#include <iostream>
#include <math.h>
using namespace std;
#define PI 3.1415926 //定义π
struct vect
{
double x;
double y;
double z;
};
int main()
{
vect a,b;
double tt,kk,sum;
cout<<"please input the coordinate a:";
cin>>a.x>>a.y>>a.z;
cout<<"please input the coordinate b:";
cin>>b.x>>b.y>>b.z;
tt=a.x*a.x+a.y*b.y+a.z*a.z;
kk=b.x*b.x+b.y*b.y+b.z*b.z;
kk=sqrt(tt+kk);
tt=a.x*b.x+a.y*b.y+a.z*b.z;
sum=tt/kk;
sum=acos(sum);
tt=sum/PI;
cout<<"the corner is: "<<sum<<endl;
cout<<"the corner is: "<<tt<<"PI“<<endl;
return 0 ;
}
运行结果示例:
#define PI 3.1415926 //定义π 这句是不是可以省略的?
追答可以省略的,没有用到