EmbLogic » abhiwadhwa777

what is the difference between sign that we include in headers and “headers.h”??????

abhiwadhwa777 — Tue, 17 Jun 2014 05:46:00 +0000

sign denotes the path of that header file.
“header.h” includes the path of current directory in which various directories are placed.

DIFFERENCE BETWEEN NUL AND NULL

abhiwadhwa777 — Mon, 21 Apr 2014 10:55:03 +0000

NULL 1 IT is macrodefined in for the null pointer . 2 NULL CAN BE DEFINED AS ((void*)0) 3 size of NULL= 4BYTES NUL 1 IT IS A USER DEFINED VARIABLE. 2 IST CHAR IN THE ASCII TABLE. 3 IT … Continue reading →

basic concepts

abhiwadhwa777 — Thu, 17 Apr 2014 11:23:53 +0000

we can exit from superuser by using exit command .
exit
changing the password of root
passwd

stack push and pop program using functions .

abhiwadhwa777 — Mon, 31 Mar 2014 07:02:54 +0000

//header.h//

#include
2 #include
3 #define MAX 5
4 int push(void **,int *);
5 int pop(void **,int *);
6 void display(void **,int *);
//fun.c//

#include”abc.h”
2 int push(void **astack,int *atop)
3 {
4 static char ch=1;
5 if(*atop >= MAX-1)
6 {
7 printf(“stack overflow”);
8 return -1;
9 }
10 if(*atop==-1)
11 {
12 *astack;
13 astack=(char*)malloc(1);
14 (*atop)++;
15 *(char*)(*astack+*atop)=ch;
16 ch++;
17 return 0;
18 }
19 (*atop)++;
20 *astack=(char*)realloc(*astack,(*atop) + 1);
21 *(char*)(*astack+*atop)=ch;
22 ch++;
23 return 0;
24
25 }
26 int pop(void **astack,int *atop)
27 {
28 if(*atop= 0; i–)
42 {
43 printf(“the data at %d pos is =%d\n”,i,*(char*)(*astack+i));
44 }
45 }
//main.c//
#include”abc.h”
2 int main()
3 {
4 int ch;
5 void *stack;
6 int top= -1;
7 do
8 {
9 printf(“1.push\n”);
10 printf(“2.pop\n”);
11 printf(“3.display\n”);
12 printf(“4.quit\n”);
13
14 scanf(“%d”,&ch);
15
16 switch(ch)
17 {
18 case 1: push(&stack,&top);
19 break;
20 case 2: pop(&stack,&top);
21 break;
22 case 3: display(&stack,&top);
23 break;
24 default : printf(“wrong choice\n”);
25 }
26 }
27 while(ch != 4);
28 return 0;
29 }
~

multiple data compression

abhiwadhwa777 — Fri, 28 Mar 2014 10:00:47 +0000

@#include
32 #include
33 #include
34 #include
35 int main()
36 {
37 char arr[55],m[55],ch1,ch2;
38 int fd,j,ret,i=0,len;
39 fd =open(“text”,O_RDONLY);
40 read(fd,&arr,55);
41 len=strlen(arr);
42 printf(“lenght of string is %d\n”,len);
43 if(fd<0)
44 {
45 perror("read");
46 exit(-1);
47
48 }
49 for(i=0;i 50 {
51 printf("%c\n",arr[i]);
52 }
53 printf("the master array is=");
54 int size;
55 size=1;
56 for(i=0;i 57 {

for(j=0;j<=size;j++)
59 {
60 if((j+1)==size)
61 {
62 m[j]=arr[i];
63 size=size++;
64 break;
65 }
66 else
67 {
68 if(m[j]==arr[i])
69 {
70 break;
71 }
72 }}
73 }
74
75 for(j=0;j<=size;j++)
76 {
77 printf("%c\n",m[j]);
78 }
79 return 0;
80 }
81
82 @
83
84
85 1.1
86 log
87 @Initial revision
88 @
89 text
90 @d7 2

ftp configuration

abhiwadhwa777 — Fri, 21 Mar 2014 07:39:43 +0000

check if package is already present or not by using

rpm -q vsftpd (as the rpm package for ftp is vsftpd)

if not present then

yum install vsftpd

yum y install

after that service vsftpd start