sum_for2.java

JAVA用函数实现四则运算

public class Sum_for2
{
    public static void main(String args[])
    {
        int i=1,n=10,s=0;
        for (i=1;i<=1;i++)
            s = s + i;
        System.out.println("Sum = 1+...+"+n+" = "+s);
        s = 0;
        System.out.print("Sum = ");
        for (i=n;i>1;i--)
        {
            s  += i;
            System.out.print(i+"+");
        }
        System.out.println(i+" = "+(s+i));
    }
}