https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/lround-lroundf-lroundl-llround-llroundf-llroundl?view=msvc-170
lround, lroundf, lroundl, llround, llroundf, llroundl | Microsoft Learn
API reference for lround, lroundf, lroundl, llround, llroundf, and llroundl; which rounds a floating-point value to the nearest integer.
llroundfmicrosoftlearn
https://docs.oracle.com/cd/E88353_01/html/E37846/llroundf-3m.html
llroundf - man pages section 3: Extended Library Functions, Volume 2
llround , llroundf , llroundl - round to nearest integer value These functions rounds their argument to the nearest integer value, rounding halfway cases away...
man pagesextended libraryllroundfsectionfunctions