C++字符数组表示字符串--易错标识

int main(int argc, char* argv[])
{
char ca[]={'1','2','3'};
cout <<ca;
cout<<endl;
cout <<ca[0];
cout<<endl;
char ca_str[]={'1','2','3','/0'};
cout <<ca_str;
cout<<endl;
cout <<ca_str[0];
cout<<endl;
int ca_int[] ={1,2,3};
cout <<ca_int;
cout<<endl;
cout <<ca_int[0];
cout<<endl;
return 0;
}