C++ Rounding Functions: ceil(), floor(), round()

In C++, different methods can be used to round integer values, depending on the specific rounding needs.

1. Use typecasting (C-style):

double num = 3.14159;
int intNum = (int)num; // 取整为3

1. Utilize the round() function in C++ (to round off).

double num = 3.14159;
int intNum = round(num); // 取整为3

1. Utilize the floor() function in C++ to round down.

double num = 3.14159;
int intNum = floor(num); // 取整为3

1. Use the ceil() function in C++ (rounding up):

double num = 3.14159;
int intNum = ceil(num); // 取整为4

Select the appropriate rounding method based on specific needs.