November 2002
Beginner to intermediate
142 pages
4h 19m
English
Content preview from C Pocket Reference
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Floating Constants
A floating constant is represented as a sequence of decimal digits with one decimal point, or an exponent notation. Some examples are:
41.9 5.67E-3 // The number 5.67*10-3
E can also be written as e. The
letter P or p is used to
represent a floating constant with an exponent to base 2 (ANSI C99);
for example:
2.7P+6 // The number 2.7*26
The decimal point or the notation of an exponent using
E, e,
P
(*), or
p
(*) is necessary to
distinguish a floating constant from an integer constant.
Unless otherwise specified, a floating constant has type
double. The suffix F or
f assigns the constant the type
float; the suffix L or
l assigns it the type long
double. Thus the constants in the previous examples have
type double, 12.34F has type
float, and 12.34L has type
long double.
Each of the following constants has type double.
All the constants in each row represent the same value:
5.19 |
0.519E1 |
0.0519e+2 |
519E-2 |
12. |
12.0 |
.12E2 |
12e0 |
370000.0 |
37e+4 |
3.7E+5 |
0.37e6 |
0.000004 |
4E-6 |
0.4e-5 |
.4E-5 |
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.