Returns the character corresponding to the code specified by I, using the system's native character set.
Note that no intrinsic exists to convert a numerical value to a printable character string. For example, there is no intrinsic that, given an INTEGER or REAL argument with the value `154', returns the CHARACTER result `'154''.
See section 8.11.9.137 IChar Intrinsic, for the inverse of the CHAR function.
See section 8.11.9.4 AChar Intrinsic, for the function corresponding to the ASCII character set.