12-17-2001
C program with two results.
I have this program that I execute into UNIX UX and after into UNIX AIX. The program are just below:
#include <stdio.h>
struct A
{
double d;
char a[1];
};
struct B
{
char a[1];
double d;
};
void main()
{
struct A Va;
struct B Vb;
printf("%d", sizeof(Va));
printf("%d", sizeof(Vb));
}
I got the following results for this program:
HP UX
12
12
AIX
16
12
Why this diference ?
Last edited by Gandalfcgb; 12-17-2001 at 07:21 AM..
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
I wrote a ksh program on Unix.
One thing I don't understand: some users run it with different results.
I suspect it's either "cat" or "grep" command.
Basically, with one group of user, the 'cat' or 'grep' command is not getting the data I need and that changed the result.
Is the above... (2 Replies)
Discussion started by: cin2000
2 Replies
2. Programming
Hi,
Program A: uses pipe()
I am able to read the stdout of PROGAM B (stdout got through system() command) into PROGRAM A using:
* child
-> dup2(fd, STDOUT_FILENO);
-> execl("/path/PROGRAM B", "PROGRAM B", NULL);
* parent
-> char line;
-> read(fd, line, 100);
Question:
---------... (1 Reply)
Discussion started by: vvaidyan
1 Replies
3. Programming
Hi,
I wanted to know if i can write a program using switches and signals, etc to trace execution of other unix program which calls c program internally.
If yes how? If not with signals and switches then are there any other methods apart from debugging with gdb/dbx. (3 Replies)
Discussion started by: jiten_hegde
3 Replies
4. UNIX for Dummies Questions & Answers
Hi,
i want to write a script that executes a program (exec?) .
this program then requires a filename as input.
how do i give it this input in the script so the program will be complete run and close by the script.
e.g.
exec prog.exe
program then asks for filename
"enter filename:"... (1 Reply)
Discussion started by: tuathan
1 Replies
5. Shell Programming and Scripting
I can call a C program from the shell and results are outputted as normal. The C program processes some files and spits out a .csv file.
If I scheduled it in cron, there is no output.
If their a special way to schedule C programs in cron?
thanks & regards (1 Reply)
Discussion started by: hazno
1 Replies
6. Programming
I wrote a simple program that generates a random word 10,000,000 times.
I wrote it in python, then in C++ and compared the two completion times. The python script was faster! Is that normal? Why would the python script be faster? I was under the impression that C++ was faster. What are some of... (2 Replies)
Discussion started by: cbreiny
2 Replies
7. Homework & Coursework Questions
Long story short: I'm working inside of a Unix SSH under a bash shell. I have to code a C program that generates a random number. Then I have to call the compiled C program with a Perl program to run the C program 20 times and put all the generated random #s into a text file, then print that text... (1 Reply)
Discussion started by: jdkirby
1 Replies
8. Shell Programming and Scripting
Hello ,
When using vim, can ctag and cscope support recording search results and displaying the history results ? Once I jump to one tag, I can use :tnext to jump to next tag, but how can I display the preview search result? (0 Replies)
Discussion started by: 915086731
0 Replies
9. Shell Programming and Scripting
I created a program, so a kid can practice there math on it. It dispenses varies math problems and the kid must input an answer. I also want it to grade the work they have done, but I can't find the best place for it to print out the grade.
I have:
if ( $response =~ m/^/ ) {
$user_wants_to_quit... (1 Reply)
Discussion started by: germany1517
1 Replies
10. Shell Programming and Scripting
Good morning all,
This is the file name in question OD_Orders_2019-02-19.csv
I am trying to create a bash script to read into files with yesterdays date on the file name while retaining the rest of the files name. I would like for $y to equal, the name of the file with a formula output with... (2 Replies)
Discussion started by: Ibrahim A
2 Replies
LEARN ABOUT LINUX
bsearch
BSEARCH(3) Linux Programmer's Manual BSEARCH(3)
NAME
bsearch - binary search of a sorted array
SYNOPSIS
#include <stdlib.h>
void *bsearch(const void *key, const void *base,
size_t nmemb, size_t size,
int (*compar)(const void *, const void *));
DESCRIPTION
The bsearch() function searches an array of nmemb objects, the initial member of which is pointed to by base, for a member that matches the
object pointed to by key. The size of each member of the array is specified by size.
The contents of the array should be in ascending sorted order according to the comparison function referenced by compar. The compar rou-
tine is expected to have two arguments which point to the key object and to an array member, in that order, and should return an integer
less than, equal to, or greater than zero if the key object is found, respectively, to be less than, to match, or be greater than the array
member.
RETURN VALUE
The bsearch() function returns a pointer to a matching member of the array, or NULL if no match is found. If there are multiple elements
that match the key, the element returned is unspecified.
CONFORMING TO
SVr4, 4.3BSD, POSIX.1-2001, C89, C99.
EXAMPLE
The example below first sorts an array of structures using qsort(3), then retrieves desired elements using bsearch().
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct mi {
int nr;
char *name;
} months[] = {
{ 1, "jan" }, { 2, "feb" }, { 3, "mar" }, { 4, "apr" },
{ 5, "may" }, { 6, "jun" }, { 7, "jul" }, { 8, "aug" },
{ 9, "sep" }, {10, "oct" }, {11, "nov" }, {12, "dec" }
};
#define nr_of_months (sizeof(months)/sizeof(struct mi))
static int
compmi(const void *m1, const void *m2)
{
struct mi *mi1 = (struct mi *) m1;
struct mi *mi2 = (struct mi *) m2;
return strcmp(mi1->name, mi2->name);
}
int
main(int argc, char **argv)
{
int i;
qsort(months, nr_of_months, sizeof(struct mi), compmi);
for (i = 1; i < argc; i++) {
struct mi key, *res;
key.name = argv[i];
res = bsearch(&key, months, nr_of_months,
sizeof(struct mi), compmi);
if (res == NULL)
printf("'%s': unknown month
", argv[i]);
else
printf("%s: month #%d
", res->name, res->nr);
}
exit(EXIT_SUCCESS);
}
SEE ALSO
hsearch(3), lsearch(3), qsort(3), tsearch(3)
COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2003-11-01 BSEARCH(3)