Data analysis:

XYZ dominates supercomputers as never before

For the latest data visit TOP500 and chose Operating System Family as a category for the search

Problems:

HW01, [ 56K ], last updated August 29, 2016

Software:

Download and install: VirtualBox

Download and import: physics 2200 virtual appliance, ca 4GB, last updated Sep 1, 2016. 

MD5 Checksum:     58BFDDE92789CD324DBD980816A9ABD0
SHA-1 Checksum:   AD5CF6E7A5DC241B74490277D12F84F2FE21776A
SHA-256 Checksum: 5E130F959479A9E9EF857BDD21342AA3B039568C9D9706C48089540D019BAF47
SHA-512 Checksum: BA6960EB03162DF4ECE9FDDD3896874D552563EA55AADD31E9A3CAC4CF91EE5F173C597FB14480F7F3C0E6732A234E3229698C8B89D8445291EB53B4EA739B78

Or, download and import: physics 2200 virtual appliance 32 bit, ca 4GB, last updated Sep 8, 2016. 

MD5 Checksum:     C520BC1865AC4B28178CA3AF1E84A61F
SHA-1 Checksum:   194ECA390EDEDB6C13A7160317F64F9790FFA7B4
SHA-256 Checksum: 52F9A51F5DC23628D9932D28B646340F36D329ABFA0183F1572CC957DFB67956
SHA-512 Checksum: AFA305BFCBBC0007F00F72991370AA045A7BE90EBC6A38F30A45F48C32E03D628A89D8D6A6FEB69443B2C68299F063AEF521874B1F24502909A1501FBE1EE9E8

A checksum is a small-size datum used for the purpose of detecting errors which may have been introduced during a data file transmission or storage.

The actual procedure which yields the checksum, given a data input is called a checksum algorithm. A good checksum algorithm will usually output a significantly different value, even for small changes made to the input.

Checksum tools are installed on Mac and Linux by default. A Windows version of a checksum program is available at https://raylin.wordpress.com/downloads/md5-sha-1-checksum-utility/

Homework guidelines

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