Thread: Solution for truncation after 17th Digit?

I was trying to write a simple program on C about the classical history between the king, chessboard and rice grains. The total amount of rice grains that is needed to fill the chessboard is : 18 446 744 073 709 551 615 .
But i'm getting : 18 446 744 073 709 552 000. on C.
Aren't there any solution to increase 17 digits resolution? I saw some solutions which were very long and complicated where a newbie like me couldnt understand anything.
Here is my code:

Code:

#include<stdio.h>
#include<math.h>

int main(void)
{
  double i=1.0;
  while(i<=64)  
  {
    printf("%2.0lf.Casilla = %.0lf\n", i, pow(2.0,(i-1.0)));
    i++;
  }
  printf("\n\n***En Total = %.0lf Granos.\n\n",pow(2.0,64.0)-1);
  return0;
}

Originally Posted by gemera

C99 introduced an 'unsigned long long integer' type.

It has a max value (ULLONG_MAX in limits.h) of 18 446 744 073 709 551 615.

What data types are returned from the pow() functions?
I was hinting to the OP to do the work, rather than give the answer.

Fair dues. I wasn't addressing your post though. Just making the OP aware there is a type available for the problem. If the OP has covered functions a solution is not that difficult.