Loops and Conditionals
End of line is end of statement. • Statements at the same indentation level are in the same block (e.g. within a loop or condition). • End of indentation.
Nopol: Automatic Repair of Conditional Statement Bugs in Java
2 juin 2016 Then NOPOL analyzes program statements that are executed by failing test cases to identify the source code locations where a patch may be ...
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https://www.nyu.edu/classes/jcf/CSCI-GA.2110-001/slides/session3/ControlStructures-LoopsConditionalsAndCaseStatements.pdf
Matlab Sheet 4 Conditional Statements and Loops
Matlab Sheet 4. Conditional Statements and Loops. 1. It is desired to compute the sum of the first 10 terms of the series. 14 3 ? 20 2 + 5 .
5-1 Boolean expressions
Move a rectangle across a window by incrementing a variable. Start the shape at x coordinate 0 and use an if statement to have it stop at coordinate 100.
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http://www.math.montana.edu/ahoegh/teaching/stat408/lecturematerials/Lecture4.pdf
Going From C to MIPS Assembly Basic Operations: Loops
This is because the conditional statement is also a branch command. If the condition is met the code branches to the then block otherwise it continues on to
Conditional Statements Conditional statements The if statement The
Conditional statements. • Within a method we can alter the flow of control. (the order in which statements are executed) using either conditionals or loops
Matlab Sheet 4 - Solution Conditional Statements and Loops
Mechanical Engineering Department. Dr./ Ahmed Nagib Elmekawy. 1 of 23. Matlab Sheet 4 Solution. Matlab Sheet 4 - Solution. Conditional Statements and Loops.
Lists loops and conditional statements in R - Introduction to
Lists loops and conditional statements in R. Introduction to Computational BioStatistics with R. Alexey Fedoseev. September 28
Relational Operators•These operators compare the value of two 'expressions' and returns a Boolean value.•Bewareofcomparing across data types, especially when reading values in from command line orfiles.
Relational Operators==equalTrue if expressions are equal!=not equalTrue if expressions are not equal>Greater thanTrueifleft is greater than the right
Assignment Operators•A += Bincrease A by value of B•A -= Bdecrease A by value of B •A *= BmultiplyA byB and assign value to A•A /= Bdivide A by B and assign value to A•A **=Braise value of A to the power of B•A %= Bmodulus of A by B, assigned to A•A //= BfloorofA divided by B, assigned to A•String context:•S1+= S2add string on right to the one on left•S1 *= AMake A copies of S1 and concatenate them to S1
Boolean OperatorsCombinestwo or more statements that return a Boolean value.A and BTrue if both A and B are trueA or BTrue if either A or B is truenot Areverse the Boolean given by Axor(A,B)Trueifonly one of A or B is TrueABA and BA or BNot Axor(A,B)TRUETRUETRUETRUEFALSEFALSETRUEFALSEFALSETRUEFALSETRUEFALSETRUEFALSETRUETRUETRUEFALSEFALSEFALSEFALSETRUEFALSE
General Python Syntax rules•End of line is end of statement•Statements at the same indentation level are in the same block (e.g., within a loop or condition)•Endofindentation•Exceptions:•Semi colon ; separates statements on the same line•Single line blocks are allowed without indentation
Branching logic•Used to implement alternate paths for the logic flow.https://upload.wikimedia.org/wikipedia/commons/4/44/LampFlowchart.png
If/elif/else statementsif test1:statement 1eliftest2:statement 2else:statement 3•Both the elifand else blocks are optional.
If/elif/else statements
Lamp flowchart with if/elseAcceptsinputfromuser, as astringTruth and Boolean tests in Python•All objects in python have an inherent true or false value.•Anynonempty object istrue. •For Integers : Any non-zero number is true•Zero,empty objects and special object 'None' are false.•Comparisonsreturnthe values True or False
Loops/Iterations•Aloop is syntax structure that repeats all the statements within the loop until the exit condition is met.•Statements in a loop aredefined by indenting them relative to the loop start.•Loop ends when indentation ends.•Python has two forms of loops: for loop and while loop.•E.g. >>> for x in range(10)•E.g. >>>while (A==10)
while loops•while condition:statement 1statement 2..•Mostgenericformofloop,thatchecks whether the condition is true at the start of each iteration.•Expects the condition to become false at some point during the iterations of the loop.•Ifcondition is never changed, this creates an 'infinite' loop. i.e.,theprogramwillgetstuckinthisloop for ever.
Example while loops
Altering while loops•Normal loop control will execute all statements in block on every iteration. Loop endsonlywhenexit condition is met.•break statement forces the current loop to exit.•continue statement skips the rest of the block and goes to the next iteration of the loop.•pass statementisaplaceholder forempty blocks.
Altering while loops
for loops•for item in sequence:statement 1statement 2..•Genericiteratorforitems in a ordered sequence such as lists, tuples etc.•On each iteration retrieves one item from thelistandassignsittothevariable specified.•Automatically moves to the next item in the order.•Value of variable maybealteredwithintheforloop,butchange isnotmade in the list.
for loopsLooping over StringsandLists•List is a general sequence object while String is a character sequence object.•Bothcanbeiterated over by a for loop:
Looping over lists with and without index•Looping with an index allows accessing the item within the list and changing it.
Looping over Tuples and Dictionaries
Nested Loops•Loops can be nested just like the if/else statements.•Indentationisagainthekey to creating nested loops.•Ina2 level nested loopwithxiterationsontheouterloopandyiterations in the inner loop:•Allstatements in the outer loop will be executed x times•All statements in the inner loop will be executed x*y times
MultiDimensionalListsmyqDList : [[ltqtutc]t[btjtwth]t[.tl•tlltlq]t[lutlctlbtlj]]lqucbjwh.l•lllqlulclbljmyqDList•lqu•qlu
Lopingn vernSetpsnrirmyqDList : [[ltqtutc]t[btjtwth]t[.tl•tlltlq]t[lutlctlbtlj]]for xinrangevlenvmyqDListeeBinsideList:myqDList[x]lqucbjwh.l•lllqlulclbljmyqDList•lqu•qlu
Lopingn vernSetpsnrirmyqDList : [[ltqtutc]t[btjtwth]t[.tl•tlltlq]t[lutlctlbtlj]]for xinrangevlenvmyqDListeeBfor y in rangevlenvmyqDList[x]eeBprintmyqDList[x][y]lqucbjwh.l•lllqlulclbljmyqDList•lqu•qlu
Arbitrary dimensional ListssubL: [[ÕpÕtÕqÕ]t[ÔrÕtÕsÕ]]myqDList : [[ltqtutÕaÕ]t[btjtwtÕcatÕ]t[.tl•tÕeÕtlq]t[ÕbetaÕtlctlbtsubL]]lquabjwcat.l•elqbetalclbmyqDList•lqupqrs•qlu•l•lLoop1Loop2Loop3
Summary: Conditions and loops•Conditional statements with the proper comparison and booleanoperators allow the creation of alternate execution paths in the code.•Loopsallowrepeatedexecutionofthesame set of statements on all the objects within a sequence.•Usinganindexbasedforloopisbestsuited for making changes to items within a list.•Alwaysensurethatyourexitconditionwillbemet.
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