A program is set of instruction given by user to computer to perform a specific task.computer program, in depth intend or else process in lieu of solving a riddle by means of a computer; supplementary specifically, an unambiguous, well thought-out string of computational advice indispensable near attain such a solution.
#include<iostream>#include <string>#include<math.h>using namespace std;class circle{private: float pi,r,area;public: void caluclation();};void circle::caluclation(){pi=3.14;cout<<"please enter the radius of circle"<<endl;cin>>r;area=pi*r*r;cout<<"Are of circle is "<<area<<endl;}int main(){circle obj;obj.caluclation();}