Temperature Unit Conversion

#include <iostream>
using namespace std;
 
// Write your code here
float readTemp(int raw)
{
    return static_cast<float>(raw/10);
}

float readTemp(int raw, char unit)
{
    float ret;
    switch(unit)
    {
        case 'D':
        {
            ret = readTemp(raw);
            break;
        }
        case 'C':
        {
            ret = raw/10;
            break;
        }
        case 'F':
        {
            ret = readTemp(raw) * 1.8 + 32;
            break;
        }
    }
    return ret;
}

 
int main() {
    int raw;
    char unit;
    cin >> raw >> unit;
 
    if (unit == 'D') {
        cout << readTemp(raw);
    } else {
        cout << readTemp(raw, unit);
    }
 
    return 0;
}

Solving Approach