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.
However, we've probably been doing so on charts that look like this: But since we're blasting ahead in math, we'll soon be graphing on charts that look like this: This is called a Cartesian coordinate graph. It's made up of two axes (axes is just the plural of axis): The horizontal axis is called the x-axis. And the vertical one is the y-axis. When the two axes meet, they form four quadrants.