where is problem of this program ( work with angel script )

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C++

Hi I wrote a simple code for use angel script. but it can config the string. where is it problem ?

#include <iostream>
#include <angelscript.h>
#include <scriptstdstring/scriptstdstring.h>
#include <string>
#include <fstream>
using namespace std;
void PrintS(string& text)
{
	cout << text;
}
void MessageCallback(const asSMessageInfo *msg, void *param)
{
	const char *type = "ERR ";
	if( msg->type == asMSGTYPE_WARNING ) 
		type = "WARN";
	else if( msg->type == asMSGTYPE_INFORMATION ) 
		type = "INFO";
	printf("%s (%d, %d) : %s : %s\n", msg->section, msg->row, msg->col, type, msg->message);
}
int main(int argc,char* argv[])
{
	int result;
	asIScriptEngine* scriptEngine=asCreateScriptEngine(ANGELSCRIPT_VERSION);
	scriptEngine->SetMessageCallback(asFUNCTION(MessageCallback), 0, asCALL_CDECL);
	RegisterStdString(scriptEngine);
	result = scriptEngine->RegisterGlobalFunction("void Print(string &text)",asFUNCTION(PrintS),asCALL_CDECL);
	cout << result<< "\n";
	string script;
	string newLine;
	fstream file("script.as",std::ios_base::in);
	while (!file.eof())
	{
		getline(file,newLine);
		script+=newLine+="\n";
	}
	asIScriptModule* scriptModule=scriptEngine->GetModule(0,asGM_ALWAYS_CREATE);
	result = scriptModule->AddScriptSection("script",&script[0],script.length());
	cout << result<< "\n";
	result = scriptModule->Build();
	cout << result<< "\n";
	asIScriptContext* scriptContext=scriptEngine->CreateContext();
	asIScriptFunction* scriptFunction=scriptEngine->GetModule(0)->GetFunctionByDecl("float main()");
	result = scriptContext->Prepare(scriptFunction);
	cout << result<< "\n";
	result = scriptContext->Execute();
	cout << result<< "\n";
	float rVal=scriptContext->GetReturnFloat();
	cout << rVal << "\n";
	system("pause");
	return 0;

}

but it work :

#include <iostream>
#include <angelscript.h>
#include <scriptstdstring/scriptstdstring.h>
#include <string>
#include <fstream>
using namespace std;
void PrintS(string& text)
{
	cout << text;
}
void MessageCallback(const asSMessageInfo *msg, void *param)
{
	const char *type = "ERR ";
	if( msg->type == asMSGTYPE_WARNING ) 
		type = "WARN";
	else if( msg->type == asMSGTYPE_INFORMATION ) 
		type = "INFO";
	printf("%s (%d, %d) : %s : %s\n", msg->section, msg->row, msg->col, type, msg->message);
}

int main(int argc,char* argv[])
{
	int result;
	asIScriptEngine* scriptEngine=asCreateScriptEngine(ANGELSCRIPT_VERSION);
	scriptEngine->SetMessageCallback(asFUNCTION(MessageCallback), 0, asCALL_CDECL);
	RegisterStdString(scriptEngine);
	//result = scriptEngine->RegisterGlobalFunction("void Print(string &text)",asFUNCTION(PrintS),asCALL_CDECL);
	cout << result<< "\n";
	string script;
	string newLine;
	fstream file("script.as",std::ios_base::in);
	while (!file.eof())
	{
		getline(file,newLine);
		script+=newLine+="\n";
	}
	asIScriptModule* scriptModule=scriptEngine->GetModule(0,asGM_ALWAYS_CREATE);
	result = scriptModule->AddScriptSection("script",&script[0],script.length());
	cout << result<< "\n";
	result = scriptModule->Build();
	cout << result<< "\n";
	asIScriptContext* scriptContext=scriptEngine->CreateContext();
	asIScriptFunction* scriptFunction=scriptEngine->GetModule(0)->GetFunctionByDecl("float main()");
	result = scriptContext->Prepare(scriptFunction);
	cout << result<< "\n";
	result = scriptContext->Execute();
	cout << result<< "\n";
	float rVal=scriptContext->GetReturnFloat();
	cout << rVal << "\n";
	system("pause");
	return 0;

}