Это – решение задачи, условие которой мы опубликовали в предыдущем материале. Сохранен тот вариант, который предложен авторами-составителями; мне кажется, что в рамках тех дополнений, которые, скорее всего, будут введены в рамках нашей школьной программы, решение (как, впрочем, и условие), можно и даже следует немного изменить – в первую очередь в отношении ввода и вывода данных и результатов. Ну а пока, как сказано, перед вами вариант составителей.

 

// Class Living - research on standard of living in big cities

 

 public class Living {

 

    private int [] [] standards  =

         {{ 65, 70, 75,80 },

           { 80, 85, 78, 76 },

           { 89, 93, 95, 92 },

           { 60, 65, 59, 61 },

           { 76, 82, 84, 80 },

           { 62, 65, 72, 74 },

           { 83, 80, 85, 82 }};

 

    private String [] contin =

     { "Europe", "N. America", "Australia", "Africa", "N. America", "Africa", "Australia"};

    

    private double [] living;

   

    private int [] numbers;

    

     public Living()

     {

         living = new double [standards.length ];

         numbers =  new int [standards.length ];

     }

 

// compute the standard of living

     private void compute_living ()

     { 

         for ( int i=0;i < standards.length; i++)

             living [i] = 0;

         for ( int i=0; i < standards.length; i++)

         {

             for ( int j=0; j < 4;j++)

                 living [i] = living [i] + standards [i][j] ;

             living [i] = living [i] /4.0;

               }

        

     }

    

  // compute the percent of cities in a given continent

  // with a very high standard of living

     public double very_high (String s)

     {

        int n_cont = 0;

        int n_high = 0;

        compute_living();

        for ( int i=0; i< living.length; i++)

        {

            if (contin[i].equals (s) )

            {

                n_cont ++;

                if ( living[i] > 85)

                    n_high ++;

            }

        }

       

      if (n_cont == 0)

          return -1;

      else

         return 100.0/ n_cont * n_high;

   }           

    

// compute the percent of cities in a given continent

// with a very low standard of living

     public double very_low (String s)

     {

        int n_cont = 0;

        int n_low = 0;

        compute_living();

        for ( int i=0; i< living.length; i++)

        {

            if (contin[i].equals (s) )

            {

                n_cont ++;

                if ( living[i] <= 65)

                    n_low ++;

            }

        }

       

        if (n_cont == 0)

          return -1;

      else

        return 100.0/ n_cont * n_low;

   }           

    

// compute the percent of cities in a given continent

// with a standard of living higher than the value in the parameter

     public double higher (String s, int value)

     {

        int n_cont = 0;

        int n_high = 0;

        compute_living();

        for ( int i=0; i< living.length; i++)

        {

            if (contin[i].equals (s) )

            {

                n_cont ++;

                if ( living[i] > value )

                    n_high ++;

            }

        }

        if (n_cont == 0)

          return -1;

      else

        return 100.0/ n_cont * n_high;

   }           

    

   // list the id numbers of cities  in  which the level of safety is lower than

   // the other levels

      public int  safety ()

     {

        int n = 0;

       for ( int i=0; i < standards.length; i++)

         {

             if ( standards [i][0] <  standards [i] [1] && standards [i][0] < standards [i] [2]

                     && standards [i] [0] < standards [i] [3] )

             {

                 numbers [n] = i;

                 n ++;

             }

         }

       

       for ( int i=0; i

            System.out.println (numbers[i]);

       return n;

       

      }

    

  // list the id numbers of cities in which the level of education  is higher than

   // the other levels

      public int educ ()

     {

        int n = 0;

       for ( int i=0; i < standards.length; i++)

         {

             if ( standards [i][2] >  standards [i] [0] && standards [i][2] > standards [i] [1]

                     && standards [i] [2] > standards [i] [3] )

             {

                 numbers [n] = i;

                 n ++;

             }

         }

       

        for ( int i=0; i

            System.out.println (numbers[i]);

       return n; 

 

      }  

        

    // list the id numbers of cities in which the level of education  is very close

   // to the level of safety

      public int educ_safety ()

     {

        int n = 0;

       for ( int i=0; i < standards.length; i++)

         {

             if ( Math.abs (standards [i][0] -  standards [i] [2] ) < 5 )

               {

                 numbers [n] = i;

                 n ++;

             }

         }

       

     for ( int i=0; i

            System.out.println (numbers[i]);

       return n;

 

      }      

    

 }