sum_while.java

Java Classic Examples是我买的两本书：《JAVA经典实例》和《java入门经典源代码》里边附送光盘里带的源码

//用while语句实现求1到10之和.

class Sum_while
{
    public static void main(String args[])
    {
        int i=1,n=10,s=0;
        while (i<=n)
        {
            s = s + i;
            i++;
        }
        System.out.println("Sum = 1+...+"+n+" = "+s);
        i=1;
        s=0;
        while (i>=n)			//循环体一次也不执行
            s += i++;
        System.out.println("Sum = 1+...+"+n+" = "+s);
        
        
    }  //main
}  //class

/*
Sum = 1+...+10 = 55
Sum = 1+...+10 = 0
     
int i=1,n=10,s=0;
while (i<=n)				// 死循环
    s = s + i;
*/