[Dev-C++] why doesn't my program work...

[chromatonus 7. <chr...@ho...>]

//hi, this is my program, there's no error, just that it's supposed to
//calculate the mean and standard deviation of a list of data. after I input
//my list the program exits without showing either of the two values.
//If anyone can help, it will be much appreciated : )


//Mean and Standard Deviation
//9-20-01

#include <iostream.h>
#include <conio.h>
#include <math.h>
#include <stdlib.h>

//Prototypes
int enter( int dat[] );
float average( int dat[], int n );
float stndrdv( int dat[], int n, float ave );
void display( int size, float ave, float sd );


int main()
  {
   int size;
   int dat[100];
   float ave;
   float sd;

   size = enter( dat );
   ave = average( dat, size );
   sd = stndrdv( dat, size, ave );
  }


int enter( int dat[] )
  {
   int k; //counter for how many values entered
   int x; //individual values entered
   int size;

   k = 0;
   cout<< "Statistic evaluator" << "\n";
   cout<< "The first datum on the list= ";
   cin>> x;
   while( x != 0 )
     {
      dat[k] = x;
      k++;
      cout<< "and the rest of the list goes                                  
  ";
      cin>> x;
     }
   return(k);
  }


float average( int dat[], int k )
  {
   int j;    //loop counter
   int sum;  //sum of the y vals
   float ave;

   sum = 0;
   for( j=0; j<k; j++ )
     sum = sum + dat[j];
   ave = (float)(sum/k);
   return( ave );
  }


float stndrdv( int dat[], int k, float ave )
  {
   int i;    //loop counter
   float p;  //variance*size: the sum
   float sd;

   p = 0;
   for( i=0; i<k; i++ )
     p = ( dat[i] - ave )*( dat[i] - ave ) + p;
   sd = (float)(sqrt( p/(k-1) ));
   return( sd );
  }


void display( int size, float ave, float sd )
  {
   cout<< "size=" << size << "\n";
   cout<< "mean=" << ave << "\n";
   cout<< "s.d.=" << sd << "\n";
   system("PAUSE");
  }




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