[Help] C++, how to show full decimals, i.e. 10.500 ? [answered]

[orbitalfreak]

Need a little help for a program I have due tomorrow...

I need to know how to make decimal numbers display in full using C++ (devC++ from www.bloodshed.net , compiler). For instance, with:
float x1 = 1.0;

I want to code this:
cout << x1 << endl;

and have it display:
1.00000
not this:
1.0

I want it with several decimal places, not just until it terminates. Can anyone give me the function or flag to do this. I think it's something like fixed, showpos, or somethng like that.

 

[hong]

Are you allowed to use C?

#include <stdio.h>

printf("%1.5f\n", (double)x1);

 

[orbitalfreak]

Sorry, I'm not familiar with the printf() function, I was taught only cout and ofstream. Thanks anyway.

Some expanded info: I know that what I'm looking for is a one-time thing. You either call a function or set a flag, and it stays for the rest of the program (well, I guess you could un-set it). It would be something introduced in an Intro to Programming course.

 

[drothgery]

I pulled this out of Microsoft's online docs for VC++ -- which means I haven't tested this at all -- and I haven't written any C++ in years (if this isn't your homework, then use a language that's better with strings, like Perl, C#, Visual Basic.NET, or Java), but I think that

cout<<setprecision(6)<<x1<<endl;

ought to work.

 

[orbitalfreak]

Yea, setprecision() is what I'm looking for, but it's not working for me. I'm sure it's something trivial that I'm missing too.

And yes, this is homework, and C++ is the only thing I'm familiar with. I'm a math major, not computer science. Dropped CompSci like a hot potato; I play on computers, don't work on/with them!

*****

edit: Success!
cout.setf(ios::fixed);
cout << setprecision(5);
That got everything working right for me. Thanks for pointing me in the right direction!

 

[drothgery]

Yea, setprecision() is what I'm looking for, but it's not working for me. I'm sure it's something trivial that I'm missing too.

And yes, this is homework, and C++ is the only thing I'm familiar with. I'm a math major, not computer science. Dropped CompSci like a hot potato; I play on computers, don't work on/with them!

*****

edit: Success!
cout.setf(ios::fixed);
cout << setprecision(5);
That got everything working right for me. Thanks for pointing me in the right direction!

The setf bit was actually in the example I looked at, I just didn't think it was necessary. Sorry about that.