#include <stdio.h>
#include <stdlib.h>

int main(void) {

  double a[] = {1.0, 2.0, 3.0, 4.0, 5.0},
         sum = 0.0;
  int i;

  a[1] = 2.2;

  for (i = 0; i < 5; i++)
    sum += a[i];
  printf("Sum = %f\n", sum);   /* 15.2 */

  return 0;
}