Saturday, November 7, 2015
0
comments
Friday, June 20, 2014
Oracle
Oracle
Lab Questions
1.
Create
the table Dept based on following information.
|
Column
Name
|
Datatype
|
Length
|
Constraint
|
|
ID
|
Number
|
5
|
Primary
Key
|
|
Dept_name
|
Varchar2
|
50
|
Not
Null
|
CREATE
TABLE `Dept` (
`Id` int(5) NOT NULL,
`Dept_name` varchar(50) DEFAULT NULL,
PRIMARY KEY (`Id`)
)
2.
Insert
the values in Dept table as follows.
|
ID
|
Dept_name
|
|
10
|
IT
|
|
20
|
Account
|
|
30
|
HR
|
|
40
|
Marketing
|
|
50
|
Manufacturing
|
INSERT
INTO dept (`ID`,`Dept_name`) VALUES ( '10','IT');
INSERT
INTO dept (`ID`,`Dept_name`) VALUES ( '20','Account');
INSERT
INTO dept (`ID`,`Dept_name`) VALUES ( '30','HR');
INSERT
INTO dept (`ID`,`Dept_name`) VALUES ( '40','Marketing');
INSERT
INTO dept (`ID`,`Dept_name`) VALUES ( '50','Manufacturing');
3.
Create
the table Emp based on following information.
|
Column
Name
|
Datatype
|
Length
|
Constraint
|
|
ID
|
Number
|
5
|
Primary
Key
|
|
Emp_name
|
Varchar2
|
50
|
|
|
Address
|
Varchar2
|
50
|
|
|
DateOfBirth
|
Date
|
|
|
|
Gender
|
Char
|
1
|
Check
(M or F) only
|
|
Post
|
Varchar2
|
50
|
Not
Null
|
|
Email
|
Varchar2
|
20
|
Unique
|
|
Salary
|
Number
|
10,2
|
Not
Null
|
|
Dept_id
|
Number
|
5
|
Foreign
Key References with Dept_id of Dept table.
|
CREATE
TABLE `emp` (
`ID` int(5) NOT NULL,
`Emp_name` varchar(50) DEFAULT NULL,
`Address` varchar(50) DEFAULT NULL,
`DateOfBirth` date DEFAULT NULL,
`Gender` enum('M','F') DEFAULT NULL,
`Post` varchar(50) NOT NULL,
`Email` varchar(20) NOT NULL,
`Salary` double(10,2) NOT NULL,
`Dept_id` int(5) DEFAULT NULL,
PRIMARY KEY (`ID`,`Email`),
KEY `FK_emp` (`Dept_id`),
CONSTRAINT `FK_emp` FOREIGN KEY (`Dept_id`)
REFERENCES `dept` (`ID`)
)
4.
Describe
the Structure of the above created table DEPT and EMP.
5.
Insert
about 10 values in Emp table.
INSERT
INTO emp (
ID
,Emp_name ,Address ,DateOfBirth ,Gender ,Post ,Email ,Salary ,Dept_id
)
VALUES (
'', 'emp1',
'address1', '2014-06-19', 'M',
'post1', 'email1@email.com', '10,000',
'10'
);
INSERT
INTO emp (
ID
,Emp_name ,Address ,DateOfBirth ,Gender ,Post ,Email ,Salary ,Dept_id
)
VALUES (
'', 'emp2',
'address2', '2014-06-19', 'M',
'post2', 'email2@email.com', '20,000',
'20'
);
INSERT
INTO emp (
ID
,Emp_name ,Address ,DateOfBirth ,Gender ,Post ,Email ,Salary ,Dept_id
)
VALUES (
'', 'emp3',
'address3', '2014-06-19', 'M',
'post3', 'email3@email.com', '30,000',
'30'
);
INSERT
INTO emp (
ID
,Emp_name ,Address ,DateOfBirth ,Gender ,Post ,Email ,Salary ,Dept_id
)
VALUES (
'', 'emp4',
'address4', '2014-06-19', 'M',
'post4', 'email4@email.com', '40,000',
'40'
);
INSERT
INTO emp (
ID
,Emp_name ,Address ,DateOfBirth ,Gender ,Post ,Email ,Salary ,Dept_id
)
VALUES (
'', 'emp5',
'address5', '2014-06-19', 'M',
'post5', 'email5@email.com', '50,000',
'50'
);
INSERT
INTO emp (
ID
,Emp_name ,Address ,DateOfBirth ,Gender ,Post ,Email ,Salary ,Dept_id
)
VALUES (
'', 'emp6',
'address6', '2014-06-19', 'M',
'post6', 'email6@email.com', '60,000',
'10'
);
INSERT
INTO emp (
ID
,Emp_name ,Address ,DateOfBirth ,Gender ,Post ,Email ,Salary ,Dept_id
)
VALUES (
'', 'emp7',
'address7', '2014-06-19', 'F',
'post7', 'email7@email.com', '70,000',
'20'
);
INSERT
INTO emp (
ID
,Emp_name ,Address ,DateOfBirth ,Gender ,Post ,Email ,Salary ,Dept_id
)
VALUES (
'', 'emp8',
'address8', '2014-06-19', 'M',
'post8', 'email8@email.com', '80,000',
'30'
);
INSERT
INTO emp (
ID ,Emp_name
,Address ,DateOfBirth ,Gender ,Post ,Email ,Salary ,Dept_id
