Fahrenheit to Celsius formula

#include <iostream>

double farenhajtoviCelziusovi (double a)
{
    return (a-32)*5/9;
}


int main()
{
    int a;
    std::cout<<"Vnesi gi Farenjatovite stepeni: \t";
    std::cin>>a;
    std::cout<<"Fahrenheit to Celsius: "<<farenhajtoviCelziusovi(a);


    return 0;
}