read some book on C C program must have main() function to run. With this statement
Code:
main;
you define a symbol with name "main". Both link and compiler require this symbol and you defined it. That's why compilation and linkage works. But when you start the compiled program it tries to call the function with the name "main". It finds the symbol main in the symbol table and makes jump to the symbol definition. But because you didn't define the symbol as function it is unpredictable what is now held in the memory under the symbol main. Hopefully nulls. As result you receive core dumped, because kernel can't execute nulls or finds no instruction to execute.
When you write "unix" instead of "main", you didn't define "main" symbol and the program can't be compiled without main.
i just finished a project for a c++ class that i wrote at home on my computer, compiled with gcc. when i brought the code into school it would not compile, it would complain that cannot call main() function. at school we use ancient borland c++ from 1995. anyway my program has 20 different... (3 Replies)
Hi,
I have a main loop which calls a sub loop, which finally returns to the main loop itself. The main loop runs when a flag is set. Now, I have a signal handler for SIGINT, which resets the flag and thus stops the main loop. Suppose I send SIGINT while the program is in subloop, I get an error... (1 Reply)
Hi! I've a C program as shown below..
The line numbers and the statements of the program are separated by a space..
1 #include<stdio.h>
2 char a,b,c;
3 float x,y,z;
4 int main()
5 {
6 int d,e,f;
7 // further declarations
8 // further declarations
9 /* body*/
10 }
11 void fun1()
12... (1 Reply)
why does this not work?
#include <stdio.h>
#include <stdlib.h>
char getFileMode(char charChanger) {
char filetype; /*var to hold the value to be returned*/
filetype = charSetter; /*set filetype to "l" if it is a symlink*/
return filetype;
}
int main(void){
char... (8 Replies)
Hi friends,
when I am passing arguments to main, I want another function to be able to have access to that function, the problem is that I am creating athread, which has a function like void *xyz(void *), how can pass the refernce of argv to this function, if you see my program, you will better... (2 Replies)
H friends,
As we know, a function returns a value and that value is saved somwhere. like
int Sum( int x, int y )
{
return x + y;
}
Total = Sum( 10, 20 );
The value 30 is saved in variable Total.
Now the question is, what int value does the function main return, and where is it... (5 Replies)
Hello All,
I am trying to call a function from the calling main program from a dlopened library function, below is the entire code, when I execute it it crashes with sigill. Can you guys help me out I guess I am missing out on the linker flag or something here. besides I am new to AIX and... (1 Reply)
I feel that i am missing something obvious but i can't find what is wrong.
I have a script that is launching some functions with "&" and each call is feeding the array with a value. When all calls are finished I just want to retrieve the values of that array.
It is looking like that :
... (5 Replies)
Hi. I have some code, that for some reason, I could not post it here in this post. Here's the address for it:
#if 0 shc Version 4.0.1, Generic Shell Script Compiler GNU GPL Version 3 Md - Pastebin.com
First off, I used "shc" to convert the code from shell script to C.
And The... (6 Replies)
Discussion started by: ignatius
6 Replies
LEARN ABOUT ULTRIX
dwtmainsetareas
DwtMainSetAreas(3Dwt)DwtMainSetAreas(3Dwt)Name
DwtMainSetAreas - Sets up or adds the menu bar, command window, work window, and scroll bar widgets to the main window widget of the appli-
cation.
Syntax
void DwtMainSetAreas(widget, menu_bar, work_window,
command_window, horizontal_scroll_bar,
vertical_scroll_bar)
Widget widget;
Widget menu_bar;
Widget work_window, command_window;
Widget horizontal_scroll_bar, vertical_scroll_bar;
Arguments
widget Specifies the main window widget ID.
menu_bar Specifies the widget ID for the menu bar to be associated with the main window widget. You can set this ID only after creating
an instance of the main window widget. The attribute name associated with this argument is DwtNmenuBar.
work_window
Specifies the widget ID for the work window to be associated with the main window widget. You can set this ID only after creat-
ing an instance of the main window widget. The attribute name associated with this argument is DwtNworkWindow.
command_window
Specifies the widget ID for the command window to be associated with the main window widget. You can set this ID only after cre-
ating an instance of the main window widget. The attribute name associated with this argument is DwtNcommandWindow.
horizontal_scroll_bar
Specifies the scroll bar widget ID for the horizontal scroll bar to be associated with the main window widget. You can set this
ID only after creating an instance of the main window widget. The attribute name associated with this argument is DwtNhorizon-
talScrollBar.
vertical_scroll_bar
Specifies the scroll bar widget ID for the vertical scroll bar to be associated with the main window widget. You can set this ID
only after creating an instance of the main window widget. The attribute name associated with this argument is DwtNverti-
calScrollBar.
Description
The DwtMainSetAreas function sets up or adds the menu bar, work window, command window, and scroll bar widgets to the application's main
window widget. You must set these areas up before the main window widget is realized, that is, before calling the X intrinsics function
XtRealizeWidget.
Each area is optional; therefore, you can pass NULL to one or more of these arguments. The title bar is provided by the window manager.
See Also
Guide to the XUI Toolkit: C Language Binding
Guide to the XUI Toolkit Intrinsics: C Language Binding
DwtMainSetAreas(3Dwt)
08-03-2015
C program must have main() function to run. With this statement