題目:編寫一個函數,輸入 n 爲偶數時,調用函數求 1/2+1/4+...+1/n,當輸入 n 爲奇數時,調用函數1/1+1/3+...+1/n。
import java.util.Scanner;
public class WangDao {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.print("Input the number: ");
int n = scan.nextInt();
double sum = 0;
if (n % 2 == 0) {
sum = evenNumber(n);
} else {
sum = oddNumber(n);
}
System.out.println("The sum is " + sum);
}
public static double evenNumber(int n) {
double sum = 0;
for (double i = 2; i <= n; i = i + 2) {
sum += 1 / i;
}
return sum;
}
public static double oddNumber(int n) {
double sum = 0;
for (double i = 1; i <= n; i = i + 2) {
sum += 1 / i;
}
return sum;
}
}