# Returns the result of a binary AND operation on `self` and `i`
#
# assert 0x10 & 0x01 == 0
- fun &(i: Int): Int is intern do return band(i)
-
- private fun band(i: Int): Int `{ return self & i; `}
+ fun &(i: Int): Int is intern `{ return self & i; `}
# Returns the result of a binary OR operation on `self` and `i`
#
# assert 0x10 | 0x01 == 0x11
- fun |(i: Int): Int is intern do return bor(i)
-
- private fun bor(i: Int): Int `{ return self | i; `}
+ fun |(i: Int): Int is intern `{ return self | i; `}
# Returns the result of a binary XOR operation on `self` and `i`
#
#
# assert 3.is_prime
# assert not 1.is_prime
- # assert not 12.is_prime
+ # assert not 15.is_prime
fun is_prime: Bool
do
if self == 2 then
else if self <= 1 or self.is_even then
return false
end
- for i in [3..self.sqrt[ do
+ for i in [3..self.sqrt] do
if self % i == 0 then return false
end
return true
end
return res
end
+
+ # Is `self` a power of two ?
+ #
+ # ~~~nit
+ # assert not 3.is_pow2
+ # assert 2.is_pow2
+ # assert 1.is_pow2
+ # assert not 0.is_pow2
+ # ~~~
+ fun is_pow2: Bool do return self != 0 and (self & self - 1) == 0
end
redef class Byte
# Returns the result of a binary AND operation on `self` and `i`
#
# assert 0x10u8 & 0x01u8 == 0u8
- fun &(i: Byte): Byte is intern do return band(i)
-
- private fun band(i: Byte): Byte `{ return self & i; `}
+ fun &(i: Byte): Byte is intern `{ return self & i; `}
# Returns the result of a binary OR operation on `self` and `i`
#
end
end
-# Computes the arc tangent given `x` and `y`.
+# Computes the arc tangent given `y` and `x`.
#
# assert atan2(-0.0, 1.0) == -0.0
# assert atan2(0.0, 1.0) == 0.0
-fun atan2(x: Float, y: Float): Float `{ return atan2(x, y); `}
+fun atan2(y: Float, x: Float): Float `{ return atan2(y, x); `}
# Approximate value of **pi**.
fun pi: Float do return 3.14159265
# assert 10.rand == a
# assert 100.rand == b
# ~~~~
-fun srand_from(x: Int) `{ nit_rand_seeded = 1; nit_rand_seed = x; `}
+fun srand_from(x: Int) `{ nit_rand_seeded = 1; nit_rand_seed = (unsigned int)x; `}
# 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 `{ nit_rand_seeded = 0; srand(time(NULL)); `}
+fun srand `{ nit_rand_seeded = 0; srand((unsigned int)time(NULL)); `}