Add an object to a string : +

### 2.4.9 Add an object to a string : `+`

`+` is an infixed operator (resp `’+’` is a prefixed operator.
If `+` (resp `’+’`) takes as argument a string (resp. a sequence of objects with a string as first or second argument), the result is the concatenation of these objects into a string.
warning
`+` is infixed and `’+’` is prefixed.
Input :

`’+’("abcd",3,"d")`

Ou on tape :

`"abcd"+3+"d"`

Output :

`"abcd3d"`

Input :

`c:=5`

Then input:

`"abcd"+c+"e"`

Or input:

`’+’("abcd",c,"d")`

Output :

`"abcd5e"`