Celsius to Fahrenheit C++

// I use Visual Studio 2008
#include <iostream>
using namespace std;
int main() {
double ctemp; // Celsius temperature
double ftemp; // Fahrenheit temperature

// Get value of ctemp (Celsius temp).
cout << "Input a Celsius temp and press ENTER: ";
cin >> ctemp;

// Calculate ftemp (Fahrenheit temp) and output.
ftemp = (ctemp * 1.8) + 32;
cout << "Fahrenheit temp is: " << ftemp << endl;
return 0;
}