Temperature Unit Conversion

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

float readTemp(int raw, char unit){
    if ( unit == 'C' ){
        return float(raw) / 10;
    }
    if ( unit == 'F' ){
        return (raw / 10 ) * 1.8 + 32;
    }
    if ( unit == 'D' ){
        return readTemp(raw);
    }   
}
 
int main() {
    int raw;
    char unit;
    cin >> raw >> unit;
 
    if (unit == 'D') {
        cout << readTemp(raw);
    } else {
        cout << readTemp(raw, unit);
    }
 
    return 0;
}

Solving Approach