[Solved] C++ : write a triangle class using point class [closed]

Question

It won’t work because the triangle constructor will attempt to default construct its point members before assigning to them, but point doesn’t have a default constructor. This is because you provide only a point constructor that takes 2 arguments, so the defaulted default constructor is deleted.

Instead, you should use a member initialization list to initialise the points:

dreieck(point varp1, point varp2, point varp3)
  : p1(varp1), p2(varp2), p3(varp3)
{ }

This initialises each of the members p1, p2, and p3 with the arguments varp1, varp2, and varp3 respectively, therefore avoiding the default construction.

Accepted Answer

It won’t work because the triangle constructor will attempt to default construct its point members before assigning to them, but point doesn’t have a default constructor. This is because you provide only a point constructor that takes 2 arguments, so the defaulted default constructor is deleted.

Instead, you should use a member initialization list to initialise the points:

dreieck(point varp1, point varp2, point varp3)
  : p1(varp1), p2(varp2), p3(varp3)
{ }

This initialises each of the members p1, p2, and p3 with the arguments varp1, varp2, and varp3 respectively, therefore avoiding the default construction.