In C++, some of the following are legal identifiers. Which? Why?
a. 9xyz
b. Xyz
c. X+yz
d. xy_z
e. xyz!
a. 9xyz no – An identifier cannot start with a digit
b. Xyz yes. An identifier may have upper and lower case letters
c. X+yz no – This has an illegal ‘+’.
d. xy_z yes.
e. xyz! no – This has an illegal ‘!’.
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