A function in Borland's graphics library in TurboC; switches to graphics mode.
To display graphics
Allows graphics processor to easily upgraded
C language doesn't say anything about graphics, it is platform-dependent.
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in graphics gdriver means graphics driver. it contains DETECT as an exception.
stretch
There is no such function as sector in C++. You probably mean the sector function that was originally provided by Borland's Graphic Interface library (BGI), now owned by Embarcadero, but you won't find this function in any standard implementation of C++ since all graphics coding is platform-dependent. That is, C++ is intended to be generic and therefore has no built-in graphics support whatsoever; you have to use a graphics API and library that supports your specific platform's graphics devices. That said, the Borland/Embarcadero version of the sector function is typically used to draw and fill a pie-chart segment of an elipse (or circle). As such it probably isn't the best function for drawing stylised clouds. You'd probably be better off using a series of arc functions instead.
bgi in computer graphics means "borland graphics interface", these r the files which contains information about all the graphics funtion.
format mean style
Compilers have nothing to do with graphics. Compilers translate source code into object code, nothing more. Graphics is hardware-dependant and is a function of a graphics library specific to that hardware. Graphics libraries do not need to be compiled, they simply need to be linked to your code.
If you mean how do you draw a curve in C++, you can't. C++ does not have any built-in graphics support of any kind. All graphics are platform-specific so, to be able to draw graphics, you need a graphics API and library suitable for your platform and hardware. As a result, the code you use will not be portable. In most graphics libraries you will draw curves as a series of arcs, so you want to look up the arc() function in your library documentation.