Thread: fmod problem

How to use fmod inside a if function?

Code:

double List ()
{
  double Div = N;

  while (--Div > 0){

    if((N % Div) == 0 )
    printf("%.lf +", Div);
   }
}

Originally posted by yusiye
How to use fmod inside a if function?

Code:

double List ()
{
  double Div = N;

  while (--Div > 0){

    if((N % Div) == 0 )
    printf("%.lf +", Div);
   }
}

I changed to

Code:

double List ()
{
  double Div = N;
  d = fmod(Div, N);
  while (--Div > 0){

    if( d == 0 )

    printf("%.lf +", Div);

   }
}

But I got overflow, please help

fmod returns the remainder of a divisor and dividend presented by the code. It is a very useful tool, but you need to remember that floats and doubles are not always exact, so you might not get the desired result.

The code you have presented

Code:

 double List ()
{
  double Div = N;

  while (--Div > 0){

    if((N % Div) == 0 )
    printf("%.lf +", Div);
   }
}

appears to attempt to use modulo vice fmod. You could either use fmod:

Code:

 if((fmod(N,Div))==0)

or cast your doubles into ints and use modulo:

Code:

if(((int)N % (int)Div)) == 0)

Your choice.

What's it supposed to do?