ex4_39.c

acm大赛题

// Ex 4.39 in page 196

#include <stdio.h>

#define K 100

int fac(int n) {
   if (n == 1)
      return 1;
   else
		return n * fac( n-1);
}

int main(void) {
   double sum;
   int i;

   sum = 1.0;
   for (i = 1; i <= K; i++) {
      sum += 1.0 / fac(i);
   }

	printf("e = %lf", sum);

   return 0;
}