#
# assert not 13.is_even
fun is_odd: Bool do return not is_even
+
+ # Returns the `self` raised to the power of `e`.
+ #
+ # assert 2 ** 3 == 8
+ fun **(e: Int): Int
+ do
+ return self.to_f.pow(e.to_f).to_i
+ end
+
+ # The factorial of `self` (aka `self!`)
+ #
+ # Returns `1 * 2 * 3 * ... * self-1 * self`
+ #
+ # assert 0.factorial == 1 # by convention for an empty product
+ # assert 1.factorial == 1
+ # assert 4.factorial == 24
+ # assert 9.factorial == 362880
+ fun factorial: Int
+ do
+ assert self >= 0
+ var res = 1
+ var n = self
+ while n > 0 do
+ res = res * n
+ n -= 1
+ end
+ return res
+ end
end
redef class Float
+
+ # Returns the non-negative square root of `self`.
+ #
+ # assert 9.0.sqrt == 3.0
+ # #assert 3.0.sqrt == 1.732
+ # assert 1.0.sqrt == 1.0
+ # assert 0.0.sqrt == 0.0
fun sqrt: Float is extern "kernel_Float_Float_sqrt_0"
+
+ # Computes the cosine of `self` (expressed in radians).
+ #
+ # #assert pi.cos == -1.0
fun cos: Float is extern "kernel_Float_Float_cos_0"
+
+ # Computes the sine of `self` (expressed in radians).
+ #
+ # #assert pi.sin == 0.0
fun sin: Float is extern "kernel_Float_Float_sin_0"
+
+ # Computes the cosine of x (expressed in radians).
+ #
+ # #assert 0.0.tan == 0.0
fun tan: Float is extern "kernel_Float_Float_tan_0"
+
+ # Computes the arc cosine of `self`.
+ #
+ # #assert 0.0.acos == pi / 2.0
fun acos: Float is extern "kernel_Float_Float_acos_0"
+
+ # Computes the arc sine of `self`.
+ #
+ # #assert 1.0.asin == pi / 2.0
fun asin: Float is extern "kernel_Float_Float_asin_0"
+
+ # Computes the arc tangent of `self`.
+ #
+ # #assert 0.0.tan == 0.0
fun atan: Float is extern "kernel_Float_Float_atan_0"
+
+ # Returns the absolute value of `self`.
+ #
+ # assert 12.0.abs == 12.0
+ # assert (-34.56).abs == 34.56
+ # assert -34.56.abs == -34.56
fun abs: Float `{ return fabs(recv); `}
+ # Returns `self` raised at `e` power.
+ #
+ # #assert 2.0.pow(0.0) == 1.0
+ # #assert 2.0.pow(3.0) == 8.0
+ # #assert 0.0.pow(9.0) == 0.0
fun pow(e: Float): Float is extern "kernel_Float_Float_pow_1"
+
+ # Returns the logarithm of `self`.
+ #
+ # assert 0.0.log.is_inf == -1
+ # #assert 1.0.log == 0.0
fun log: Float is extern "kernel_Float_Float_log_0"
+
+ # Returns **e** raised to `self`.
fun exp: Float is extern "kernel_Float_Float_exp_0"
# assert 1.1.ceil == 2.0
# assert 2.0.floor == 2.0
# assert (-1.5).floor == -2.0
fun floor: Float `{ return floor(recv); `}
+
+ # Rounds the value of a float to its nearest integer value
+ #
+ # assert 1.67.round == 2.0
+ # assert 1.34.round == 1.0
+ # assert -1.34.round == -1.0
+ # assert -1.67.round == -2.0
+ fun round: Float is extern "round"
# Returns a random `Float` in `[0.0 .. self[`.
fun rand: Float is extern "kernel_Float_Float_rand_0"
- fun hypot_with( b : Float ) : Float is extern "hypotf"
+ # Returns the euclidean distance from `b`.
+ fun hypot_with(b : Float): Float is extern "hypotf"
+
+ # Returns true is self is not a number.
fun is_nan: Bool is extern "isnan"
# Is the float an infinite value
end
end
+redef class Sys
+ init
+ do
+ srand
+ end
+end
+
+# Computes the arc tangent given `x` and `y`.
+#
+# assert atan2(-0.0, 1.0) == -0.0
+# assert atan2(0.0, 1.0) == 0.0
fun atan2(x: Float, y: Float): Float is extern "kernel_Any_Any_atan2_2"
+
+# Approximate value of **pi**.
fun pi: Float is extern "kernel_Any_Any_pi_0"
+
+# Initialize the pseudo-random generator with the given seed.
+# The pseudo-random generator is used by the method `rand` and other to generate sequence of numbers.
+# These sequences are repeatable by calling `srand_from` with a same seed value.
+#
+# ~~~~
+# srand_from(0)
+# var a = 10.rand
+# var b = 100.rand
+# srand_from(0)
+# assert 10.rand == a
+# assert 100.rand == b
+# ~~~~
fun srand_from(x: Int) is extern "kernel_Any_Any_srand_from_1"
+
+# Reinitialize the pseudo-random generator used by the method `rand` and other.
+# This method is automatically invoked at the begin of the program, so usually, there is no need to manually invoke it.
+# The only exception is in conjunction with `srand_from` to reset the pseudo-random generator.
fun srand is extern "kernel_Any_Any_srand_0"
nitlanguage / nit.git / blobdiff