C++实验3

 #include <iostream>#include<cmath>using namespace std;int main(){   int x;   double y;   cout<<"请输入一个整数"<<endl;   cin>>x;   if(x<2)    y=x;     else if(x>=2&&x<6)      y=x*x+1;     else if(x>=6&&x<10)      y=sqrt(x+1);   else        y=1/(x+1);        cout<<"y="<<y<<endl;    return 0;}