Rock Weight Error

I am having trouble fixing the problems in this porgram. Thanks for any help anyone can provide.

#include <iostream>

int main()
{
float caratWt, // Weight of stone in carats
millWt, // Weight of stone in milligrams
gramWt, // weight of stone in grams
ounceWt; // Weight of stone in ounces

// Prompt the user for the weight of a precious stone in carats.
cout << endl; //endl will cause a line return on the monitor
cout << "Enter a precious stone's weight (in carats) "
cin>>caratWt;

// Convert from carats to milligrams.e number of milligrams?
millWt = caratWt * 200;
cout << "This stone weighs " << millWt << " milligrams." << endl;

// Convert from milligrams to grams.
gramWt = millWt * 1000;
cout << "This stone weighs " << gramWt << " grams." << endl;

// Convert from grams to ounces.
ounceWt = gramWt / 28.35;
cout << "This stone weighs " << ounceWt << " ounces." << endl;
}


.................................................. ...

Test 03.cpp: In function `int main()':
Test 03.cpp:11: error: `cout' undeclared (first use this function)
Test 03.cpp:11: error: (Each undeclared identifier is reported only once for
each function it appears in.)
Test 03.cpp:11: error: `endl' undeclared (first use this function)
Test 03.cpp:13: error: syntax error before `>>' token