using Cpp only

Declare a struct point with 2 member variables x and y(integers) to indicate the coordinate of a given point.

a. (5 pts) Write a function isIdentical to check whether 2 given points are the same

b. (5 pts) Write a function distance2Points to calculate the distance between 2 given points

c. (10 pts) Write a function isTriangle to check whether 3 given points form a triangle