Question

The output of this example is …

HC:\Projects\cppexample.exeello world.

Why the path to the current executable was pushed in the string?

#ifndef UNICODE
#define UNICODE 
#endif


    #include <Windows.h>

    int main()
    {
        TCHAR string[255];
        string[0]=TEXT('H');
        wcscat(string,TEXT("ello world"));

        MessageBox(0,string,0,0);

        system("Pause");
        return 0;
    }

Answer 1

Because you did not end the “string” “H” with a null-byte. Therefore wcscat appends to where it finds the first null-byte in your (uninitialized) array, which happened to contain the executable path (and one byte of something else before that).