T(°C) = (T(°F) - 32) × 5/9

// C++ program to convert Fahrenheit
// scale to Celsius scale
#include <bits/stdc++.h>
using namespace std;
 
// Function to convert Fahrenheit
// to Celsius
float Conversion(float n)
{
    return (n - 32.0) * 5.0 / 9.0;
}
 
// Driver code
int main()
{
    float n = 40;
    cout << Conversion(n);
    return 0;
}  

4.44444