Error: invalid operands of types ‘const char [35]’ and ‘const char [2]’ to binary ‘operator+’

Question

At the top of my file I have

#define AGE \"42\"

Later in the file I use ID multiple times including some lines that look like

Answer 1

In this particular case, an even simpler fix would be to just get rid of the "+" all together because AGE is a string literal and what comes before and after are also string literals. You could write line 3 as:

str += "Do you feel " AGE " years old?";

This is because most C/C++ compilers will concatenate string literals automatically. The above is equivalent to:

str += "Do you feel " "42" " years old?";

which the compiler will convert to:

str += "Do you feel 42 years old?";