)
VALUES (
'', 'emp9',
'address9', '2014-06-19', 'F',
'post9', 'email9@email.com', '90,000',
'40'
);
INSERT
INTO emp (
ID
,Emp_name ,Address ,DateOfBirth ,Gender ,Post ,Email ,Salary ,Dept_id
)
VALUES (
'', 'emp10',
'address10', '2014-06-19', 'M',
'post10',
'email10@email.com',
'100,000', '50'
);
6.
Modify
the Data type of email to varchar2(50).
ALTER TABLE `emp` CHANGE `Email` `Email` VARCHAR2( 50 )
7.
Change
the datatype of Gender of Emp table to Varchar2(10).
ALTER TABLE `emp` CHANGE `Gender` `Gender` VARCHAR2( 10 )
8.
Increase
the salary of Employees who works in IT department by 25%.
update
`emp` SET `Salary`=salary+(salary*0.25) WHERE `Dept_id`=10
9.
Add
the Not Null constraint to Emp table on Emp_name column.
ALTER TABLE `emp` CHANGE `Emp_name` `Emp_name` VARCHAR( 50 )
NOT NULL
10.
Drop
the column Address from the table Emp.
ALTER TABLE `emp` DROP `Address`
11.
List
all the Employees who works in the IT department.
SELECT *
FROM `emp` WHERE `Dept_id`=10
12.
List
all the Employees name, email and salary whose name starts with "a".
Sort data in descending order based on Salary paid.
SELECT
`Emp_name`,`Email`,`Salary` FROM `emp` ORDER BY `Salary` DESC
13.
List
the Average salary of each Department.
SELECT
AVG(Salary) as average_salry,Dept_name
FROM
`emp` JOIN dept
ON
dept.ID=emp.Dept_id
GROUP BY
`Dept_id`
Monday, June 16, 2014
linux method to write practical
Aim of the Experiment
Create a user Student and assign the password to P@ssw0rd.
Objective
The main objective of the experiment is to create a user and assign password. We need to use ‘useradd’ command, which is responsible for creating a new user or update default new user information.
The ‘useradd’ command creates a new user account using the values specified on the command line and the values from the system. The new user account will be entered into the system files (/etc/passwd) as needed, the home directory (/home/username) will be created, and initial files copied, depending on the command line options.
System Requirements
Hardware Requirement:
PIV Computer
512 MB RAM
40 GB Hard Disk
Software Requirement:
Linux OS
Aim of the Experiment
Create a user Student and assign the password to P@ssw0rd.
Objective
The main objective of the experiment is to create a user and assign password. We need to use ‘useradd’ command, which is responsible for creating a new user or update default new user information.
The ‘useradd’ command creates a new user account using the values specified on the command line and the values from the system. The new user account will be entered into the system files (/etc/passwd) as needed, the home directory (/home/username) will be created, and initial files copied, depending on the command line options.
System Requirements
Hardware Requirement:
PIV Computer
512 MB RAM
40 GB Hard Disk
Software Requirement:
Linux OS
Algorithm
Syntax:
Syntax is as follows for useradd command:
useradd <username>
By default the user account is locked, you need to setup a new password:
Passwd <username>
Code:
# adduser Student
# passwd Student
Output
# adduser Student
# passwd Student
Changing password for user Student.
New password: P@ssw0rd
Retype new password: P@ssw0rd
Passwd: all authentication tokens updated successfully.
Conclusion
In this way, a user Student with the password P@ssw0rd is created successfully.
Aim of the Experiment
Display the name of current working directory.
