Thread: functions

Originally posted by Hammer

The next size up variable from an int is a "long int". A float holds numbers with digits after the decimal point.

Thanks. I forgot that

Originally posted by QuestionC
Although the problem seems solved, lemme go ahead and point out why the above code will not work...

Code:

int EVALUATE (int poly[],int num)
{ 
 int i,m,temp,total=0,result=1; 

 for(i=9;i>=0;i--) 
 { 
  temp=poly[i]; 
  for(m=0;m<i;m++) 
   result*=num; 
  total+=(result*temp); 
 } 
  printf ("%d\n", total);
  return total; 
}

This is a nested loop, the outside loop runs through each power of the polynomial, the inner loop handles calculating the power. BUT in order for the inner loop to work, the value of result must be 1 at the beginning of the loop (and it is easy to show that this is not so for any except the first iteration of the outer loop.

Code:

int EVALUATE (int poly[],int num)
{ 
 int i,m,temp,total=0,result=1; 

 for(i=9;i>=0;i--) 
 { 
  temp=poly[i]; 
  result = 1; // <- The change
  for(m=0;m<i;m++) 
   result*=num; 
  total+=(result*temp); 
 } 
  printf ("%d\n", total);
  return total; 
}

That should work, provided the result is within the bounds of an int.

You're right.
I was so happy when it worked twice I just stopped. should have tried a few more times

Thanks.