#include <iostream>
using namespace std;

double integ(void) {
  cout << "no args to integ, integrating from 0 to 1"<<endl;
  return (1.0); // just test
} 

double integ(double & a,double & b) {
  cout << "two args to integ, integrating from "<<a<<" to "<<b<<endl;
  return (2.0);// just test
}


int main(){
  double a=5,b=10;
  integ();
  integ(a,b);
  return 0;
}