Thread: [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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Sorry, Dude!
This looks like real beginner's stuff.  You just forgot to call your =
void display().  I changed it for you.
Hopefully these are your very first steps.  If it's not, I strongly =
suggest you finding a programming partner, so you shouldn't have needed =
to put a question to a mailinglist about one missing line (that does all =
the things that were missing for your program to run as you expected =
...).
fullfilled with hope,
St0fF.

----- Original Message -----=20
From: "chromatonus 712" <chr...@ho...>
To: <dev...@li...>
Sent: Sunday, September 30, 2001 11:57 PM
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 : )
|=20
|=20
| //Mean and Standard Deviation
| //9-20-01
|=20
| #include <iostream.h>
| #include <conio.h>
| #include <math.h>
| #include <stdlib.h>
|=20
| //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 );
|=20
|=20
| int main()
|   {
|    int size;
|    int dat[100];
|    float ave;
|    float sd;
|=20
|    size =3D enter( dat );
|    ave =3D average( dat, size );
|    sd =3D stndrdv( dat, size, ave );
    display(size,ave,sd);
|   }
|=20
|=20
| int enter( int dat[] )
|   {
|    int k; //counter for how many values entered
|    int x; //individual values entered
|    int size;
|=20
|    k =3D 0;
|    cout<< "Statistic evaluator" << "\n";
|    cout<< "The first datum on the list=3D ";
|    cin>> x;
|    while( x !=3D 0 )
|      {
|       dat[k] =3D x;
|       k++;
|       cout<< "and the rest of the list goes                            =
     =20
|   ";
|       cin>> x;
|      }
|    return(k);
|   }
|=20
|=20
| float average( int dat[], int k )
|   {
|    int j;    //loop counter
|    int sum;  //sum of the y vals
|    float ave;
|=20
|    sum =3D 0;
|    for( j=3D0; j<k; j++ )
|      sum =3D sum + dat[j];
|    ave =3D (float)(sum/k);
|    return( ave );
|   }
|=20
|=20
| float stndrdv( int dat[], int k, float ave )
|   {
|    int i;    //loop counter
|    float p;  //variance*size: the sum
|    float sd;
|=20
|    p =3D 0;
|    for( i=3D0; i<k; i++ )
|      p =3D ( dat[i] - ave )*( dat[i] - ave ) + p;
|    sd =3D (float)(sqrt( p/(k-1) ));
|    return( sd );
|   }
|=20
|=20
| void display( int size, float ave, float sd )
|   {
|    cout<< "size=3D" << size << "\n";
|    cout<< "mean=3D" << ave << "\n";
|    cout<< "s.d.=3D" << sd << "\n";
|    system("PAUSE");
|   }
|=20
|=20
|=20
|=20
| _________________________________________________________________
| Get your FREE download of MSN Explorer at =
http://explorer.msn.com/intl.asp
|=20
|=20
| _______________________________________________
| Dev-cpp-users mailing list
| Dev...@li...
| https://lists.sourceforge.net/lists/listinfo/dev-cpp-users

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");
>   }
>
>
>
>
> _________________________________________________________________
> Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
>
>
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>