Re: ::::|| VU ||:::: LearnC_lecture01

jazak ALLAH kher

asad bhi aaj se lecture start kar rahe hen

jin ka cs201 subject he

ya wo C++ ko seekhne me interested hen  wo regular touch rakhen

thanxxxxx.....

On Thu, Mar 17, 2011 at 10:25 PM, And-or-Logic <bc100400662asad@gmail.com> wrote:

*************Today is Lecture01**************

Topic:

Constants variables and keywords

why need Constants and variables:

programming k duran data ko store karney k ley hum ko variables ki zaroort hoti hai.fix values wali quantites ko use karney k ley 

hum ok constants ki zaroort parti hai.

for example

3x+4y=20

iss example mai 3 or 20 aesy quantities hain jo fix hain in ki values kabi change nahi honey matlb k 3 ney always 3 or 20 ney always 20 hi 

rahna hai. 

jab k x,y yeh quantities change ho sakty hain.

Types of Constants:

1)Primary Constants

2)Secondary Constants

Today will discuss only Primary Constants.

Primary Constants:

There are three types belong to Primary constants that are

1.integer constants

2.real constants

3.character constants 

integer constants

Aesy numeric values jin k andr decimal nahi hota wo integers constants hoty hain 

example

426

1024

6896

-1204

-9685

Note:what about 23.03 is it also an integer constant or no??? post the ans here

real constants:

Real constants ko aksr aik aor name sey yad kiya jata hai yani Floating point constants.

Real constants ko 2 tarha sey likha ja sakta hai.

i.fractional form

ii.Ex-ponential form

Math waly hzraat ko pta hi ho ga k Ex-ponential form kiya hoti hai.

for example

426.0

12.236

-65.2e+3(yeh ex-ponential form hai)

-58.20

yeh values Real type constants ki catagories main aati hain.

character constants:

character constant assi value ko kehty hian jiss mai single alphabet ya single digit ya phir single special symbol hoo

character constaant ko single inverted commas k andr likha jata hai.Both inverted commas left point waly honey chahy.

for example

,c, is wrong because this type of commas not supported

"a" is wrong because double quotes not allowed

'a' is right  because this type of commas is allowed

 a is wrong  because there are no inverted commas

'1a' is wrong more than one digit is here

Rules for making Constants(integers)

1.integer values main kam az kam aik digit zaroor hona chahy.

2.decimal point kissi bi soart mai iss type k constant mai nahi aasakta

3.intergs constants positvie ya negative hosakta hai.

4.agr value k sath koi bi sign na lgya ho to compiler us values ko by default positive samj leta hai.

5.2digits k darmiyan space ya alphabetic nahi aasakty.

6.integers constant ki range -32768 to +32767 tak ho sakti hai.

Rules for making Constants(Real constants)

1.Real values main kam az kam aik digit zaroor hona chahy.

2.it must have a decimal point yani iss mai aeshariya(.) zaroor ayega

3.Real constants positvie ya negative hosakta hai.

4.Default sign +ve hota hai.

5.2digits k darmiyan space ya alphabetic nahi aasakty.

Rules for making Constants(character)

1.Maximum length of a character constant should be 1 character.

2.are closed in inverted commas.

3.can use alphabet,digit and special symbol

Exercise:

'A B' is a character constant or not?

 +0.56 is positive integer constant or not?

 +347690 is a positive integer constant or not?

 

*******************End of Lecture01

--

Take your soul out of the way from cheristanity 

Asad Ali

BSc (Semester-02) 

City.Lahore

Gmail:bc100400662asad@gmail.com

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روزِ محشر عذر ھائے من پذیر
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