A secret C++ question ( 5 )

Question

What is the output of this code?
cout<< sizeof("Solo");
cout<< strlen("Learn");
My answer is 45 but the right answer is 55 😭

Answer 1

because sizeof count '\0' or null terminated character which is automatically added on the end of every string

Answer 2

Thanks，I am so foolish...

Answer 3

I also would've said 45 to be honest.
I don't know for sure, but I guess a string directly used in sizeof (I mean without variable) contains a terminator ('\0'), while strings (datatype string) doesn't need this, because it is limited by the allocated memory for the variable.

string str = "solo";
cout << sizeof(str); //-> 4 bytes allocated => output 4
cout << sizeof("solo"); //-> 5 bytes, because the program needs to know when the string ends. so it's actually "solo\0"

It's just a guess. I would also like to read an actual explanation for this.

edit: thanks vukan ^^

Answer 4

Yeah vukan is right

Answer 5

No actually you’re not. That’s an error. Sizeof shouldn’t do that.

Answer 6

solo\0
5
strlen just count the characters