From the October 18 problem of the Incremental Programming section we are going to solve it using a functional app architecture.  

P0

static etc   / /read and echo two integers   int a = IO.read_int ();   int b = IO.read_int ();   IO.println ( ``a =  '' + a);   IO.println ( ``b =  '' + b);   }

 

P1

static etc   / /same as P0   P0 code   / /compute & print the max value   int max = max (a,  b);   IO.println (max);   }   static private int max (int a,  int b)   {   if (a > b)   {   return a;   }   else   {   return b;   }   }

 

P2

static etc   / /P0 stuff   / /P1 stuff     / /P2 stuff compute min   int min = min (a,  b);   IO.println (min);   }     private int min (int a,  int b)   {   --- code   }

 

P3

static etc   / /P0 stuff   / /P1 stuff   / /P2 stuff   / /P3 stuff compute & display diff   int diff = max - min;   IO.println ( ``diff =  ``+ diff);   }     private int min (int a,  int b)   {   --- code   }   private int max (int a,  int b)   {   -- code   }

 

P4 Final Version
Simply delete all output statements except the final output statement which solves the problem  

Problem
Read several (at least one) non negative integers and compute their real average.  

- >

/ /standard java header stuff goes here   {   / /establish an accumulator   int sum = 0;   / /establish a counter to count data   int count = 0;   / /sum their integers   int num = IO.read_int ();   while (num > = 0)   {   sum = sum + num;   count = count + 1;  / /or count + +   num = IO.read_int ();   }   / /compute & display the average (cast as a double)   double ave = (double) sum / (double) count;   IO.println ( ``ave =  ``+ ave);   }