三个数排序

/**
  最经典的C语言算法!
*/
public class 第十五题三个数排序 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("请输入三个整数： ");
        int a = in.nextInt();
        int b = in.nextInt();
        int c = in.nextInt();
        int temp = 0;
        //首先如果 a > b，那么把a和b的值互换，变成了 a < b
        if(a > b) {
            temp = a;
            a = b;
            b = temp;    
        }
        //其次如果a > c,那么把a和c的值互换，变成了a < c
        if(a > c) {
            temp = a;
            a = c;
            c = temp;    
        }
        //最后如果b > c,那么把b和c的值互换，变成了b < c，此时就能确定a < b < c，排序完成
        if(b > c) {
            temp = b;
            b = c;
            c = temp;
        }
        System.out.println("按照升序排序：" + a + " " + b + " " + c);
//        System.out.println("按照降序排序：" + c + " " + b + " " + a);
        in.close();
    }
}