Write a complete Java program that uses a loop that computes the expression
m + m+1 + m+2 + ......... n-2 + n-1 + n. m and n are to be integers input
from the user and should be checked for validity against the conditions
1 <= m <= n.
(2) Run the code for at least five good test cases, recording the values of m,
n, and the result. For each case, develop an algebraic expression, showing
your derivation, that should give the same answer and compute the result via
calculator.
I NEED HELP WITH THIS I DONT KNOW WHAT I AM DOING WRONG!!
public class TheSum {
public static void main(String[] args) {
int n = 600;
int m = 100;
if (n < 1 || m < 1 || n < m)
throw new IllegalArgumentException();
int sum = 0;
for (int i = m; i <= n; i++)
sum += i;
System.out.println(sum);
// Or simply use:
System.out.println(n * (n + 1) / 2 - m * (m - 1) / 2);
}
}