Difference between ' & "

I have a basic program:

Code:

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char chTest;
    chTest = 'a';
    qDebug() << chTest;

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However if I use "a", it spits out an error at me - 47: error: invalid conversion from 'const char*' to 'char'

What does that error mean? And why does it occur?

Code:

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char c = 'a'; // one character
char *str = "a"; // string literal

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Quote:

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However if I use "a", it spits out an error at me - 47: error: invalid conversion from 'const char*' to 'char'

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Error says it, keeping the const qualifier aside in the error ouput, looks like you are converting from 'char' to 'char*'.

'char' and 'char*' are different types and cannot be assigned / implicitly converted.

When you bring in const back in discussion. One can convert 'const char*' to 'char*', but other way 'char*' to 'const char*', is not implicitly possible.