A casting problem?

[uderman]

Hello there,

I am having some strange results when trying to compute a simple math calculation. Can anyone please have a look at this code?

	for (i=N_DISPLAY-1 ; i>=0 ; i--)
	{
		digitos[i] = v_digito/(int)pow(10, (double)i);
		
		v_digito = v_digito - digitos[i]*(int)pow(10, (double)i);
	}

digitos[], i and v_digito are int types. pow is:

double pow (double a, double b);

What I am trying to do is to extract each of the algarisms of a number.

Debuging I found out the firs expression seens to be Ok, but the second simple ads 1 or 2 to the desired number to be stored at v_digito.

I suspect it is a casting problem as when I "play" with then I get diferent results, but none good..

Can anyone help? Thank you!

[nacho4d]

        int N_DISPLAY = 4;
	int digitos[4];
	int v_digito = 7653;
	int i;
	
	for (i=N_DISPLAY-1 ; i>=0 ; i--)
    {
		digitos[i] = v_digito/(int)pow(10.0, (double)i);
		printf("%ld\n", digitos[i]);
		
		v_digito = v_digito - digitos[i]*(int)pow(10, (double)i);
		printf("%ld\n",v_digito);
    }

This is what I run and the answer seems to be fine...
Could you explain further what is the problem?

My answer:
7
653
6
53
5
3
3
0

also tried the following variations and everything seems ok.

digitos[i] = (int) ((double)v_digito/pow(10.0, (double)i));
v_digito = v_digito - digitos[i]*pow(10, (double)i);

;

In the second expression, there is no necessity of casting.

Regards

[uderman]

In the second expression, there is no necessity of casting.

Regards

Hello there, I removed this casting and it is working now!

Thank you!