57. Threshold Default Template Arguments

Write a function template thresholdOrDefault logic. 
It returns either the given value or a safe default:

template<typename T = int> 

T thresholdOrDefault(T v, T def = {})

• If v < 0, return def.
• Otherwise, return v.
   

The program already reads a value and optionally a default, and calls thresholdOrDefault.
 You only need to implement the template function.

Example
 Input:

5

Output:

5

Input:

-3

Output:

0

Input:

-3 100

Output:

100