判断:两个数x、y的正负性。
要求:不可以使用比较运算符,即"<",">","<=",">=","==","!="。
有多组数据,每组数据占一行,每一行两个数x,y。
x、y保证在int范围内。
输出
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
#include<stdio.h>
int main() {
int x,y;
while(scanf("%d %d",&x,&y) == 2) {
if(x*y>0)
printf("Signs are not opposot\n");
else if(x*y<0)
printf("Signs are opposite\n");
else printf("Signs can't be sure\n");
}
return 0;
}