How to output float to cout without scientific notation or trailing zeros?

Question

What is the most elegant way to output a floating point number in C++ with no scientific notation or trailing zeros?

Answer 1

the other example like mine actually output "200." or did "200" >> "2".

this should work for everything (as I took it from a string to val function I use).

string fix(float in) {       
    string s = to_string(in);
    size_t dot = s.find_first_of('.'), last = s.find_last_not_of(".0");

    if (dot!=string::npos) return s.substr(0, max(dot,last+1));
    else return s;
}