Objective
The main objective of the experiment is to display the name of the current working directory. The current directly is the directory in which a user is working at a given time. Even user is always working within a directly. There are several ways of determining what the current directly is. One is by looking at the command prompt. The ‘pwd’ command displays the absolute pathname of the current working directory to the computer screen.
System Requirements
Hardware Requirement:
PIV Computer
512 MB RAM
40 GB Hard Disk
Software Requirement:
Linux OS
Algorithm
Syntax:
Syntax is as follows:
pwd
Code:
# pwd
Output
# pwd
Output: /root/user
Conclusion
In this way, the name of the currently working directory is displayed.
Aim of the Experiment
List all the files and directories in /etc file system.
Objective
The main objective of the experiment is to list all the files and directories in /etc file system. The ‘ls’ command lists all the files and directories in /etc file system.
System Requirements
Hardware Requirement:
PIV Computer
512 MB RAM
40 GB Hard Disk
Software Requirement:
Linux OS
Algorithm
Syntax:
Syntax is as follows:
ls [/directory_name]
Code:
# ls /etc
Output
# ls /etc
Output:
acpi fstab magic rc.local adduser.conf
fstab.d magic.mime mail.rc report apm group- rmt
Conclusion
In this way, the files and direcotries in /etc file system is listed.
Syntax:
Syntax is as follows for useradd command:
useradd <username>
By default the user account is locked, you need to setup a new password:
Passwd <username>
Code:
# adduser Student
# passwd Student
Output
# adduser Student
# passwd Student
Changing password for user Student.
New password: P@ssw0rd
Retype new password: P@ssw0rd
Passwd: all authentication tokens updated successfully.
Conclusion
In this way, a user Student with the password P@ssw0rd is created successfully.
Aim of the Experiment
Display the name of current working directory.
Objective
The main objective of the experiment is to display the name of the current working directory. The current directly is the directory in which a user is working at a given time. Even user is always working within a directly. There are several ways of determining what the current directly is. One is by looking at the command prompt. The ‘pwd’ command displays the absolute pathname of the current working directory to the computer screen.
System Requirements
Hardware Requirement:
PIV Computer
512 MB RAM
40 GB Hard Disk
Software Requirement:
Linux OS
Algorithm
Syntax:
Syntax is as follows:
pwd
Code:
# pwd
Output
# pwd
Output: /root/user
Conclusion
In this way, the name of the currently working directory is displayed.
Aim of the Experiment
List all the files and directories in /etc file system.
Objective
The main objective of the experiment is to list all the files and directories in /etc file system. The ‘ls’ command lists all the files and directories in /etc file system.
System Requirements
Hardware Requirement:
PIV Computer
512 MB RAM
40 GB Hard Disk
Software Requirement:
Linux OS
Algorithm
Syntax:
Syntax is as follows:
ls [/directory_name]
Code:
# ls /etc
Output
# ls /etc
Output:
acpi fstab magic rc.local adduser.conf
fstab.d magic.mime mail.rc report apm group- rmt
Conclusion
In this way, the files and direcotries in /etc file system is listed.
Read more →
Create a user Student and assign the password to P@ssw0rd.
Objective
The main objective of the experiment is to create a user and assign password. We need to use ‘useradd’ command, which is responsible for creating a new user or update default new user information.
The ‘useradd’ command creates a new user account using the values specified on the command line and the values from the system. The new user account will be entered into the system files (/etc/passwd) as needed, the home directory (/home/username) will be created, and initial files copied, depending on the command line options.
System Requirements
Hardware Requirement:
PIV Computer
512 MB RAM
40 GB Hard Disk
Software Requirement:
Linux OS
Aim of the Experiment
Create a user Student and assign the password to P@ssw0rd.
Objective
The main objective of the experiment is to create a user and assign password. We need to use ‘useradd’ command, which is responsible for creating a new user or update default new user information.
The ‘useradd’ command creates a new user account using the values specified on the command line and the values from the system. The new user account will be entered into the system files (/etc/passwd) as needed, the home directory (/home/username) will be created, and initial files copied, depending on the command line options.
System Requirements
Hardware Requirement:
PIV Computer
512 MB RAM
40 GB Hard Disk
Software Requirement:
Linux OS
Algorithm
Syntax:
Syntax is as follows for useradd command:
useradd <username>
By default the user account is locked, you need to setup a new password:
Passwd <username>
Code:
# adduser Student
# passwd Student
Output
# adduser Student
# passwd Student
Changing password for user Student.
