I want to know how the “isupper” macro is defined in C/C++. Could you please provide me the same or point me to available resources. I tried looking at ctype.h but couldnt figure it out.
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I want to know how the “isupper” macro is defined in C/C++. Could you please provide me the same or point me to available resources. I tried looking at ctype.h but couldnt figure it out.
It’s implementation defined — every vendor can, and usually does, do it differently.
The most common usually involves a “traits” table – an array with one element for each character, the value of that element being a collection of flags indicates details about the character. An example would be:
In which case,, isupper() would be something like: