C++ temperature conversion program

#include<iostream>
using namespace std;

 int main()
 {
    int choice;
    float F,C,K;
    cout<<"\nEnter 1 to enter temperature in Centigrade : ";
    cout<<"\nEnter 2 to enter temperature in Fahrenheit : ";
    cout<<"\nEnter 3 to enter temperature in Kelvin : ";
    cout<<"\n\nEnter your choice : ";
    cin>>choice;
    switch(choice)
    {
    case 1:
      {
         cout<<"\nEnter temperature in Centigrade : ";
         cin>>C;
         //  formula to convert centigrade to fahrenheit
         F=(1.8*C)+32;
         //  formula to convert centigrade to kelvin
         K=C+273.15;
         cout<<"\nThe Centigrade temperature in Fahrenheit is = "<<F<<endl;
         cout<<"The Centigrade temperature in Kelvin is = "<<K<<endl;
         break;
      }
    case 2:
      {
         cout<<"\nEnter temperature in Fahrenheit : ";
         cin>>F;
         //  formula to convert fahrenheit to centigrade
         C=0.555*(F-32);
         //  formula to convert fahrenheit to kelvin
         K=0.555*(F-32)+273.15;
         cout<<"\nThe Fahrenheit temperature in Centigrade is = "<<C<<endl;
         cout<<"The Fahrenheit temperature in Kelvin is = "<<K<<endl;
         break;

      }
    case 3:
      {
         cout<<"\nEnter temperature in Kelvin : ";
         cin>>K;
         //  formula to convert kelvin to centigrade
         C=K-273.15;
         //  formula to convert kelvin to fahrenheit
         F=(K-273.15)*1.8+32;
         cout<<"\nThe Kelvin temperature in Centigrade is = "<<C<<endl;
         cout<<"The Kelvin temperature in  Fahrenheit is = "<<F<<endl;
         break;
      }
    default:
      {
         cout<<"You Entered an incorrect choice "<<endl;
      }

    }
    return 0;
 }