[Solved] Why doesn’t this code for Sutherland-Hodgeman Line Clipping algorithm giving incorrect output?

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You can use a std::vector without initializing its size and it supports random access. To add to an empty std::vector use push_back

std::vector<MyType> vec;
vec.push_back(MyType(10, 'a', "Hi"));
vec.push_back(MyType(20, 'b', "Hello"));
vec.push_back(MyType(30, 'c', "Bye"));

MyType t = vec[1];//20,'b', "Hello"...

Edit: This answer is for the question that was originally asked.

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solved Why doesn’t this code for Sutherland-Hodgeman Line Clipping algorithm giving incorrect output?