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

[Ivan F. <fr...@gc...>]

You forgot to call display in main.

--Ivan Frohne
----- Original Message -----
From: "chromatonus 712" <chr...@ho...>
To: <dev...@li...>
Sent: Sunday, September 30, 2001 13:57
Subject: [Dev-C++] why doesn't my program work...


> //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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