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Message: [QUOTE="Josh Holland, post: 4053377"] I really shouldn't reply, but I just have to. Firstly, saying "C should reject all-caps" is irrelevant, as there is no reference implementation for C, as there is for C# or Python (say). For that matter, the closest thing to a reference implementation on Un*x platforms, gcc, does reject all caps. $ cat caps.c #include <STDIO.H> int main(int argc, char *argv[]) { printf("Hello world!\n"); return 0; } $ gcc -Wall -Wextra -ansi -pedantic caps.c caps.c:1:19: error: STDIO.H: No such file or directory cc1: warnings being treated as errors caps.c: In function â€˜mainâ€™: caps.c:5: error: implicit declaration of function â€˜printfâ€™ caps.c:5: error: incompatible implicit declaration of built-in function â€˜printfâ€™ caps.c:3: error: unused parameter â€˜argcâ€™ caps.c:3: error: unused parameter â€˜argvâ€™ $ [/QUOTE]