New password: P@ssw0rd
Retype new password: P@ssw0rd
Passwd: all authentication tokens updated successfully.
Conclusion
In this way, a user Student with the password P@ssw0rd is created successfully.
Aim of the Experiment
Display the name of current working directory.
Objective
The main objective of the experiment is to display the name of the current working directory. The current directly is the directory in which a user is working at a given time. Even user is always working within a directly. There are several ways of determining what the current directly is. One is by looking at the command prompt. The ‘pwd’ command displays the absolute pathname of the current working directory to the computer screen.
System Requirements
Hardware Requirement:
PIV Computer
512 MB RAM
40 GB Hard Disk
Software Requirement:
Linux OS
Algorithm
Syntax:
Syntax is as follows:
pwd
Code:
# pwd
Output
# pwd
Output: /root/user
Conclusion
In this way, the name of the currently working directory is displayed.
Aim of the Experiment
List all the files and directories in /etc file system.
Objective
The main objective of the experiment is to list all the files and directories in /etc file system. The ‘ls’ command lists all the files and directories in /etc file system.
System Requirements
Hardware Requirement:
PIV Computer
512 MB RAM
40 GB Hard Disk
Software Requirement:
Linux OS
Algorithm
Syntax:
Syntax is as follows:
ls [/directory_name]
Code:
# ls /etc
Output
# ls /etc
Output:
acpi fstab magic rc.local adduser.conf
fstab.d magic.mime mail.rc report apm group- rmt
Conclusion
In this way, the files and direcotries in /etc file system is listed.
Syntax:
Syntax is as follows for useradd command:
useradd <username>
By default the user account is locked, you need to setup a new password:
Passwd <username>
Code:
# adduser Student
# passwd Student
Output
# adduser Student
# passwd Student
Changing password for user Student.
New password: P@ssw0rd
Retype new password: P@ssw0rd
Passwd: all authentication tokens updated successfully.
Conclusion
In this way, a user Student with the password P@ssw0rd is created successfully.
Aim of the Experiment
Display the name of current working directory.
Objective
The main objective of the experiment is to display the name of the current working directory. The current directly is the directory in which a user is working at a given time. Even user is always working within a directly. There are several ways of determining what the current directly is. One is by looking at the command prompt. The ‘pwd’ command displays the absolute pathname of the current working directory to the computer screen.
System Requirements
Hardware Requirement:
PIV Computer
512 MB RAM
40 GB Hard Disk
Software Requirement:
Linux OS
Algorithm
Syntax:
Syntax is as follows:
pwd
Code:
# pwd
Output
# pwd
Output: /root/user
Conclusion
In this way, the name of the currently working directory is displayed.
Aim of the Experiment
List all the files and directories in /etc file system.
Objective
The main objective of the experiment is to list all the files and directories in /etc file system. The ‘ls’ command lists all the files and directories in /etc file system.
System Requirements
Hardware Requirement:
PIV Computer
512 MB RAM
40 GB Hard Disk
Software Requirement:
Linux OS
Algorithm
Syntax:
Syntax is as follows:
ls [/directory_name]
Code:
# ls /etc
Output
# ls /etc
Output:
acpi fstab magic rc.local adduser.conf
fstab.d magic.mime mail.rc report apm group- rmt
Conclusion
In this way, the files and direcotries in /etc file system is listed.
Linux Practical
Linux Lab Questions
Create a user Student and assign the password to P@ssw0rd.
Open terminal
Switch user to root
# su
password: <root password>
Synax: useradd <username>
passwd <username>
solution:
# useradd Student
# passwd Student
new unix password : P@ssw0rd
retype new unix password : P@ssw0rd
Display the name of current working directory.
Syntax : pwd
# pwd
/home/student
List all the files and directories in /etc file system.
Syntax : ls <dir name>
# ls /etc
List all the hidden files and directories in your home directory.
Syntax : ls –a <dir name>
# ls –a ~
Write a command that displays only directory in your home directory.
Syntax: ls –d */
# cd ~
# ls –d */
Write a command to see the list of recent command used.
Syntax: history
# history
1 cd ~
2 ls –d */
Create a directory 'test' on your home directory.
Syntax : mkdir <directory name>
# cd ~
# mkdir test
Create a file 'myFile' on your home directory using vi editor.
Syntax : vi <file name>
# vi myFile
File will create and open
Press i for insert mode
Write following text
“this is test file”
Press “ESC” to switch command mode
Then press “shift + : ”
:w + Enter (to save)
:wq + Enter (to save and exit)
:wq! + Enter (to save and exit force fully)
:x + Enter (to save and exit)
Create a Symbolic Link of ‘myFile’ in the currenct directory.
