castError.c:7 error: Can't choose between 3 alternatives for expression Cast of: Name: f to: char Alternatives are: Cost ( 1, 0, 0 ): Cast of: Variable Expression: f: function accepting unspecified arguments returning nothing to: char (types: char ) Environment: Cost ( 1, 0, 0 ): Cast of: Variable Expression: f: signed int to: char (types: char ) Environment: Cost ( 1, 0, 0 ): Cast of: Variable Expression: f: double to: char (types: char ) Environment: