Let's consider a code example showing what would be allowed (or not) using different levels of inheritance: 1  class BaseClass {}; void freeStandingFunction(BaseClass* b); class DerivedProtected : protected BaseClass { DerivedProtected() { freeStandingFunction(this); // Allowed } };
Definition of Horizontal Axis. Horizontal means flat or level. Horizontal axis is the x-axis on a graph. The blue number line in the figure below is the x-axis, the horizontal axis.
The vertical line is nothing but a straight line drawn from top to bottom. Vertical line can be mostly used in graph. In graph vertical line is called as y-axis. The x-axis and y-axis can be seen in the graph.The point where the vertical and horizontal axis intersects each other is known as origin.The vertical and horizontal axis in the graph is defined as x-axis and y-axis. vertical line segment can be defined as a part of vertical line that is bounded by two points. The points are called the end points of the vertical line segment. The vertical line test is used to determine whether or not a graph is the graph of a function.