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;  Licensed to the Apache Software Foundation (ASF) under one
;  or more contributor license agreements.  See the NOTICE file
;  distributed with this work for additional information
;  regarding copyright ownership.  The ASF licenses this file
;  to you under the Apache License, Version 2.0 (the
;  "License"); you may not use this file except in compliance
;  with the License.  You may obtain a copy of the License at
;  
;    http://www.apache.org/licenses/LICENSE-2.0
;    
;  Unless required by applicable law or agreed to in writing,
;  software distributed under the License is distributed on an
;  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
;  KIND, either express or implied.  See the License for the
;  specific language governing permissions and limitations
;  under the License.

; Currency converter implementation

(define (convert from to amount)
  (if (equal? to "EUR") (* amount 0.70) amount)
)

(define (symbol currency) 
  (if (equal? currency "EUR") "E" "$")
)