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判断:两个数x、y的正负性。
要求:不可以使用比较运算符,即"<",">","<=",">=","==","!="。

1 1 -1 1
Signs are not opposot Signs are opposite
import java.util.Scanner;
public class Main16 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
while (input.hasNext()) {
int a = input.nextInt();
int b = input.nextInt();
if(a*b>0)
System.out.printf("Signs are not opposot \n");
else if(a*b<0)
System.out.printf("Signs are opposite\n");
else
System.out.printf("Signs can‘t be sure\n");
// String str1 = input.next();
// String str2 = input.next();
//
// if ((str1.contains("-") && str2.contains("-")) || (!str1.contains("-") && !str2.contains("-"))) {
// System.out.println("Signs are not opposot");
// } else if ((str1.contains("-") && !str2.contains("-")) || (!str1.contains("-") && str2.contains("-"))) {
// System.out.println("Signs are opposite");
// } else{
// System.out.println("Signs can‘t be sure");
// }
//
}
input.close();
}
}
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原文地址:http://www.cnblogs.com/airycode/p/5485564.html