A plus sign is the symbol used for addition in Mathematics. Usually, the plus sign is written as a cross of horizontal and vertical lines. Using OpenGL, design and code an example of a plus sign. You can make the plus sign move backward, forward, going to the top or going down with the use of arrow keys in the keyboard. By pressing the plus sign (+), the program will enlarge or magnify the plus sign while by pressing the minus sign (-), the plus sign will be reduced or decrease. Also, if the space key is pressed, then the plus sign will be rotated by a certain degree or angle. If the enter key is pressed, the plus sign will randomly change its color. Save your file as plussign.cpp.

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