How to cout a float number with n decimal places

Question

Possible Duplicate:
How do I print a double value with full precision using cout?

float a = 175.;
   cout << a;

If I run the previous code I'll get just 175, how can I cout the number with (for example) 3 decimal places even they were zeros .. How can I print "175.000" ?!

Solution

You need std::fixed and std::setprecision:

 std::cout << std::fixed << std::setprecision(3) << a;

These require following header:

#include <iomanip>

Comments

[Kerrek SB]

Ahh, iostreams... seamlessly combining the speediness of a turtle and the beauty of Andrew LLoyd-Webber.

[Kyle]

For future reference, if you're outputting multiple values, you only need to pass the manipulators once: float a = 2.5; float b = 3.5; std::cout << std::fixed << std::setprecision(3); std::cout << a << std::endl; std::cout << b << std::endl;

[ReinstateMonica3167040]

@MuhammadBarrima Please accept this answer if that's what you needed to show that this question is resolved.