Implementing a rounding function

[lemonysage]

Hello, I have created a rounding function, and i need help implementing it on a row of data that I have.

 float round_value(float value, int decimal_places)
{
  int magnitude = 1;
  for (int i = 0; i = decimal_places; i++) {
    magnitude = magnitude * 10;
  }
  value = value * magnitude;
  value = int (value + .5);
  value = value / magnitude;
  return value;
}

I want to implement it into this code:

for(row = 0; row < MAX_ROWS; row++)
	{
		rowAverage[row]=0;
		for(col = 0; col < MAX_COLS; col++)
			{
			rowAverage[row]=rowSum[row]/MAX_ROWS;
			
		}
	}

I tried this just after it, but it doesn't work, I thought it would take the value in the row, apply the rounding function then put it back into there.

for(row=0; row < MAX_ROWS;row++)
	{
			rowAverage[row]=round_value(rowAverage[row], DECIMAL_PLACES);
	}

DECIMAL_PLACES = 5

[lemonysage]

Bump

[AbstractionAnon]

So what it doing or not doing?

What you've shown in the third snippet looks like it should work assuming your round_value function is correct and that rowAverage is declared as:
float rowAverage[MAX_ROWS];

You need to show more of your code.

Have you displayed the before and after values to see what you're getting?

[norm b]

Is this a typo? for (int i = 0; i = decimal_places; i++) {

[Duthomhas]

You are trying to do the work of the hardware by using the hardware. Forget the loop.

Also, an ancient article on simple rounding algorithms that I hope to update someday:
http://www.cplusplus.com/forum/articles/3638/

Hope this helps.

[S G H]

Stop spamming.

http://www.cplusplus.com/forum/beginner/110686/
http://www.cplusplus.com/forum/beginner/110693/
and this.

Also learn to edit your post and don't bump every 40 minutes.