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What is the length of an Identifier that is unique for Non-Global Variables and Non-Function Names.?
Q:

What is the length of an Identifier that is unique for Non-Global Variables and Non-Function Names.?

0

What is the length of an Identifier that is unique for Non-Global Variables and Non-Function Names?

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36

Explanation:

if 31 is present choose. Because old compilers support up to 31 only.

Upto first 63 characters you can show differentiation in the name of say 

int abcdefghijklmnopqrstuvwxyz1234567788= 10;

int abcdefghijklmnopqrstuvwxyz1234567799 = 20;

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