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POShortening if statement with repetition
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2013-10-17T20:56:59.830
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<p>Below are some if statements for passing the pilot of a robot the correct directions based on where he in on a map and what direction he's facing. There a bit if repetition, but when i tried to combine conditionals the program stopped working. Any tips for shortening this?</p> <pre><code> int changeX= x-lowest.getX(); int changeY= y-lowest.getY(); if(changeX!=0){ System.out.println("x changed"); if(changeX<0 && robot.getFacing()== 'N'){ robot.checkDirection('L','W'); } else if(changeX<0 && robot.getFacing()== 'W'){ robot.checkDirection('L','W'); }else if(changeX<0 && robot.getFacing()== 'S'){ robot.checkDirection('R','W'); }else if(changeX<0 && robot.getFacing()== 'E'){ robot.checkDirection('R','W'); }else if (changeX>0 && robot.getFacing()== 'S'){ robot.checkDirection('L','E'); }else if (changeX>0 && robot.getFacing()== 'E'){ robot.checkDirection('L','E'); }else{ robot.checkDirection('R', 'E'); } }else{ System.out.println("y changed"); if(changeY<0 && robot.getFacing()== 'N'){ robot.checkDirection('L','S'); }else if(changeY<0 && robot.getFacing()== 'W'){ robot.checkDirection('L','S'); }else if(changeY<0 && robot.getFacing()== 'E'){ robot.checkDirection('R','S'); }else if(changeY<0 && robot.getFacing()== 'S'){ robot.checkDirection('R','S'); }else if (changeY>0 && robot.getFacing()== 'S'){ robot.checkDirection('L','N'); }else if (changeY>0 && robot.getFacing()== 'E'){ robot.checkDirection('L','N'); }else{ robot.checkDirection('R','N'); } } //change the current cell and the x/y currentCell = lowest; x=lowest.getX(); y=lowest.getY(); if(goal()){ moving=false; System.out.println("Goal Achieved!"); } } } </code></pre>
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<java><if-statement>
Title
Shortening if statement with repetition
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1. USFred V
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1. COwhat do you mean by _itstoped working_?
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  POShortening if statement with repetition
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  USPhilipp Sander
2. COI would use one expression to work out whether the first argument to `checkDirection` should be L or R; then another expression to work out whether the second argument should be N, S, E or W. I'd have just a single call to `checkDirection` after doing that.
  singulars
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  POShortening if statement with repetition
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  USDawood ibn Kareem

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