题解 | #交换变量值#
交换变量值
http://www.nowcoder.com/practice/bd243c9bef70492f91959cc5556546a8
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int a = scanner.nextInt();
int b = scanner.nextInt();
//write your code here.......
a=a+b;
b=a-b;
a=a-b;
System.out.println(a+" "+b);
}
}
我们先让a=1,b=2,因为代码是自上而下运行,且我们不能引入第三个变量,所以要从ab两个变量下手,先让a=a+b的和即为3,此时交换数值,b还是等于2,b要等于1,b=a-b,此时b=1,a要等于2,此时a=3,所以a=a-b
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