FreeBSD Manual Pages
std::lcm(3) C++ Standard Libary std::lcm(3) NAME std::lcm - std::lcm Synopsis Defined in header <numeric> template< class M, class N > (since C++17) constexpr std::common_type_t<M, N> lcm( M m, N n ); Computes the least common multiple of the integers m and n. If either M or N is not an integer type, or if either is (possibly cv-qualified) bool, the program is ill-formed. The behavior is undefined if |m|, |n|, or the least common multiple of |m| and |n| is not representable as a value of type std::common_type_t<M, N>. Parameters m, n - integer values Return value If either m or n is zero, returns zero. Otherwise, returns the least common multiple of |m| and |n|. Exceptions Throws no exceptions. Notes Feature-test macro Value Std Feature __cpp_lib_gcd_lcm 201606L (C++17) std::gcd, std::lcm Example // Run this code #include <iostream> #include <numeric> #define OUT(...) std::cout << #__VA_ARGS__ << " = " << __VA_ARGS__ << '\n' constexpr auto lcm(auto x, auto... xs) { return ((x = std::lcm(x, xs)), ...); } int main() { constexpr int p{2 * 2 * 3}; constexpr int q{2 * 3 * 3}; static_assert(2 * 2 * 3 * 3 == std::lcm(p, q)); static_assert(225 == std::lcm(45, 75)); static_assert(std::lcm( 6, 10) == 30); static_assert(std::lcm( 6, -10) == 30); static_assert(std::lcm(-6, -10) == 30); static_assert(std::lcm( 24, 0) == 0); static_assert(std::lcm(-24, 0) == 0); OUT(lcm(2 * 3, 3 * 4, 4 * 5)); OUT(lcm(2 * 3 * 4, 3 * 4 * 5, 4 * 5 * 6)); OUT(lcm(2 * 3 * 4, 3 * 4 * 5, 4 * 5 * 6, 5 * 6 * 7)); } Output: lcm(2 * 3, 3 * 4, 4 * 5) = 60 lcm(2 * 3 * 4, 3 * 4 * 5, 4 * 5 * 6) = 120 lcm(2 * 3 * 4, 3 * 4 * 5, 4 * 5 * 6, 5 * 6 * 7) = 840 See also gcd computes the greatest common divisor of two integers (C++17) (function template) http://cppreference.com 2024.06.10 std::lcm(3)
NAME | Synopsis | Parameters | Return value | Exceptions | Notes | Example | Output: | See also
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=std::lcm&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>