Sponsored Content
Top Forums Programming Compiler/Runtime uses of sizeof Post 302962439 by GSalisbury on Monday 14th of December 2015 04:49:49 PM
Old 12-14-2015
1. & 2. Yes
Code:
string.h

and
Code:
sys/types.h

have been included.
3. An example a might be char
Code:
a[8]

.
4. An example c might be
Code:
int c = sizeof(a)

.
5. Using gcc on RedHat Linux boxes.

What I was after is what, if any, would be the virtue of using:
Code:
c = sizeof(a); strncpy( a, b, c );

vs.
Code:
strncpy( a, b, sizeof(a) );

I'm not a C maven (I can kludge along given good consult) but it seems to me that using the sizeof value in a separate int adds overhead while not altering the execution result.

I appreciate that we're talking fractional nano-seconds and negligible amounts but am interested in clarifying the precept.
 

9 More Discussions You Might Find Interesting

1. Programming

sizeof

we know that sizeof never returns zero when used with structure then why in this case it is returning zero struct foo { char c; }; void main() { struct foo f; cout<<sizeof(f); } i am working on solaris 5.8 isn't the above function should return the size of empty structure (7 Replies)
Discussion started by: ramneek
7 Replies

2. UNIX for Dummies Questions & Answers

xl C/C++ compiler to GCC compiler

Hi, we are converting from IBM-AIX(xl c/c++ compiler) to Linux(GCC complier). As a part of this i need to change the CFLAGS. The xl c/c++ complier CFLAGS is CFLAGS := $(CDEBUG) $(PROJECT_INCLUDE_DIRS) $(COBJECT_MODE) -qcpluscmt -qmakedep -qcheck=all \ -qalign=bit_packed $(LINT_FLAGS)... (0 Replies)
Discussion started by: pbattu1
0 Replies

3. Programming

How Can a Machine Reads a Compiler Since A Compiler is Written in Text! Not Binaries?

To make a programming language you need a compiler, so what was the first programming language and how was is created if you need the compiler first? The compiler itself is considered as a high language comparing to the machine! since the compiler is not created in 1's and 0's... Eventhough i... (12 Replies)
Discussion started by: f.ben.isaac
12 Replies

4. Programming

sizeof an array of structure without using 'sizeof' operator

Hi All, is it possible to find out the size of an array of structures ( without using 'sizeof' operator). The condition is we have the array of structure instant but we are not aware of the elements inside the structure. Can someone help me out? Thanks in advance. (18 Replies)
Discussion started by: rvan
18 Replies

5. Programming

How to get the sizeof char pointer

The below code throws the error, since the size of x = 19 is not passed to the cstrCopy function. using namespace std; static void cstrCopy(char *x, const char*y); int main () { char x; const string y = "UNIX FORUM"; cstrCopy(x,y.c_str()); return 0; } void cstrCopy(char *x,... (3 Replies)
Discussion started by: SamRoj
3 Replies

6. Programming

Doubts regarding sizeof() operator

Hi, There are some bewildering sizeof() questions I have in my mind. Could anyone shed some light on this? int main() { printf("%d\n", sizeof(main)); // Ans: 1 } That is, the sizeof() a function identifier though it is treated internally as a pointer gives 1 byte always, why? ... (5 Replies)
Discussion started by: royalibrahim
5 Replies

7. UNIX for Dummies Questions & Answers

cc compiler and gcc compiler

hi, can we install gcc compiler in unix based OS(sun solar,IBM AIX,HP,etc) and also can we install sun cc compiler in AIX environment and vice versa. and more ..is linux support cc compiler regards Ajay (3 Replies)
Discussion started by: ajaysahoo
3 Replies

8. Programming

sizeof(object) in C++

Hi, I have defined the class and call the sizeof(object to class) to get the size. # include <iostream> # include <iomanip> using namespace std; class sample { private: int i; float j; char k; public: sample() { } (2 Replies)
Discussion started by: ramkrix
2 Replies

9. Shell Programming and Scripting

Sizeof a file from directory path in perl

Hai how to find size of a file?? ex : /home/kiran/pdk/sample/calibre this is a path In that I have to find size of a files in side a calibre(it is the folder) like .results or .summary (1 Reply)
Discussion started by: kiran425
1 Replies
Graphics::Primitive::Insets(3pm)			User Contributed Perl Documentation			  Graphics::Primitive::Insets(3pm)

NAME
Graphics::Primitive::Insets - Space between things DESCRIPTION
Graphics::Primitive::Insets represents the amount of space that surrounds something. This object can be used to represent either padding or margins (in the CSS sense, one being inside the bounding box, the other being outside) SYNOPSIS
use Graphics::Primitive::Insets; my $insets = Graphics::Primitive::Insets->new({ top => 5, bottom => 5, left => 5, right => 5 }); METHODS
Constructor new Creates a new Graphics::Primitive::Insets. Instance Methods as_array Return these insets as an array in the form of top, right, bottom and left. bottom Set/Get the inset from the bottom. equal_to Determine if these Insets are equal to another. left Set/Get the inset from the left. right Set/Get the inset from the right. top Set/Get the inset from the top. zero Sets all the insets (top, left, bottom, right) to 0. AUTHOR
Cory Watson, "<gphat@cpan.org>" SEE ALSO
perl(1) COPYRIGHT &; LICENSE Copyright 2008-2010 by Cory G Watson. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.12.3 2010-08-21 Graphics::Primitive::Insets(3pm)
All times are GMT -4. The time now is 08:42 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy