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The macros exist for a reason; not all systems use the same integer values to signal success or failure. Although all systems that TGUI currently supports use a 0 return from main to indicate success and everything else as failure, that's not universal. For example, VMS uses 1 to indicate success. In the future TGUI may be ported to systems where the EXIT_SUCCESS/EXIT_FAILURE macros are relevant, so that's one reason to use them and also; they are just a lot more expressive/readable and make perfectly clear what's being returned, so that's another reason to use them.
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The macros exist for a reason; not all systems use the same integer values to signal success or failure. Although all systems that TGUI currently supports use a 0 return from main to indicate success and everything else as failure, that's not universal. For example, VMS uses 1 to indicate success.
In the future TGUI may be ported to systems where the EXIT_SUCCESS/EXIT_FAILURE macros are relevant, so that's one reason to use them and also; they are just a lot more expressive/readable and make perfectly clear what's being returned, so that's another reason to use them.