write a code in C++

1. Input data: data could be two letters, numbers or points ( call this twice to get two things)
2. Determine the distance. The distance could be ;

Between two letters, between two numbers or between two points on a graph

For example: distance between b and f is 4

Distance between (-2, 2) is 4

Distance between two points (0.0,0.0,1.0,1.0) is 1.41421

Sqrt((x2-x1)^2 + (y2-y1)^2)

3. Display the result.