一光年等于63,420天文单位

#include "stdafx.h"
#include <iostream>

using namespace std;

double convert(double c)
{
 double fah = 63240*c;
 return fah;
}

int main()
{
 cout<<"Enter the number of light years: "<<endl;
 double c;
 cin>>c;
 cout<<c<<" light years = "<<convert(c)<<" astronomical units."<<endl;
 return 0;

}