What's wrong with this code??

[crptcblade]

I've been struggling to figure out what's wrong with this. Can somebody help? Using VC++ I have this code :

#include <stdio.h>
#include <iostream.h>
#include <string.h>

string sMyStr;

int main()
{
	sMyStr = "Hello";
	return 0;
}

I get these errors :

C:\Program Files\Microsoft Visual Studio\MyProjects\jwDOS3\jwDOS3.cpp(5) : error C2146: syntax error : missing ';' before identifier 'sMyStr'

C:\Program Files\Microsoft Visual Studio\MyProjects\jwDOS3\jwDOS3.cpp(5) : error C2501: 'string' : missing storage-class or type specifiers

C:\Program Files\Microsoft Visual Studio\MyProjects\jwDOS3\jwDOS3.cpp(5) : fatal error C1004: unexpected end of file found