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v/vlib/math/math_test.v

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module math
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fn tst_res(str1 string, str2 string) bool {
if (math.abs(str1.f64() - str2.f64())) < 1e-5 {
return true
}
return false
}
fn test_gcd() {
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assert gcd(6, 9) == 3
assert gcd(6, -9) == 3
assert gcd(-6, -9) == 3
assert gcd(0, 0) == 0
}
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fn test_lcm() {
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assert lcm(2, 3) == 6
assert lcm(-2, 3) == 6
assert lcm(-2, -3) == 6
assert lcm(0, 0) == 0
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}
fn test_digits() {
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digits_in_10th_base := digits(125, 10)
assert digits_in_10th_base[0] == 5
assert digits_in_10th_base[1] == 2
assert digits_in_10th_base[2] == 1
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digits_in_16th_base := digits(15, 16)
assert digits_in_16th_base[0] == 15
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negative_digits := digits(-4, 2)
assert negative_digits[2] == -1
}
fn test_erf() {
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assert erf(0) == 0
assert erf(1.5) + erf(-1.5) == 0
assert erfc(0) == 1
assert erf(2.5) + erfc(2.5) == 1
assert erfc(3.6) + erfc(-3.6) == 2
}
fn test_gamma() {
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assert gamma(1) == 1
assert gamma(5) == 24
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sval := '2.453737'
assert tst_res(log_gamma(4.5).str(), sval)
assert tst_res(log(gamma(4.5)).str(), sval)
//assert log_gamma(4.5).str() == sval
//assert log(gamma(4.5)).str() == sval
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assert abs( log_gamma(4.5) - log(gamma(4.5)) ) < 0.000001
// assert log_gamma(4.5) == log(gamma(4.5)) /* <-- fails on alpine/musl
}
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fn test_mod() {
assert 4 % 2 == 0
x := 2
assert u64(5) % x == 1
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mut a := 10
a %= 2
assert a == 0
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}
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fn test_copysign() {
assert copysign(5, -7) == -5.0
assert copysign(-5, 7) == 5.0
assert copysign(-5, -7) == -5.0
assert copysign(10, 0) == 10.0
assert copysign(10, 10) == 10.0
}