C/C ++ obtains the entire function Ceil (), floor ()

Use the floor function. Floor (x) returns the largest integer less than or equal to X.
For example, floor (10.5) = 10 floor (-10.5) =-11

Use the ceil function. Ceil (x) returns the smallest integer greater than X.
For example, Ceil (10.5) = 11 Ceil (-10.5) =-10

Floor () is rounded to negative infinity, floor (-10.5) =-11;
Ceil () is rounded to positive infinity, Ceil (-10.5) =-10

 

Fix

Integer in the zero direction, for example, fix (-1.3) =-1; fix (1.3) = 1;

Floor

Integer toward negative infinity, such as floor (-1.3) =-2; floor (1.3) = 1;

Ceil

Returns an integer in the positive infinity direction, for example, Ceil (-1.3) =-1; Ceil (1.3) = 2;

Round

Round to the nearest integer, such as round (-1.3) =-1; round (-1.52) =-2; round (1.3) = 1; round (1.52) = 2