double dCXPercent = ( 0 == m_nOldCX ) 1 :( static_cast(cx)/m_nOldCX ); 0==m_nOldCX怎么理解?(m_nOldCX 是一整型变量)

double dCXPercent = ( 0 == m_nOldCX ) 1 :( static_cast(cx)/m_nOldCX ); 0==m_nOldCX怎么理解?(m_nOldCX 是一整型变量) double ** p=new double* #includeusing namespace std;#define PI 314159double area(double radius=0);double area(double a,double b);double area(double a,double b,double h);double area(double a,double b,double c,int);int main(){cout double max=Double.MIN_VALUE什么意思 double **Maze = new double *[8] double* xyz_scale = 0; double double double double double double double double Double double double double