Answer to Question #285352 in Java | JSP | JSF for Hasty

Question

Write a Program to display sum of the following series:

1-3+5-7+9.....n terms

Using following method prototype:

int  series(int n)

Answer 1

int  series(int n) {

if (n % 2 == 0) return series(n - 1);

    if (n < 0) return 0;

    if (n == 1) return 1;

    else if ((n + 1) % 4 == 0) return series(n - 2) - n;

    else return series(n - 2) + n;

}