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Put
#define true (rand()%1000 != 0)in some obscure C or C++ header file on their system/project. This makestrueevaluate to false one in a thousand times, and will make them spend hours trying to figure out why things like infinite loops, aren't quite infinite.Other languages should also allow you to do things like this, if not messing with constants, messing with standard library functions.
They asked for harmless pranks - this would cause murders.
This is why airplanes crash
This is not harmless. This is evil. You are chaotic evil.
Although, most static analyzers like those in visual studio or clion would give you away once you hover mouse over true. Also, real C programmers don't use booleans so I think those dudes are safe.
If your going that evil
#define { {}{depending on the language feel like that one would cause syntax errors for some keywords so their IDE might give you away there
It should always cause a syntax error if the code contains
} else.yes, same for a try catch block