Syntax : ln –s <source file path> <destination file path>
# ln –s /home/student/myFile softfile
Rename the ‘test’ directory to ‘NewTest’ directory.
Syntax : mv <old dir> <new dir>
# mv test NewTest
Delete the ‘myFile’ file from the home directory.
Syntax : rm <fille name>
# cd ~
# rm myFile
Write the symbolic representation (eg: rwx-wx—x) of each of the following numeric permissions.
644 ………………….. : rw-r--r--
755 …………………..
600 …………………..
000 …………………..
137 …………………..
124 …………………..
You have given a file with permissions 755, write a command that would change the permissions to r-xr—rwx ?
Syntas : chmod <permission> <file/dir>
# chmod 547 myFile
Change the permission of a file ‘myFile’ such that owner gets full permission, group member get read , write permission & other gets read only permission.
Syntas : chmod <permission> <file/dir>
# chmod 761 myFile
Change the permission of the file so that all category of the user gets full permission.
Syntax : chmod <permission> <file/dir>
# chmod 777 myFile
Write a command that search ‘passwd’ file in /etc directory.
Syntax :find <file name>
# cd /etc
# find passwd
Redirect the above search result to the ‘result.out’ file.
Syntax : find <search result> > <output file name>
# find passwd > result.out
# cat result.out
Redirect the error message to the ‘error.out’ file.
Write a command that counts words, lines, bytes and characters of the ‘result.out’ file.
syntax: wc <option> <filename>
e.g.
# wc –w result.out //words
# wc –l result.out //lines
# wc –c result.out //bytes
# wc –m result.out //characters
Sort the ‘error.out’ file.
Sort the content of /etc/passwd in dictionary word and save the sorted result in another file named sorted_passwd.
Syntax: sort <filename> > <result filename>
# sort /etc/passwd > sorted_password
Display the /etc/passwd line for any account that starts with the letter ‘a’.
Syntax: grep “search text/letter” <filename>
# grep “^a” /etc/passwd
Find all the configuration files inside /etc directory that have .conf as the file extension.
Syntax:find <folder path> *.extension
# find /etc/*.conf
Find all the empty files inside the current directory.
Syntax: find <directory name> -type <type> -empty
#find –type f -empty
Find all the files and directories that belongs to a user and that have 777 permission.
Display the number of lines in /etc/passwd file.
Write a shell script that displays “Hello World” .
Write a shell script that prompts for age and displays it to screen.
Write a shell script that guess root password. If password match displays the message “you are right”, other wise displays “try again”.
Write a shell script that calculate simple interest for 3 sets of P,N,R values.
Write a shell script that takes a command –line argument and reports on whether it is directry, a file, or something else.
Write a shell script that computes the gross salary of a employee according to the following.
a) if basic salary is <5000 then Allowance 10% of the basic salary.
b) if basic salary is >5000 then Allowance 25% of the basic salary.
The basic salary is entered interactively through the key board
Write a shell script that displays a list of all files in the current directory to which the user has read write and execute permissions .
Develop an interactive script that asks for a word and file name and then tells how many times that word occurred in the file.
Write a shell script which receives two files names as arguments. It should check whether the two file contents are same or not. If they are same then second file should be deleted.
Read more →
Create a user Student and assign the password to P@ssw0rd.
Open terminal
Switch user to root
# su
password: <root password>
Synax: useradd <username>
passwd <username>
solution:
# useradd Student
# passwd Student
new unix password : P@ssw0rd
retype new unix password : P@ssw0rd
Display the name of current working directory.
Syntax : pwd
# pwd
/home/student
List all the files and directories in /etc file system.
Syntax : ls <dir name>
# ls /etc
List all the hidden files and directories in your home directory.
Syntax : ls –a <dir name>
# ls –a ~
Write a command that displays only directory in your home directory.
Syntax: ls –d */
# cd ~
# ls –d */
Write a command to see the list of recent command used.
Syntax: history
# history
1 cd ~
2 ls –d */
Create a directory 'test' on your home directory.
Syntax : mkdir <directory name>
# cd ~
# mkdir test
Create a file 'myFile' on your home directory using vi editor.
Syntax : vi <file name>
# vi myFile
File will create and open
Press i for insert mode
Write following text
“this is test file”
Press “ESC” to switch command mode
Then press “shift + : ”
:w + Enter (to save)
:wq + Enter (to save and exit)
:wq! + Enter (to save and exit force fully)
:x + Enter (to save and exit)
Create a Symbolic Link of ‘myFile’ in the currenct directory.
