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abacus: bignum: add sqrt

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This commit is contained in:
Bruno BELANYI 2021-08-22 13:58:43 +02:00
parent d03058e410
commit f4f620436c
3 changed files with 77 additions and 0 deletions
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38
tests/unit/bignum.cc
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@ -338,3 +338,41 @@ TEST(BigNum, pow_negative) {
EXPECT_EQ(pow(minus_three, three), minus_twenty_seven);
EXPECT_EQ(pow(three, four), eighty_one);
}
TEST(BigNum, sqrt_zero) {
auto const zero = BigNum(0);
EXPECT_EQ(sqrt(zero), zero);
}
TEST(BigNum, sqrt_one) {
auto const one = BigNum(1);
EXPECT_EQ(sqrt(one), one);
}
TEST(BigNum, sqrt_truncation) {
auto const one = BigNum(1);
auto const two = BigNum(2);
auto const three = BigNum(3);
EXPECT_EQ(sqrt(two), one);
EXPECT_EQ(sqrt(three), one);
}
TEST(BigNum, sqrt) {
auto const two = BigNum(2);
auto const three = BigNum(3);
auto const four = BigNum(4);
auto const nine = BigNum(9);
auto const ten = BigNum(10);
auto const eighty_one = BigNum(81);
auto const ninety_nine = BigNum(99);
auto const hundred = BigNum(100);
EXPECT_EQ(sqrt(four), two);
EXPECT_EQ(sqrt(nine), three);
EXPECT_EQ(sqrt(eighty_one), nine);
EXPECT_EQ(sqrt(ninety_nine), nine);
EXPECT_EQ(sqrt(hundred), ten);
}