- case EXPR_UNARY_NEGATE: print_string("-"); break;
- case EXPR_UNARY_PLUS: print_string("+"); break;
- case EXPR_UNARY_NOT: print_string("!"); break;
- case EXPR_UNARY_BITWISE_NEGATE: print_string("~"); break;
+ case EXPR_UNARY_NEGATE: print_char ('-' ); break;
+ case EXPR_UNARY_PLUS: print_char ('+' ); break;
+ case EXPR_UNARY_NOT: print_char ('!' ); break;
+ case EXPR_UNARY_BITWISE_NEGATE: print_char ('~' ); break;