分段函数switch的应用

#include <iostream>#include<cmath>using namespace std;int main(){    double x,y;    int t;    cout<<"请输入x的值：";    cin>>x;    t=(x<2)+(x<6)+(x<10);    switch(t)    {        case 3:y=x;break;        case 2:y=x*x+1;break;        case 1:y=sqrt(x+1);break;        case 0:y=1.0/(x+1);break;    }    cout<<"得到y的值为："<<y<<endl;    return 0;}