how to use floor function in c++ code example

Example 1: floor in c++

floor(x):This function in C++ returns the largest possible integer value which is smaller
than or equal to the given argument.
Input : 2.5 ,-2.1 ,2.9
Output : 2 ,-3, 2

Example 2: floor() in c++

floor(x):This function in C++ returns the smallest possible integer value which is smaller
 than or equal to the given argument.
Input : 2.5 ,-2.1 ,2.9
Output : 2 ,-3, 2