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sathishc58 started a topic How to compare strings using awk?

in C

Oct 17 '10, 11:07 AM
How to compare strings using awk?
Hi All,

I have the following text file and I want to display only the lines where "Vacancy" field (or column) is set to "YES".

$ cat movielist
[Showtimes],[Movie Title],[Vacancy]
1300 2Oct,X-files,Yes
1600 2Oct,Xmen,No
1700 2Oct,Spiderman, Yes

Code:

1 show_file() 2 { 3 echo "Show file is called";

...
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sathishc58 started a topic How to connect to MS-Access using C (I am using Cygwin)

in C

Sep 20 '10, 04:41 AM
How to connect to MS-Access using C (I am using Cygwin)

Dear All,

I want to connect to MS-Access using C. I am using cygwin. Those who dont know about cygwin, it is just an emulator of linux supports cc/gcc/CC and g++.

Please avoid giving link to VC++, C#.

I have three fields in MS-Access. FName, LName and City

I want to insert some values from my "C" program.

I searched net but I was able to find only links to VC++...

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sathishc58 started a topic Need help on sempahore & semaphore set?

in C

Jul 18 '10, 07:21 AM
Need help on sempahore & semaphore set?

Hi All,

I started preparing on ipcs mechanisms. There are many tutorials and examples available in net for shared memory and semaphores.

My requirement is I have to lock a shared memory segment using semaphore. Before I implement the program I wanted to get a better idea.

Question:- Can anyone explain in which case we would use "single semaphore" and "semaphore set".
...

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sathishc58 started a topic Why do we need self-referential structure?

in C

Jul 1 '10, 01:47 AM
Why do we need self-referential structure?

Hi All,

We know what is self-referential structure and it is widely used in creating data structure (for ex: linked-list)

struct xxx
{
int a;
struct xxx *ptr;
}

Why should I declare "ptr" to be of the same type. Cannot I declare "ptr" as "int" or "void" as it is going to store only the address.

I searched net,...

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sathishc58 started a topic Doubt related to ptr-to-ptr

in C

Jun 26 '10, 12:31 PM
Doubt related to ptr-to-ptr
Hi All,

This is a sample program for pointer-to-pointer memory allocation and program works well.

Code:

#include <stdio.h> int main() { char a[5][5] = {"One", "Two", "Thr", "four", "Five" }; char **b; int i, j; //b = (char **) malloc(5 * sizeof(a[0])); b = (char **) malloc(20);

...
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sathishc58 replied to Please explain why the program seg fault?

in C

Jun 17 '10, 09:55 AM
Dear Banfa,

Thanks for your reply. Could you please let me know the suggestion/answer as how argv[] in main() behaves.

Because argv[] would be declared with NULL dimension always if I am not wrong. I wrote the program by keeping argv[] in mind.

Thanks & Regards
Sathish Kumar

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sathishc58 started a topic Please explain why the program seg fault?

in C

Jun 17 '10, 09:26 AM
Please explain why the program seg fault?
Hi All,

I tried to understand the reason for core dump but I could not get the reason. Could anyone help me to figure out the issue.

Code:

1 #include <stdio.h> 2 #include <string.h> 3 #include <malloc.h> 4 5 int main() 6 { 7 int i; 8 char *ptr[]; --> If dimension is given then the

...
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sathishc58 started a topic Doubts related to C/C++

in C

Jun 5 '10, 02:45 PM
Doubts related to C/C++

Hi All,

Could anybody answer for the following queries?

1) How addition/subtraction of two different objects is possible in C without operator overloading? Here "int" and "float" could be taken as two different objects. (Not sure whether my understanding is correct)

2) I have given a simple structure which is used to construct a linked list.
struct a
{
char...

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sathishc58 started a topic Doubt related to free()

in C

Jan 9 '09, 06:18 AM
Doubt related to free()

Hi All
I have a question related to free().

For example
A(char *buffer) call B(char *buffer)
B(char *buffer) in turn calls C(char *buffer)
C(char *buffer) in turn calls D(char *buffer)
D(char *buffer) in turn calls E(char *buffer)
and so on.........
I pass a pointer as a parameter from A()
A(char *buffer);
1) This buffer was freed somewhere in some function. (Deallocation could...

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sathishc58 started a topic How to find unused macros in our program?

in C

Sep 8 '08, 03:03 PM
How to find unused macros in our program?

Hi All

I have a simple program

#define DUMMY_MACRO 10

main()
{
int a;
}

When I execute lint check for the above file it states

variable "a" is unused.

Likewise is there any way to find out the macros which were used not used in our file

Thanks & Regards
Sathish Kumar

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sathishc58 started a topic Please explain the behaviour of strlen() in the program

in C

Jun 11 '08, 12:21 PM
Please explain the behaviour of strlen() in the program

Hi All

Please explain why strlen returns() "16" as output here and explain the o/p for sizeof() as well

main()
{
char a[3]={'a','b','c'};
printf("strlen= %d\n", strlen(a));
printf("sizeof= %d\n", sizeof(a));
printf("%d %d", strlen(a),sizeo f a);
}

Output

strlen=16
sizeof=3
16 3...

