VC++中取整函数和四舍五入的函数( 转)

试用强制类型转换怎样?比如:[INT]就是强制转换成整型

在math.h中包含了下面的函数可以使用其中ceil向上取整，floor向下取整。fmod用于求余数.
＃i nclude "math.h"
double ceil( double x );
    The ceil function returns a double value representing the smallest integer that is greater than or equal to x. There is no error return.
double floor( double x );
    The floor function returns a floating-point value representing the largest integer that is less than or equal to x.There is no error return.
double fmod( double x, double y );
    fmod returns the floating-point remainder of x / y. If the value of y is 0.0, fmod returns a quiet NaN. For information about representation of a quiet NaN by the printf family, see printf.

一般来说，四舍五入的方法是：

int(yournum+0.5)   
比如对小数点后第三位四舍五入保留两位：   
int(yournum*100+0.5)/100

或者用Round()函数