how do I insert letters into the answer?

I have the formula:

#include <iostream>
#include <cmath>
using namespace std;

int main()

double v,lo,l;
cout << "Enter the proper length (m)of an object" << endl;
cin >> lo;
cout << "Enter the proper length of the object relative to the observer" >> endl;
cin >> v;
l = lo * sqrt(1.0000-(pow(v,2.0000)/pow(299792458.0000,2.0000)));
cout << fixed << lo << endl;
cout << fixed << v << endl;
cout << fixed << l << endl;

return 0;
This works, but the output is: ans.0000
I need the answer as: lo = ans.0000
v = ans.0000
l = and.0000
How do I do this? I don't know how to get it without a compiling error.
cout << "v = " << fixed << lo << endl; That should fix your problem.
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