Need my output to be in this form XXX.XXX c++ - c++

Question

for example im getting an area of 6 for a triangle, i need my output to show 006.000
i know setprecision will do the trick for limiting the decimal places to three but how do i place zeros in front of my solutions?
this is what i have
CTriangle Sides(3,4,5);
cout << std::fixed << std::setprecision(3);
cout << "\n\n\t\tThe perimeter of this tringle is = " << Sides.Perimeter();
cout << "\n\n\t\tThe area of the triangle is = " << Sides.Area();
cout << "\n\n\t\tThe angle one is = " << Sides.Angleone();
cout << "\n\n\t\tThe angle two is = " << Sides.Angletwo();
cout << "\n\n\t\tThe angle three is = " << Sides.Anglethree();
cout << "\n\n\t\tThe altitude one of the triangle = " << Sides.Altitudeone();
cout << "\n\n\t\tThe altitude two of the triangle = " << Sides.Altitudetwo();
cout << "\n\n\t\tThe altitude three of the triangle = " << Sides.Altitudethree();
with the output being
The perimeter of this triangle is = 12.000
The area of the triangle is = 6.000
The angle one is = 90.000
The angle two is = 36.870
The angle three is = 53.130
The altitude one of the triangle = 2.400
The altitude two of the triangle = 6.667
The altitude three of the triangle = 3.750
but i need all the answers to be in this form XXX.XXX regardless of what my solutions are.(because the values will change)
any help is appreciated, thanks!

Answer 1

Use can use padding and filling manipulators:
std::setfill('0'); // is persistent
//...
cout << std::setw(7) << value; // required for each output

Answer 2

Using std::internal, std::fixed, std::setfill, std::setw and std::setprecision from iomanip and related headers, you can do:
std::cout << std::fixed << std::setfill('0') << std::internal << std::setprecision(3);
std::cout << std::setw(7);
std::cout << 12.34f << "\n";
and get the desired output. See it live on Coliru!

Answer 3

See "format": String and I/O Formatting (Modern C++)

Answer 4

The printf function can do that for you have a look at the docs:
http://www.cplusplus.com/reference/cstdio/printf/
Your case is somewhat unique because:
(these are not complete code snippets, apologies)
precision only applies to floating point formatting:
$ printf("%03.3f\n", 6)
> 6.000
And left padding only applies to integer formatting:
$ printf("%03.3d\n", 6)
> 006
Good luck hopefully you can take it from here