What is wrong with this c++ win32 code?

Question

I wrote this code:

And this error showed up:

why did it occur & how do I fix it?

Answer 1

From the text of the error message it seems that the error_message variable should be type wstring instead of string.

Answer 2

Hi @Vijayadithyan .N ,
Welcome to Microsoft Q&A!

A character literal that begins with the L prefix is a wide-character literal. As @RLWA32 said, you need to use wstring.
But std:string is a character literal.
If you want use std:string in your code, you need remove L.

string message = "123";  
string error_message = "Error" + message + "\n";  

Thank you,
Junjie

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