计算机程序设计基础——精讲多练C/C++语言程序的基本结构1、在屏幕上显示如下图形: * * Hello World * #include using namespace std; int main() { cout<<""< Hello World *"<"< using namespace std; int main() { double x,y,sum,sub,mult,div; cout<<"Please enter the two Numbers for calculation:"; cin>>x>>y; sum=x+y; sub=x-y; mult=xy; div=x/y; cout<"< #include using namespace std; int main(){ double a,b,c; cout<<"Please enter two right edge of the right triangle:"; cin>>a>>b; c=sqrt(aa+bb); cout<<"Calculation results:hypotenuse c="<