#include <iostream>
#include <cstdlib>

using namespace std;
int main(int argc, char *argv[]) {
    char c[] = {'0','.','5'};
    char d[] = {'6','7','8'};
    //char c[] = "0.5";
    float f = atof(c);
    float g = atof(d);
    cout << f*10;
}