Print INFINITY values to something else in JAVA

Question

I am having calculation in my java coding, my problem now is whenever i hit 0 divide by 0, it prints the value ?. My question is, can i change the ? to print 0 or something else? Is that possible? Below is my code,

DecimalFormat df = new DecimalFormat ("0.00");
if (rowset[9] == null) {rowset[9]="0";out.print("0.00");} 
else out.print(df.format(Double.valueOf(rowset[9])/Double.valueOf(rowset[10])));

You're probably printing NAN ("Not A Number"). 0/0 is not 0, so you shouldn't print that. What else would you like to print? How about "NAN"? — markspace, Apr 28 '20 at 03:55
@markspace yeah i guess it is NAN behind the "?" that is currently printing now, Yeah, i can print anything, other than the `?` i am getting now — justarandomguy, Apr 28 '20 at 03:57

score 1 · Accepted Answer · answered Apr 28 '20 at 04:01

Maybe something like (not tested):

DecimalFormat df = new DecimalFormat ("0.00");
if (rowset[9] == null) {rowset[9]="0";out.print("0.00");} 
else {
  double result = rowset[9] / rowset[10];
  if( result != result )
     System.out.println( "undefined" );
  else
     out.print( df.format( result ) );
}

After writing this, I did a search and found a better way to test for NAN. I guess I should RTFM. How do you test to see if a double is equal to NaN?

Thanks mate, this solved my problem! I guess i should read the manual also. — justarandomguy, Apr 28 '20 at 06:26

Print INFINITY values to something else in JAVA

1 Answers1