The Math Object
Finally, let’s look at the Math object. They say a code example is worth 1,000 words:
puts(Math::PI) |
puts(Math::E) |
puts(Math.cos(Math::PI/3)) |
puts(Math.tan(Math::PI/4)) |
puts(Math.log(Math::E**2)) |
puts((1 + Math.sqrt(5))/2) |
3.141592653589793 |
2.718281828459045 |
0.5000000000000001 |
0.9999999999999999 |
2.0 |
1.618033988749895 |
The first thing you noticed was probably the :: notation. Explaining the scope operator (which is what that is) is beyond the…uh…scope of this book. No pun intended. I swear. Suffice it to say, you can use Math::PI like it were any other variable.
As you can see, Math has all the features you would expect a decent scientific calculator to have. And, as always, the floats are really close to being the right answers but not exact; don’t trust them further than you can calculate them.
Copyright © 2014, The Pragmatic Bookshelf.
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