/* This is not a complete program. */

/***** summarray: Sums specified elements of a float array *****
On entry: A is the array whose elements are to be summed,
          L specifies the first element of the array to include in the sum,
          H specifies the last element to include.
On exit:  Returns the sum of array elements A[L] to A[H].
*/

float sumarray(float A[], int L, int H) {
    if (H < L) {                        /* nothing to sum */
        return 0;                           /* answer 0 */
    } else if (H == L) {                /* one element in range */
        return A[L];                        /* answer is that element */
    } else {                            /* Multiple elements */
        int M;                              /* answer is the sum of */
        M = (L+H)/2;                        /* the two halves */
        return sumarray(A, L, M) + sumarray(A, M + 1, H);
    }
}