Programming Forums > Application Development > C++

programmingnoob · Feb 7th, 2007, 12:15 AM

you know if you do float x = 12/12.0;
it'll give you x = 1.00000

now what do i do if i want to cout the result at 1.0

do I have to convert x into a string and take out "characters" or what? that just doesnt sound very sophiscated
i feel there is better approach to it?

Game_Ender · Feb 7th, 2007, 1:39 AM

Try this:

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std::cout << std::setprecision(1) << x <<std::endl;

UnKnown X · Feb 9th, 2007, 5:09 PM

That's fairly tedious, though. Isn't there a quicker way, aside from the C-style printf()?

Eoin · Feb 9th, 2007, 5:58 PM

Boost.Format offers printf() style with type-safety.

rsnd · Feb 11th, 2007, 3:06 PM

Quote:

Originally Posted by UnKnown X

That's fairly tedious, though. Isn't there a quicker way, aside from the C-style printf()?

yeah...at the top of the program justa fter those std headers go:

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using namespace std;

and then go:

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cout << setprecision(1) << x << endl;

an even easier approach is coding your own fraction printing function.

DaWei · Feb 11th, 2007, 3:13 PM

"using namespace std;" is really for small exemplar programs and isn't really a good recommendation for robust programming of a serious nature. It introduces a lot of symbols; in a large program, you're likely to duplicate some (how many 'max' labels have you seen introduced by the coder). One alternative to always qualifying the label is to introduce just a few commonly used members, such as

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using std::cout;
using std::cin;
using std::string;
etc.

bl00dninja · Feb 11th, 2007, 7:01 PM

do what dawei said. i'm drunk right now.

Feb 7th, 2007, 12:15 AM	#1
programmingnoob Hobbyist Programmer Join Date: Feb 2006 Posts: 154 Rep Power: 3	float - cut down digts? you know if you do float x = 12/12.0; it'll give you x = 1.00000 now what do i do if i want to cout the result at 1.0 do I have to convert x into a string and take out "characters" or what? that just doesnt sound very sophiscated i feel there is better approach to it?

Feb 7th, 2007, 1:39 AM	#2
Game_Ender Professional Programmer Join Date: May 2006 Location: Maryland, USA Posts: 306 Rep Power: 3	Try this: (Toggle Plain Text) std::cout << std::setprecision(1) << x <<std::endl; std::cout << std::setprecision(1) << x <<std::endl; __________________ Robotics @ Maryland AUV Team - Software Lead

Feb 9th, 2007, 5:58 PM	#4
Eoin Hobbyist Programmer Join Date: Jun 2006 Location: Ireland Posts: 152 Rep Power: 3	Boost.Format offers printf() style with type-safety. __________________ Visit my website BinaryNotions.

Feb 11th, 2007, 3:13 PM	#6
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	"using namespace std;" is really for small exemplar programs and isn't really a good recommendation for robust programming of a serious nature. It introduces a lot of symbols; in a large program, you're likely to duplicate some (how many 'max' labels have you seen introduced by the coder). One alternative to always qualifying the label is to introduce just a few commonly used members, such as (Toggle Plain Text) using std::cout; using std::cin; using std::string; etc. using std::cout; using std::cin; using std::string; etc. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Feb 11th, 2007, 7:01 PM	#7
bl00dninja Programming Guru Join Date: Oct 2004 Location: namespace std Posts: 1,246 Rep Power: 5	do what dawei said. i'm drunk right now. __________________ i put on my robe and wizard hat... Have you ever heard of Plato, Aristotle, Socrates?...Morons.

Feb 9th, 2007, 5:09 PM	#3
UnKnown X Hobbyist Programmer Join Date: Dec 2005 Location: Sandvika, Norway Posts: 114 Rep Power: 0	That's fairly tedious, though. Isn't there a quicker way, aside from the C-style printf()?

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Programming Forums > Application Development > C++

float - cut down digts?