Question about decimal places

I am needing to output dollar amounts to the screen. I tried using float and double but they only print numbers that are greater than 0. I use a function to do a calculation and when I return the calculated value it only prints non-zero numbers. For example, when the calculation is done and to total amount should be $3.50 it only prints 3.5 How do I get it to print 3.50?

Code:

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#include <iomanip> // stream manipulators for formatted output
#include <iostream>

int main(void) {
    double dollars = 3.5;
    cout << "$" << std::setprecision(2) << dollars <<"\n";
    return 0;
}

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You should use fixed as well

Code:

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    std::cout << "$" << std::fixed << std::setprecision(2) << dollars <<"\n";

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Kurt