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A hardcode is a part of a computer program which cannot be altered in any way except by changing the source code of the program itself.
This means that if the software has already been compiled and made into an executable, the hardcoded portion of the program stays constant no matter what is done to the software. This is usually done for certain fixed parameters and values that should always be constant, like Pi or the speed of light.
The process of creating a hardcode is known as hardcoding.
Techopedia Explains Hardcode
Only certain portions of a program can be hardcoded and the most basic examples are constant values, especially those used in the sciences like physics and chemistry, as well as math in general. A hardcode has one purpose, and that is to ensure that the value being hardcoded cannot be changed during run time of a program.
Some developers consider hardcoding to be a bad programming practice, but it does have some merits and appropriate uses. For example, sometimes unique serial numbers are hardcoded to software to ensure validity of the copy.
