求圆的周长和面积
#include "iostream。h" double pi=3。 14159,girth;double area(double r) { double s; s=r*r*pi; return s; } double fun(double r) { girth=2*pi*r; return girth;} void main() { int r; cin>>r; cout<<"girth="<<fun(r)<<" "<<"area="<<area(r)<...全部
#include "iostream。h" double pi=3。
14159,girth;double area(double r) { double s; s=r*r*pi; return s; } double fun(double r) { girth=2*pi*r; return girth;} void main() { int r; cin>>r; cout<<"girth="<<fun(r)<<" "<<"area="<<area(r)<<endl; }。收起