int will work, but double/float wont?

I've been working on an assignment, and it didnt take very long, but there is one slight error thats getting me completely frustrated...I want to use a double or float for 2 of the variables, so that it doesnt truncate when it calculates the average and standard deviation of a set of numbers, but average always comes out as 0 when its a double/float, and will come out just fine when its an int (except for the truncation)....does anyone see anything wrong with my code, and any help would be appreciated

Project Folder

Post a snippet of code here, I for one have no way of opening a rar file on my current PC.

header file

Code:

public:
	int m_Sum;
	int m_Size;
	void StdDev (void);
	void Display (CDC* pDC, int ww, int wh, int DispControl);
	void Initialize (void);
	double m_Std;
	double m_Average;
	int m_Minimum;
	int m_Maximum;
	int  m_Array[1000];

cpp file
[code]
void C1DArray::Initialize()
{
m_Sum = 0;

srand(time(NULL));

int tmax = 0, tmin = 32768;

for (int i = 0; i < m_Size; i++)
{
m_Array[i] = rand();

if (m_Array[i] > tmax)
{
m_Maximum = m_Array[i];
tmax = m_Maximum;
}

if (m_Array[i] < tmin)
{
m_Minimum = m_Array[i];
tmin = m_Minimum;
}

m_Sum += m_Array[i];
}

m_Average = m_Sum / m_Size;

}

the output

Code:

case 4:		{
				x = (ww - (15*7)) / 2;
				y = (wh) / 2;
				sprintf(buffer, "Average = %d", m_Average);
				pDC -> TextOut (x, y, buffer);
				break;
				}

if i output sum, its fine, if i output m_size, its fine....however, when i outputaverage its 0 when double, and perfect when int (except for the truncation which isnt exceptable )

>>m_Average = m_Sum / m_Size;
Both m_Sum and m_Size are ints so, you need to cast them to make the divide keep the precision.

>>sprintf(buffer, "Average = %d", m_Average);
Try using %f instead of %d

If you can't get it going, try breaking it down to a small program like this:

Code:

#include <stdio.h>

int main(void)
{
  int i1 = 10, i2 = 3;
  double f = (double)i1 / i2 ;
  
  printf ("%f\n", f);
  
  return 0;
}

type casting didnt seem to work....it did the same thing if i would orginally declare sum as a double....any other suggestions?

edit, the %f in the printf statement did the trick...however, one last problem (ive never used printf before this, so im not sure how formatting is), but the output comes out with a precision of 6 decimal points...how can i have it so it only shows 2 or 3?

again, thank you so much

>>> have it so it only shows 2 or 3?

%.nf where n is the desired precision, eg. %.2f for two places.

thank you very much