double scaleFactor = 5.0f;这句话什么意思,为什么后面有个f,干什么用的

double scaleFactor = 5.0f;这句话什么意思,为什么后面有个f,干什么用的 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