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What type of variables does the PROGMEM Utility work on?

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What type of variables does the PROGMEM Utility work on?

(a) Globally Defined or static

(b) Defined inside a function and non-static

(c) Defined inside a for-loop and non-static

(d) Defined inside a while-loop and non-static

I had been asked this question in class test.

The above asked question is from PROGMEM Utility in section Arduino Programming of Arduino

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Right answer is (a) Globally Defined or static

Explanation: The PROGMEM Utility can only be used for variables which have “public” access to the entire program and conversely can be accessed by anyone, or is a static variable, which means they need to be defined outside a function and be static or non-static, or if they are defined within any function, they need to be static.

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