### 2.4.1 Character and string : `"`

`"` is used to delimit a string. A character is a string of length one.
Do not confuse `"` with `’` (or `quote`) which is used to avoid evaluation of an expression . For example, `"a"` returns a string of one character but `’a’` or `quote(a)` returns the variable `a` unevaluated.
When a string is input in a command line, it is evaluated to itself hence the output is the same string. Use `+` to concatenate two strings or a string and another object.
Example :
Input :

`"Hello"`

`"Hello"` is the input and also the output.
Input :

`"Hello"+", how are you?"`

Output :

`"Hello, how are you?"`

The index notation is used to get the n-th character of a string, (as for lists). Indices begin at 0 in Xcas mode, 1 in other modes.
Example :
Input :

`"Hello"[1]`

Output :

`"e"`