What is the decimal rounding function of C++?

This article mainly introduces the relevant knowledge of what the C++ decimal rounding function is, the content is detailed and easy to understand, the operation is simple and fast, and it has a certain reference value. I believe you will gain something after reading this C++ decimal integer function. Let's take a look.

In C++ 's cmath library, there are several decimal rounding functions ceil () floor () round () trunc, which we can choose according to different scenarios.

Ceil function: rounding up

Floor function: rounding down

Round function: rounding

Trunc function: rounding off the tail

Let's take a look at the characteristics of these functions in turn.

Ceil function

The ceil function is defined as follows. The function returns the smallest integer not less than the parameter arg, that is, rounding up.

Float ceil (float arg); double ceil (double arg)

We can use the following figure to describe it visually. The hollow indicates that the Abscissa Arg does not contain the value of the point, while the solid represents the value of the point.

Ceil function

An example:

# include # include int main () {/ / ceil std::cout