C++第二章

2.29：

#include<iostream>using namespace std;int main(){int a[20];int *p[20];a[0]=a[1]=1;int i;   for(i=0;i<20;i++)   a[i+2]=a[i]+a[i+1]; for(i=0;i<20;i++)p[20]=new int;for(i=1;i<=20;i++)cout<<a[i]<<endl;if(p){cout<<"ok"<<endl;}return 0;

2.30：

#include<iostream>#include<cmath>using namespace std;int sroot(int i){return sqrt(i);}long sroot(long x){       return sqrt(x);}double sroot( double m){      return sqrt(m);}int main(){ cout<<sroot(100)<<endl;cout<<sroot(10000)<<endl;    cout<<sroot(2.25)<<endl;return 0;}