WXME0106 ## wxtextwxtabwxmediawximage$(lib "comment-snip.ss" "framework")+(lib "collapsed-snipclass.ss" "framework")drscheme:sexp-snipdrscheme:syntax-snipclass%drscheme:number,(lib "number-snip.ss" "drscheme" "private")drscheme:bindings-snipclass%drscheme:lambda-snip%drscheme:define-snip%java-comment-box%java-interactions-box%"drscheme:vertical-separator-snip%wxbaddrscheme:xml-snip(lib "xml-snipclass.ss" "xml")drscheme:scheme-snip"(lib "scheme-snipclass.ss" "xml")test-case-box%wxloc€½K ZÁÿZÁÿÁÿ€ÿ€ÿ€ÿÁÿ StandardK-adobe-courier ZÁÿZÁÿÁÿ€ÿ€ÿ€ÿÁÿÁÿ?ð\ÁÿÁÿÁÿÁÿÁÿ?ð?ð?ð"€‹"ÁÿÁÿMatching Parenthesis 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this list   abstract int count();    // compute the sum of all items in this list   abstract int sum();    // count the number of items in this list, using an accumulator   // the initial value of the accumulator should be zero   abstract int accuCount(int aCount);    // compute the sum of all items inthis llist, using an accumulator   // the initial value of the accumulator should be zero   abstract int accuSum(int aSum);    // compute the average of the numbers in this list   int avg() {     return this.sum() / this.count();   }    // compute the average of the numbers in this list, using two accumulators   // one accumulator for the count, and one for the sum of all numbers seen   // initial values for both accumulators are zero   abstract int accuAvg(int aCount, int aSum);  }   class OneLon extends ALon{    OneLon(int n){     this.num = n;   }  YTemplate: ...this.num... ...this.count()... ...this.sum()...  ...this.accuCount(int aCount)... ...this.accuSum(int aSum)... ...this.avg()... '...this.accuAvg(intaCount, int aSum)...    int count(){     return 1;   }    int sum(){     return num;   }    // aCount is the total count of items encountered so far - add one to that count   int accuCount(int aCount){     return 1 + aCount;   }    // aSum is the total sum of items encountered so far - add this num to that sum   int accuSum(int aSum){     return this.num + aSum;   }    // aCount is the total count of items encountered so far - add one to that count   // aSum is the total sum of items encountered so far - add this num to that sum   int accuAvg(int aCount, int aSum){     return (this.num + aSum) / (1 + aCount);   } }  class ConsLon extends ALon {   ALon rst;    ConsLon(int n, ALon lst){     this.num = n;     this.rst = lst;   }  »>Template: ...this.num... ...this.rst... ...this.count()... ...this.rst.count()... ...this.sum()... ...this.rst.sum()...  ...this.accuCount(int aCount)... $...this.rst.accuCount(int aCount)... ...this.accuSum(int aSum)...  ...this.rst.accuSum(int aSum)... ...this.avg()... ...this.rst.avg()... '...this.accuAvg(intaCount, int aSum)... +...this.rst.accuAvg(intaCount, int aSum)...    int count(){     return 1 + this.rst.count();   }    int sum() {     return this.num + this.rst.sum();   }    // aCount is the total count of items encountered so far:   // recur, with accumulator value one larger thatn the previous count   int accuCount(int aCount){     return this.rst.accuCount(1 + aCount);   }    // aSum is the total sum of items encountered so far   // recur with accumulator value computed by adding this num to the previous sum   int accuSum(int aSum){     return this.rst.accuSum(this.num + aSum);   }    // aCount is the total count of items encountered so far - add one to that count   // aSum is the total sum of items encountered so far - add this num to that sum   // recur with the two new accumulator values   int accuAvg(int aCount, int aSum){     return this.rst.accuAvg(1 + aCount, this.num + aSum);   }  }  Q ALon l1 = new OneLon(3); £ ALon l2 = new ConsLon(4, new ConsLon(5, new OneLon(6))); `  ALon l3 = new ConsLon(3, l1);  M8"Testing the method count in classes OneLon and ConsLon"  8l1.count() == 1 8l2.count() == 3 8l3.count() == 2  K6"Testing the method sum in classes OneLon and ConsLon"  6l1.sum() == 3 7l2.sum() == 15 6l3.sum() == 6   Q<"Testing the method accuCount in classes OneLon and ConsLon"  Gl1. accuCount(0) == 1 Gl2. accuCount(0) == 3 Gl3. accuCount(0) == 2  Y"Testing the method accuSum in classes OneLon and ConsLon"  El1.accuSum(0) == 3 Fl2.accuSum(0) == 15 El3.accuSum(0) == 6  K6"Testing the method avg in classes OneLon and ConsLon"  6l1.avg() == 3 6l2.avg() == 5 6l3.avg() == 3  Y"Testing the method accuAvg in classes OneLon and ConsLon"  R l1.accuAvg(0, 0) == 3 R l2.accuAvg(0, 0) == 5 R l3.accuAvg(0, 0) == 3