每组数据输出占一行。 如果两个数是一正一负,输出"Signs are opposite" 如果是同为正或同为负,输出"Signs are not opposot" 如果无法确定,输出"Signs can't be sure" 输出不包括引号
样例输入
1 1 -1 1
样例输出
Signs are not opposot Signs are opposite
import java.util.Scanner; public class Main { public static void main(String[] args){ Scanner input&#61;new Scanner(System.in); while(input.hasNextInt()){ int a&#61;input.nextInt(); int b&#61;input.nextInt(); int c; c&#61;a*b; if(c>0){ System.out.println("Signs are not opposot"); } else if(c<0){ System.out.println("Signs are opposite"); } else{ System.out.println("Signs can&#39;t be sure"); } } } }