What is the output of this code? cout<< 1+"hello"???

Question

Can somebody tell me the answer of this!!

Answer 1

That will trigger error being written as it is. Missing semicolon, and the 3 question marks definitely will fail the code.

However, having the code with no question marks and a semicolon, is valid (as follows).

std::cout << 1 + "hello";

String literal such as the "hello" here, is a constant char pointer. Because it is a pointer, we can do pointer arithmetic on it, like the line above, will output 'ello' on screen. Hopefully this figure can help to illustrate.

pointer + 0 1 2 3 4
h e l l o

When you do:
1 + "hello", output => 'ello'
2 + "hello", output => 'llo'
3 + "hello", output => 'lo'
4 + "hello", output => 'o'

Valid index usable for something like this is between zero (first character) and string length - 1 (last character).

Hth, cmiiw

Answer 2

Hi. You could try it in code playground. I think it will raise an error.