Syntax : ln –s <source file path> <destination file path>
# ln –s /home/student/myFile softfile
Rename the ‘test’ directory to ‘NewTest’ directory.
Syntax : mv <old dir> <new dir>
# mv test NewTest
Delete the ‘myFile’ file from the home directory.
Syntax : rm <fille name>
# cd ~
# rm myFile
Write the symbolic representation (eg: rwx-wx—x) of each of the following numeric permissions.
644 ………………….. : rw-r--r--
755 …………………..
600 …………………..
000 …………………..
137 …………………..
124 …………………..
You have given a file with permissions 755, write a command that would change the permissions to r-xr—rwx ?
Syntas : chmod <permission> <file/dir>
# chmod 547 myFile
Change the permission of a file ‘myFile’ such that owner gets full permission, group member get read , write permission & other gets read only permission.
Syntas : chmod <permission> <file/dir>
# chmod 761 myFile
Change the permission of the file so that all category of the user gets full permission.
Syntax : chmod <permission> <file/dir>
# chmod 777 myFile
Write a command that search ‘passwd’ file in /etc directory.
Syntax :find <file name>
# cd /etc
# find passwd
Redirect the above search result to the ‘result.out’ file.
Syntax : find <search result> > <output file name>
# find passwd > result.out
# cat result.out
Redirect the error message to the ‘error.out’ file.
Write a command that counts words, lines, bytes and characters of the ‘result.out’ file.
syntax: wc <option> <filename>
e.g.
# wc –w result.out //words
# wc –l result.out //lines
# wc –c result.out //bytes
# wc –m result.out //characters
Sort the ‘error.out’ file.
Sort the content of /etc/passwd in dictionary word and save the sorted result in another file named sorted_passwd.
Syntax: sort <filename> > <result filename>
# sort /etc/passwd > sorted_password
Display the /etc/passwd line for any account that starts with the letter ‘a’.
Syntax: grep “search text/letter” <filename>
# grep “^a” /etc/passwd
Find all the configuration files inside /etc directory that have .conf as the file extension.
Syntax:find <folder path> *.extension
# find /etc/*.conf
Find all the empty files inside the current directory.
Syntax: find <directory name> -type <type> -empty
#find –type f -empty
Find all the files and directories that belongs to a user and that have 777 permission.
Display the number of lines in /etc/passwd file.
Write a shell script that displays “Hello World” .
Write a shell script that prompts for age and displays it to screen.
Write a shell script that guess root password. If password match displays the message “you are right”, other wise displays “try again”.
Write a shell script that calculate simple interest for 3 sets of P,N,R values.
Write a shell script that takes a command –line argument and reports on whether it is directry, a file, or something else.
Write a shell script that computes the gross salary of a employee according to the following.
a) if basic salary is <5000 then Allowance 10% of the basic salary.
b) if basic salary is >5000 then Allowance 25% of the basic salary.
The basic salary is entered interactively through the key board
Write a shell script that displays a list of all files in the current directory to which the user has read write and execute permissions .
Develop an interactive script that asks for a word and file name and then tells how many times that word occurred in the file.
Write a shell script which receives two files names as arguments. It should check whether the two file contents are same or not. If they are same then second file should be deleted.
Thursday, June 12, 2014
Monday, December 30, 2013
C Programming Tutorial | 1. Introduction
C Programming is a compiled programming language which means it needs a compiler to check the syntax error/s. We use CodeBlocks or Dev C++ or any easy programs for code editing, debugging and compiling.
Note:
Read more →
Note:
- A C-file should be saved with an extension .c
- It can be saved anywhere but needs to be compiled.
- You can edit the source code but cannot edit the executable files (.exe) or object file (.obj/.o)
Example:
#include<stdio.h>
#include<conio.h>
#include my_header.h
These are the linking files or header files generally seen at the top of any c-programmed code. By # sign you give command to the preprocessor.
The angle brackets lets the preprocessor to find the file specified at the standard location.
The files within the double quotes means that it is located in the current directory where the file is saved or in the standard directory.
printf("some text");
Here printf is a standard builtin function that expects a string as value to output to the standard device.
Each statement should ed with a semi-colon.
The strings can be either in single quotes or in double quotes.
Data Types in C-program
Friday, December 13, 2013
Subscribe to:
Posts (Atom)
.jpg)
