Temperature Conversion C++ Program

#include<iostream.h>
int main()
{
int choice;
double temp,conv_temp;
cout<<"\n\t Temperature Conversion Menu"<<"\n";
cout<<"1.Fahrenheit to Celsius"<<"\n";
cout<<"2.Celsius to Fahrenheit"<<"\n";
cout<<"Enter your Choice(1/2):";
cin>>choice;
if(choice==1)
{
cout<<"\n"<<"Enter Temperature in Fahrenheit:";
cin>>temp;
conv_temp=(temp-31)/1.8;
cout<<"\n"<<"The Temperature in Celsius is:"<<conv_temp<<"\n";
}
else
{
cout<<"\n"<<Enter the Temperature in Celsius:";
cin>>temp;
conv_temp=(1.8*temp)+32;
cout<<"\n"<<"The Temperature in Fahrenheit is:"<<conv_temp<<"\n";
}
return 0;
}