Celsius to Fahrenheit and Kelvin conversion in C++

Celsius to Fahrenheit :

Formula:
                   

                               $ F = (C \times {\frac{9}{5}}) + 32 $

• $F$ : Temperature in Fahrenheit scale
• $C$ : Temperature in Celsius scale 

#include "iostream"

using namespace std;

#define pi 3.14159

int main()
{
    float farenheit, celsius;

    cout << "Enter the temperature in celsius :" ;
    cin >> celsius ;

    // celsius to fareheit

    farenheit = (celsius * 9.0) / 5.0 + 32;

    cout << "Temperature in celsius : " << celsius << endl;
    cout << "Temperature in fahrenheit : " << farenheit ;

    return (0);

}

INPUT:      Enter the temperature in celsius : 35
OUTPUT : Temperature in Celsius : 35
                  Temperature in  Fahrenheit: 95

Celsius to Kelvin 

Formula: 

                               $K = C + 273.15$

• $K$ : Temperature in Kelvin scale
• $C$ : Temperature in Celsius scale 

#include "iostream"

using namespace std;

#define pi 3.14159

int main()
{
    float Kelvin, celsius;

    cout << "Enter the temperature in celsius :" ;
    cin >> celsius ;

    // celsius to kelvin

    Kelvin = celsius + 273.15;

    cout << "Temperature in celsius : " << celsius << endl;
    cout << "Temperature in kelvin : " << Kelvin ;

    return (0);

}

INPUT:       Enter the temperature in celsius : 35

OUTPUT : Temperature in Celsius : 35 

                  Temperature in  kelvin: 308.15