/*
 * Copyright (C) 2007-2020 Artima, Inc. All rights reserved.
 *
 * Licensed 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.
 *
 * Automatically generated Scala interpreter transcript from:
 *
 * Programming in Scala (Fifth Edition)
 * by Martin Odersky, Lex Spoon, Bill Venners, and Frank Sommers
 *
 * http://booksites.artima.com/programming_in_scala_5ed
 */


scala>   class Rational(n: Int, d: Int):
           println("Created " + n + "/" + d)

                                       ^
       error: ';' expected but ':' found.

scala> new Rational(1, 2)
           ^
       error: not found: type Rational

scala> Rational(1, 2)
       ^
       error: not found: value Rational

scala>   class Rational(n: Int, d: Int):
           override def toString = s"$n/$d"

                                       ^
       error: ';' expected but ':' found.

scala> val x = Rational(1, 3)
               ^
       error: not found: value Rational

scala> val y = Rational(5, 7)
               ^
       error: not found: value Rational

scala> Rational(5, 0) // 5/0
       ^
       error: not found: value Rational

scala>   class Rational(n: Int, d: Int):
           require(d != 0)
           val numer: Int = n
           val denom: Int = d
           override def toString = s"$numer/$denom"
           def add(that: Rational): Rational =
             Rational(
               numer * that.denom + that.numer * denom,
               denom * that.denom
             )

                                       ^
       error: ';' expected but ':' found.

scala>   class Rational(n: Int, d: Int):
       
           require(d != 0)
       
           private val g = gcd(n.abs, d.abs)
           val numer = n / g
           val denom = d / g
       
           def this(n: Int) = this(n, 1)
       
           def add(that: Rational): Rational =
             Rational(
               numer * that.denom + that.numer * denom,
               denom * that.denom
             )
       
           override def toString = s"$numer/$denom"
       
           private def gcd(a: Int, b: Int): Int = 
             if b == 0 then a else gcd(b, a % b)

                                       ^
       error: ';' expected but ':' found.
                    if b == 0 then a else gcd(b, a % b)
                       ^
On line 20: error: '(' expected but identifier found.
                    if b == 0 then a else gcd(b, a % b)
                              ^
On line 20: warning: then is a reserved word (since 2.10.0); usage as an identifier is deprecated

scala>   class Rational(n: Int, d: Int):
       
           require(d != 0)
       
           private val g = gcd(n.abs, d.abs)
           val numer = n / g
           val denom = d / g
       
           def this(n: Int) = this(n, 1)
       
           def + (that: Rational): Rational =
             Rational(
               numer * that.denom + that.numer * denom,
               denom * that.denom
             )
       
           def * (that: Rational): Rational =
             Rational(numer * that.numer, denom * that.denom)
       
           override def toString = s"$numer/$denom"
       
           private def gcd(a: Int, b: Int): Int = 
             if b == 0 then a else gcd(b, a % b)

                                       ^
       error: ';' expected but ':' found.
                    if b == 0 then a else gcd(b, a % b)
                       ^
On line 23: error: '(' expected but identifier found.
                    if b == 0 then a else gcd(b, a % b)
                              ^
On line 23: warning: then is a reserved word (since 2.10.0); usage as an identifier is deprecated

scala>   class Rational(n: Int, d: Int):
       

            require(d != 0)
       
           private val g = gcd(n.abs, d.abs)
           val numer = n / g
           val denom = d / g
       
           def this(n: Int) = this(n, 1)
       
           def + (that: Rational): Rational =
             Rational(
               numer * that.denom + that.numer * denom,
               denom * that.denom
             )
       
           def + (i: Int): Rational =
             Rational(numer + i * denom, denom)
       
           def - (that: Rational): Rational =
             Rational(
               numer * that.denom - that.numer * denom,
               denom * that.denom
             )
       
           def - (i: Int): Rational =
             Rational(numer - i * denom, denom)
       
           def * (that: Rational): Rational =
             Rational(numer * that.numer, denom * that.denom)
       
           def * (i: Int): Rational =
             Rational(numer * i, denom)
       
           def / (that: Rational): Rational =
             Rational(numer * that.denom, denom * that.numer)
       
           def / (i: Int): Rational =
             Rational(numer, denom * i)
       
           override def toString = s"$numer/$denom"
       
           private def gcd(a: Int, b: Int): Int = 
             if b == 0 then a else gcd(b, a % b)

       }
                                       ^
       error: ';' expected but ':' found.
                    if b == 0 then a else gcd(b, a % b)
                       ^
On line 45: error: '(' expected but identifier found.
                    if b == 0 then a else gcd(b, a % b)
                              ^
On line 45: warning: then is a reserved word (since 2.10.0); usage as an identifier is deprecated
       }
       ^
On line 47: error: illegal start of simple expression

scala> 2 * r
           ^
       error: not found: value r