類型轉換string,char,int,double

        char cArr[4]={'a','b','c','\0'};

string s=cArr;

cArr=s.c_str();

//s=cArr;
cout<<"s.size="<<s.size()<<endl;
cout<<s<<endl;
string ss="123.3";
int i;
long l;
double d;
i=atoi(ss.c_str());
l=atol(ss.c_str());
d=atof(ss.c_str());