https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/lrint-lrintf-lrintl-llrint-llrintf-llrintl?view=msvc-170
lrint, lrintf, lrintl, llrint, llrintf, llrintl | Microsoft Learn
API reference for lrint(), lrintf(), lrintl(), llrint(), llrintf(), and llrintl(); which rounds the specified floating-point value to the nearest integral...
lrintmicrosoftlearn
https://docs.oracle.com/cd/E88353_01/html/E37846/llrintl-3m.html
llrintl - man pages section 3: Extended Library Functions, Volume 2
llrint , llrintf , llrintl - round to nearest integer value using current rounding direction
man pagesextended librarysectionfunctionsvolume