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sathishc58 started a topic Please explain why sizeof behaves like this?

in C

Jun 3 '08, 07:14 AM
Please explain why sizeof behaves like this?

Hi All

#include <stdio.h>
#include <string.h>

#define SYSTEM_TABLE "SYSIBM"

int main()
{
printf("size is %d %d\n", sizeof(SYSTEM_T ABLE - 1), (sizeof(SYSTEM_ TABLE) - 1) );
}

Output

size is 4 6

I can understand the reason for the seconds value i.e. 6.

Please explain the reason for the...

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sathishc58 started a topic Please clear this doubt relating to Forest (DataStructures)

in C

May 26 '08, 03:26 PM
Please clear this doubt relating to Forest (DataStructures)

Hi All

I recently studied about "Forest" Datastructures.

Supposed we have two trees. Could not represent diagramatically

Tree a
======
1) 10 is the root node
2) 9 is the

Tree a Tree b
===== =====
...

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sathishc58 started a topic Difference between Circular Linked list and Loop in linked list

in C

May 21 '08, 11:18 AM
Difference between Circular Linked list and Loop in linked list

Hi

Can anyone explain me the difference between circular linked list and looped linked list?

1) In Circular linked list Next part of last node will be pointing to the first nodes starting address.

2) What is meant by loop then?

Thanks & Regards
Sathish Kumar

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sathishc58 started a topic Please explain me about unsigned char?

in C

Apr 30 '08, 02:10 PM
Please explain me about unsigned char?

Hi All

I dont have much idea about unsigned char. I know only the range of the unsigned char i.e 0 to 255.

I want to copy this long data into a unsigned char array

unsigned long a=59128808

unsigned char b[20];

I want to copy using only memcpy and not through sprintf. I dont mind creating a pointer to long and then copying to array.

I tried to copy but I was...

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sathishc58 started a topic WIll this program cause any memory leak?

in C

Apr 18 '08, 10:25 AM
WIll this program cause any memory leak?

Hi All

Please review the program and let me know whether my program will cause memory leak or not.

1 #include <stdio.h>
2
3 struct emp
4 {
5 int empno;
6 char empname[10];
7 } obj;
8
9
10 void copy(struct emp *);
11 void freeStruct(stru ct emp);
12
13 main()...

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sathishc58 started a topic Compilation error when attempting to initalize int **ptr[][]

in C

Dec 14 '07, 01:49 PM
Compilation error when attempting to initalize int **ptr[][]

HI All

I tried out this program to know the difference between pointer-to-pointer and 2D Arrays. I compiled it using C++ compiler.

main()
{
int **ptr=new ptr[10][10];
}

"ptr3.c", line 3: Error: Type name expected instead of "ptr".
"ptr3.c", line 3: Error: Cannot use int(*)[10] to initialize int**.
2 Error(s) detected.
...

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sathishc58 started a topic Why the following program generates segmentation fault?

in C

Nov 15 '07, 10:15 AM
Why the following program generates segmentation fault?

Hi All

The below tries to fetch the details of the group to which I belongs to. But due to some reason it seg faults.

#include <grp.h>
#include <stdio.h>

main()
{
gid_t gid;
struct group *grp;
grp=getgrgid(gi d);
printf("reached \n");
printf("GroupId %d\n", grp->gr_gid);
printf("GroupNa me %s\n",...

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sathishc58 replied to Hi All What is meant by decaying of array?

in C

Nov 5 '07, 07:32 AM
Hi

Can you explain this sentence clearly? "Arrays are composed of a type but have no type". I am not that much clear.

Thanks & Regards
Sathish Kumar...

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sathishc58 started a topic Hi All What is meant by decaying of array?

in C

Nov 3 '07, 10:02 AM
Hi All What is meant by decaying of array?

Hi All

I have a very basic idea decaying of array. Can anyone clearly explain what it actually does? Or any good URL could be of great use.

Thanks & Regards
Sathish Kumar

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Profile Sidebar

How to compare strings using awk?

How to connect to MS-Access using C (I am using Cygwin)

Need help on sempahore & semaphore set?

Why do we need self-referential structure?

Doubt related to ptr-to-ptr

Leave a comment:

Please explain why the program seg fault?

Doubts related to C/C++

Doubt related to free()

How to find unused macros in our program?

Please explain the behaviour of strlen() in the program

Please explain why sizeof behaves like this?

Please clear this doubt relating to Forest (DataStructures)

Difference between Circular Linked list and Loop in linked list

Please explain me about unsigned char?

WIll this program cause any memory leak?

Compilation error when attempting to initalize int **ptr[][]

Why the following program generates segmentation fault?

Leave a comment:

Hi All What is meant by decaying of array?