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ctags: c++ warning "cannot pass objects of non-POD type"

1、不要忽视编译时的任何一个 Warning .2、正确使用输入输出流，避开高危函数。

1、printf("Hello %s" ,str.c_str());
2、cout<<str；

string 非原生类型 non-POD，编译器无法把它传入.

下面是一个网上的小例子。

im trying to compile following code
--------------------sam.cpp---------------------
#include <string>
#include <iostream>
#include <stdarg.h>
using namespace std;

void Write( const char* msg, const char* msg2, ...)
{
cout <<msg <<" "<<msg2<<endl;
}

int main()
{
string str("World");
Write("Hello","Debug out %s" ,str);
return 0;
}
-------------------------------------------

When i compile this code i get following compilation warning .

[oracle@sahyagiri test]$ g++ sam.cpp
sam.cpp: In function `int main()':
sam.cpp:17: warning: cannot pass objects of non-POD
type `struct std::string'
through `...'; call will abort at runtime

When i run the executable, a.out it fails with Illegal
instruction eror