1: Another Pleasant Valley Saturday Understanding What Computers Really Do in .NET

Drawing QR Code ISO/IEC18004 in .NET 1: Another Pleasant Valley Saturday Understanding What Computers Really Do
1: Another Pleasant Valley Saturday Understanding What Computers Really Do
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"Quick, get the kids up, it's past 7 Nicky's got Little League at 9 and Dione's got ballet at 10 Mike, give Max his heartworm pill! (We're out of them, Ma, remember ) Your father picked a great weekend to go fishing Here, let me give you 10 bucks and go get more pills at the vet's My God, that's right, Hank needed gas money and left me broke There's a teller machine over by Kmart, and if I go there I can take that stupid toilet seat back and get the right one "I guess I'd better make a list " It's another Pleasant Valley Saturday, and thirty-odd million suburban homemakers sit down with a pencil and pad at the kitchen table to try and make sense of a morning that would kill and pickle any lesser being In her mind she thinks of the dependencies and traces the route: Drop Nicky at Rand Park, go back to Dempster and it's about 10 minutes to Golf Mill Mall Do I have gas I'd better check first-if not, stop at Del's Shell or I won't make it to Milwaukee Avenue Milk the teller machine at Golf Mill, then cross the parking lot to Kmart to return the toilet seat that Hank bought last weekend without checking what shape it was Gotta remember to throw the toilet seat in back of the van-write that at the top of the list By then it'll be half past, maybe later Ballet is all the way down Greenwood in Park Ridge No left turn from Milwaukee-but there's the sneak path around behind the Mall I have to remember not to turn right onto Milwaukee like I always do-jot that down While I'm in Park Ridge I can check and see if Hank's new glasses are in-should call but they won't even be open until 9:30 Oh, and groceries-can do that while Dione dances On the way back I can cut over to Oakton and get the dog's pills In about 90 seconds flat the list is complete: Throw toilet seat in van Check gas-if empty, stop at Del's Shell Drop Nicky at Rand Park Stop at Golf Mill teller machine Return toilet seat at Kmart Drop Dione at ballet (remember back path to Greenwood) See if Hank's glasses are at Pearle Vision-if they are, make double sure they remembered the extra scratch coating Get groceries at Jewel Pick up Dione Stop at vet's for heartworm pills Drop off groceries at home If it's time, pick up Nicky If not, collapse for a few minutes, then pick up Nicky Collapse! In what we often call a "laundry list" (whether it involves laundry or not) is the perfect metaphor for a computer program Without realizing it, our intrepid homemaker has written herself a computer program and then set out (acting as the computer) to execute it and be done before noon Computer programming is nothing more than this: You the programmer write a list of steps and tests
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The computer then performs each step and test in sequence When the list of steps has been executed, the computer stops A computer program is a list of steps and tests, nothing more
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Think for a moment about what I call a "test" in the preceding laundry list A test is the sort of either/or decision we make dozens or hundreds of times on even the most placid of days, sometimes nearly without thinking about it Our homemaker performed a test when she jumped into the van to get started on her adventure She looked at the gas gauge The gas gauge would tell her one of two things: (1) She has enough gas, or (2) no, she doesn't If she has enough gas, she takes a right and heads for Rand Park If she doesn't have enough gas, she takes a left down to the corner and fills the tank at Del's Shell (Del takes credit cards) Then, with a full tank, she continues the program by taking a U-turn and heading for Rand Park In the abstract, a test consists of those two parts: First, you take a look at something that can go one of two ways Then you do one of two things, depending on what you saw when you took a look Toward the end of the program, our homemaker got home, took the groceries out of the van, and took a look at the clock If it isn't time to get Nicky back from Little League, she has a moment to collapse on the couch in a nearly empty house If it is time to get Nicky, there's no rest for the ragged: She sprints for the van and heads back to Rand Park (Any guesses as to whether she really gets to collapse when the program is complete )
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