Having trouble with sprintf function and string class

Question

in my code, I was using string class to make an array to store my menu items

String menu[2] = {{"Menu 1"}, {"Menu2"}};

How do I convert this into char arrays and how do I call them?

Example:
Serial.println(menu[0]);

By the way, you can access a string. You call a function. You don't call a string. — Delta_G, Jun 18, 2020 at 17:59

Delta_G · Accepted Answer · 2020-06-19 14:57:19Z

2

Create them as char arrays like this:

const char* menu[2] = {"Menu 1", "Menu 2"};

and use them like this:

Serial.println(menu[0]);

answered Jun 18, 2020 at 17:58

Delta_G

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Strictly speaking it's an array of char*, not an array of char. And you should handle "Menu 1" as a const char*, to allow the compiler inhibit you doing nonsense. And avoid warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]
– DataFiddler
Jun 19, 2020 at 14:27
Edited for the const.
– Delta_G
Jun 19, 2020 at 14:57
It is an array of char*. And each one of those pointers points to a char array, not a String. My point there was to distinguish between char array and String object.
– Delta_G
Jun 19, 2020 at 14:59
Agreed. Even the warning text calls "hello" a string constant. But string (string literals aka const char array) and Arduino String Objects are so different that we should avoid using the term string completely.
– DataFiddler
Jun 20, 2020 at 11:19

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