2017 winter

Question

Q:

We consider:

Code	`IO.println("Result 1: " + 2.5 * 50 / 100); IO.println("Result 2: " + 50 / 100 * 2.5);`
Result	Result 1: 1.25 Result 2: 0.0

This seems to defy the rules of algebra: Why does a mere re-ordering yield a (totally) different result ? Explain both outcomes.

Answer 1

A:

Both operators “*” and “/” are being evaluated from left to right. In case of integer division this yields a zero net result:

2.5 * 50 / 100

2.5 * 50 / 100
  ↘  ↙     ↙
 125.0   ↙
    ↘  ↙
    1.25

50 / 100 * 2.5

50 / 100 * 2.5
  ↘  ↙     ↙
    0    ↙
    ↘  ↙
      0

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