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Exponentiation order: Difference between revisions
Add swift
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Line 992:
. mata (5^(3^2))
1953125</lang>
=={{header|Swift}}==
Swift doesn't have an exponentiation operator, however it's possible to define one, including the precedence and associativity.
<lang swift>precedencegroup ExponentiationPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
infix operator ** : ExponentiationPrecedence
@inlinable
public func ** <T: BinaryInteger>(lhs: T, rhs: T) -> T {
guard lhs != 0 else {
return 1
}
var x = lhs
var n = rhs
var y = T(1)
while n > 1 {
switch n & 1 {
case 0:
n /= 2
case 1:
y *= x
n = (n - 1) / 2
case _:
fatalError()
}
x *= x
}
return x * y
}
print(5 ** 3 ** 2)
print((5 ** 3) ** 2)
print(5 ** (3 ** 2))</lang>
{{out}}
<pre>15625
15625
1953125</pre>
=={{header|Tcl}}==
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