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You don't need it in any other function, and global variables are bad. Leave it local but make it static. It will live like a global variable (whole program execution lifespan, initialized only...

Yes, but this doesn't help, since 'state' is an automatic local variable, which gets initialized to 0 every time the processor enters the function. If the compiler follows the rules of the language,...

puts ( strchr("aeiouy",lett) ? "vowel" :
lett>='a' && lett<='m' ? "consonant not after m" :
lett>'m' && lett<='z' ? "consonant after m" :
...

I don't know where is the bottleneck, but...


First, you can reorganize this:




key = 0;
if ((adc > 205) && (adc < 235 )) key = 1;