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code hs karel cheat sheet, Cheat Sheet of Software Development

Stanford UniversitySoftware Development

Great code hs karel cheat sheet

Typology: Cheat Sheet

2018/2019
On special offer
30 Points
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Uploaded on 09/02/2019

ekavaria
ekavaria 🇺🇸

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KarelCheatSheet
OverviewofProgrammingFunctionality
ProgrammingMode1
●go…moveonestepforward.Note:Ifrobotcrashesintoawall,anerroristhrown
●right…turn90degreesright
●left…turn90degreesleft
●get…pickupagem.Note:Theremustbeagembeneaththerobot,oranerroris
thrown
●put…dropsagemontheground.Note:Erroristhrownifrobot’sbagisempty
●repeat…repeatacommandorsequenceofcommandsagivennumberoftimes
ProgrammingMode2
●ifelse…conditions
● sensors...wall,gem,north,empty,home
●not…negation
●while…dosomethingwhileconditionissatisfied
●def…definecustomcommands
ProgrammingMode3
● print…printcommandsameasinPython
○ forexampleprint“HelloWorld!”,orprint“a=”,a
●gpsx,gpsy…GPScoordinates,canbeassignedtoavariable
● integerandlogicalvariables…forexample,a=0createsanewvariableaand
initializesitwithzero
●inc(a),inc(a,value)…increasethevalueofvariableabyoneorvalue
●dec(a),dec(a,value)…decreasethevalueofvariableabyoneorvalue
●rand…returnsrandomlyTrueorFalse
●return…canbeusedincustomcommandstoreturnvalue
●and,or…logicaland,ortobeusedinconditions,whileloops,andlogicalvariables
● lists…functionalityrelatedtolistsisthesameasinPython
○L=[]createsanemptylistL
○len(L)…lengthoflistL
○L[i]…iteminlistLatpositioni.Note:Indexingstartsfromzero
○L.append(x)…appenditemxattheendoflistL
○x=L.pop()…removethelastiteminlistLandreturnit
○delL[i]…deleteitematpositioniinlistL
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Karel Cheat Sheet

Overview of Programming Functionality

Programming Mode 1

● go… move one step forward. Note: If robot crashes into a wall, an error is thrown ● right… turn 90 degrees right ● left … turn 90 degrees left ● get … pick up a gem. Note: There must be a gem beneath the robot, or an error is thrown ● put… drops a gem on the ground. Note: Error is thrown if robot’s bag is empty ● repeat … repeat a command or sequence of commands a given number of times

Programming Mode 2

● if else… conditions ● sensors ... wall, gem, north, empty, home ● not … negation ● while… do something while condition is satisfied ● def … define custom commands

Programming Mode 3

● print … print command same as in Python ○ for example print “Hello World!”, or print “a =”, a ● gpsx, gpsy … GPS coordinates, can be assigned to a variable ● integer and logical variables … for example, a = 0creates a new variable a and initializes it with zero ● inc(a), inc(a, value)… increase the value of variable aby one or value ● dec(a), dec(a, value)… decrease the value of variable aby one or value ● rand… returns randomly True or False ● return… can be used in custom commands to return value ● and, or… logical and, or to be used in conditions, while loops, and logical variables ● lists … functionality related to lists is the same as in Python ○ L = [] creates an empty list L ○ len(L)… length of list L ○ L[i]… item in list Lat position i. Note: Indexing starts from zero ○ L.append(x)… append item xat the end of list L ○ x = L.pop() … remove the last item in list Land return it ○ del L[i] … delete item at position i in list L