* Now use a (non-raw) string literal for each line and a single call to`print()` with suitable escape characters.What happens if you remove all ofthestream insertion operators*except* for the first? (Explanation:*concatenation* of adjacent string literals is automatically performed by the pre-processor.)

* Now use a (non-raw) string literal for each line and a single call to`print()` with suitable escape characters.You concatenatethestring literals without any operator:*concatenation* of adjacent string literals is automatically performed by the pre-processor.

* Modify`01-title.cpp` to output the title of your favorite book or film centered on the console window (assume an 80 character fixed width, and change the size of the console window if different).

| char32_t| 32| UTF-32| U"abcd"| U'a'| UR"(abcd)"| u32string| n/a| no|

| wchar_t| 16/32| n/a +| L"abcd"| L'a'| LR"(abcd)"| wstring| wcout/wcerr| no|

&#42; An explicit cast to type`char` in`operator<<` may be required when using`cout`/`cerr`, for example:`cout <<static_cast<char>(u8"Hello \u20AC!\n");`.

&#42; An explicit cast to type`char` in`operator<<` may be required when using`cout`/`cerr`, for example:`cout <<reinterpret_cast<constchar*>(u8"Hello \u20AC!\n");`.

&#43; The`wchar_t` encoding and streams under Windows are 16-bit and support UTF-16.

#include<cmath>

constexprdouble PI1 = acos(-1.0);

constexprdouble PI2 =22.0 /7.0;

}

(Hint: this program is the first to require an additional header to`<print>`; you may need to add`-lm` to the compile command under Linux/MacOS in order to link in the math library containing the`acos()` function.)

(Hint: this program is the first to require an additional header to`<print>`; you may need to add`-lm` to the compile command under Linux in order to link in the math library containing the`acos()` function.)

**Experiment**