Unclear pointer and array Post: 302884483

9 More Discussions You Might Find Interesting

1. Programming

pointer

void main() { int a={1,2,3,4,5,6,7,8,9,10}; int *p=a; int *q=&a; cout<<q-p+1<<endl; } The output is 10, how? if we give cout<<q it will print the address, value won't print.... if we give cout<<p it will print the address, value won't print.... p has the base addr; q...

2. UNIX for Dummies Questions & Answers

Storing pointer array in C

All .. I am having a pointer array . And trying to store the addess into that pointer array . please see below the problem i faced code: int cnt1; char *t_array; char *f_array; for(cnt1=0; cnt1<1000; cnt1++) { t_array =...

3. Programming

pass a pointer-to-pointer, or return a pointer?

If one wants to get a start address of a array or a string or a block of memory via a function, there are at least two methods to achieve it: (1) one is to pass a pointer-to-pointer parameter, like: int my_malloc(int size, char **pmem) { *pmem=(char *)malloc(size); if(*pmem==NULL)...

4. Programming

C pointer/array duality confusion

Hi all, Can anyone provide help with getting the right syntax regarding array/pointers in C in the following code? Can't locate a specific example which clarifies this... Say I declare a typedef to an array of pointers to some type... /** * An array of ptrs to sections */ typedef...

5. Programming

help with char pointer array in C

i have an array like #define NUM 8 .... new_socket_fd = accept(socket_fd, (struct sockaddr *) &cli_addr, &client_length); char *items = {"one", "two", "three", "four", "five", "six", "seven", "eight"}; char *item_name_length = {"3", "3", "5", "4", "4", "3", "5", "5"}; ...

6. Programming

structure pointer array as function parameters

if i create an array of pointers to a structure "struct node" as: struct node *r; and create "n" number of "linked lists" and assign it to the various struct pointers r using some function with a return type as structure pointer as: r=multiplty(.......) /*some parameters*/ is...

7. Shell Programming and Scripting

best practises for scripting + a few unclear points

Hi guys, Besides the points bellow, what would best practices for scripting be ? 1) set the PATH 2) unset the current environment (set -u ?) 3) (re)set the IFS to default value - space (IFS="" <- is this correct ?) 4) check the return code for each action inside the script (cd, rsync,...

8. Programming

Character pointer to Character array

how to copy content of character pointer to character array in c programming.. char *num; char name=num;

9. Programming

Pointer for 2D array seems to be 3D in C

I am struggling with the pointer to 2D-array (cf: 2D array of pointers). Can anybody help me elaborate how the pointer x moves in the memory to access the individual of y, especially the high lighted lines? I have talked to one of the curators of the forum, but I am still not quite clear. Here...

LEARN ABOUT OSF1

nice

nice(3) 						     Library Functions Manual							   nice(3)

NAME

       nice - Changes the scheduling priority of a process

LIBRARY

       Standard C Library (libc) Berkeley Compatibility Library (libbsd)

SYNOPSIS

       #include <unistd.h>

       int nice(      int increment);

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       nice(): XSH4.2

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Specifies a value that is added to the current process priority.  You can specify a negative value.

DESCRIPTION

       The nice() function adds the value specified in the increment parameter to the nice value of the calling process.  The nice value is a non-
       negative number;  a higher nice value gives the process a lower CPU priority.

       When you are using the Standard C Library version of the nice() function, the maximum nice value for a process is 39 (2 * {NZERO} -1)   and
       the minimum is 0 (zero). Requests for values outside these limits result in the nice value being set to the corresponding limit.

       [XPG4-UNIX]  If execution of the Standard C Library nice() function fails, the system does not alter the specified priority.

       Any  process  can  lower  its  priority (numerically raise its nice value).  A process must have superuser privileges to raise its priority
       (numerically lower its nice value).

       [Tru64 UNIX]  For backward compatibility, a version of the nice() function is supported that allows nice values in the range of -20 to  20.
       Requests for values above or below these limits result in the nice value being set to the corresponding limit.  To use the backward-compat-
       ible version of nice(), compile with the Berkeley Compatibility Library (libbsd.a).

RETURN VALUES

       Upon successful completion, the nice() function returns the new nice value minus 20 ({NZERO}).  Otherwise, the function returns -1 and sets
       errno to indicate the error.

ERRORS

       The Standard C Library version of nice() sets errno to the specified values for the following conditions: The calling process does not have
       appropriate privilege.

       [Tru64 UNIX]  The libbsd.a version of nice() sets errno to the same values as the setpriority() function. For  information  about  possible
       return values for the setpriority() function, see setpriority(2).

RELATED INFORMATION

       Functions: exec(2), getpriority(2), setpriority(2)

       Standards: standards(5) delim off

																	   nice(3)