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TRINITY CSCI 1320 - Loops

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Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Loops10-10-2011Opening DiscussionMinute essay commentsMidterm covers topics through today.IcP selection is weighted by how many you have left to do.while LoopThe simplest loop is the while loop.while(condition) st at ementThe condition is evaluated first. If it is true the statement (possibly a block) executes.This repeats until the condition is false.do-while LoopThe partner to the while loop is the do-while loop.do {statement} while(condi t ion)This loop is post-check instead of the pre-check of the normal while loop.Always happens once.The while loop might never happen.The for LoopThe most commonly used loop in most languages is the for loop. The Scala version is a bit different from most.Often used for counting:for(i <- 1 to 10) { ... }In general it is a “for each” loop that goes through a collection.for(e <- coll) { ... }Variable takes on value of each element in the collection.Range TypeRange types provide an easy way to make collections for counting.“to” and “until” operate on numeric types to produce ranges.1 to 100 until 10Use “by” to change the stepping in a range.1 to 100 by 210 to 1 by -1'a' to 'z' by 3yieldThe for loop can be used as an expression if you put yield between the end of the for and the expression after it.for(e <- coll) yield ex prWhat you get back will be a collection that is generally of the same type as what you iterated over.if GuardsYou can put conditions in the for that will cause some values to be skipped.for(n <- nums; if(n%2==0)) ...Multiple GeneratorsYou can also put multiple generators in a for loop.for(i <- 1 to 10; j <- i to 10) ...You can combine as many generators and guards as you want. You can also declare variables in the middle of the for.The thing you assign into is like a val so it can be a “pattern”. We have only seen this with tuples so far.Multidimensional ArraysYou can have collections of collections. A common example would be something like Array[Array[Double]] to represent a matrix.Both fill and tabulate can be used to make these.val ident=Array.tabulate(3,3)((i,j) => if(i==j) 1.0 else 0.0)Minute EssayAny questions?Midterm is on Wednesday. The review session will be 5:00-6:00pm Monday here and 7:00-8:00 Tuesday on


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TRINITY CSCI 1320 - Loops

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