结果数据溢出的有关问题

Question

 #include<iostream>
#include<cmath>
using namespace std;

void main()
{
    double x,y,s1,s2;
    cout<<"请输入两个角度值：";
    cin>>x>>y;
    s1=sin(fabs(x)+fabs(y));
    s2=sqrt(cos(fabs(x+y)));
    cout<<s1<<endl<<s2<<endl;
}

Answer 1

#include
#include
using namespace std;
int main()
{
double x,y,s1,s2;
cout<<"请输入两个角度值：";
cin>>x>>y;
s1=sin(fabs(x)+fabs(y));
cout<<cos(fabs(x+y))<<endl;
s2=sqrt(cos(fabs(x+y)));
cout<<s1<<endl<<s2<<endl;
return 0;
}
把这个代码放进去测试得知，cos(fabs(x+y))求出的是一个负数，对负数开方自然就出错了。