1. C Programming
Language
By:
Yogendra Pal
yogendra@learnbywatch.com
Dedicated to My mother and Father

2. Keep your notebook with you.
Write important point and questions that comes in your mind
Solve Mind band exercise.
Rewind when not clear
Ask Questions by call or SMS or by mail
Keep Watching Keep Learning
THIS IS DATA TYPES

3. Introduction
• You learned about three primary data types
– char
– int
– float
• These primary data types can be of several
types.

4. Integer
long & short signed & unsigned

5. long and short
• Integer
– On 16-bit OS : 2 Bytes
– On 32-bit OS : 4 Bytes
• When we declare an integer it occupies 4 bytes
on a 32 bit OS.
• Sometimes it may be more than required.
• Why waste memory?
• How to save?

6. short integer
• Declare a short integer.
short int a; //OR
short b;
• It will take at least 2 bytes.
• You will save 2 bytes.
• shorts are never bigger than ints.
• Format specifier : %d

7. long integer
• Declare a long integer.
long int a; //OR
long b;
• It will take at least 4 bytes.
• Helpful if you are working on 16-bit OS.
• ints are never bigger than longs.
• Format specifier : %ld

8. signed and unsigned
• Value stored in an integer is positive by default.
• In a 16 bit OS the range for an integer will be:
-32768 to 32767
• Some times we do not need negative value.
• Why waste half of the values???
• Use signed and unsigned variable in this case.

9. unsigned integer
• Declare a unsigned integer.
unsigned int a; //OR
unsigned b;
• It will store in 2 bytes on 16-bit OS.
• Range will be : 0 to 65535
• Format specifier : %u

10. signed integer
• Declare a signed integer.
signed int a; //OR
signed b; //OR
int c;
• It will store in 2 bytes on 16-bit OS.
• Range will be : -32768 to 32767
• Format specifier : %d

11. integers
Data type Range Bytes Format
short signed int -32768 to 32767 2 %d
short unsigned int 0 to 65535 2 %u
signed int -2147483648 to 2147483648 4 %d
unsigned int 0 to 4294967295 4 %u
long signed int -2147483648 to 2147483648 4 %ld
long unsigned int 0 to 4294967295 4 %lu

12. character

13. character
• Character range : -128 to 127
signed char c; //OR
char c1;
• 128 means -128 in case of character.
• 129 means -127
• unsigned character range : 0 to 255
• Hence it will print all 256 available characters.
unsigned char c;

14. float and double
• Both are used for storing floating point value.
• float occupies 4 bytes and it’s range is:-
– -3.4e38 to +3.4e38
– Format specifier : %f
• double occupies 8 bytes and it’s range is:-
– -1.7e308 to +1.7e308
– Format specifier : %lf
double a;

15. long double
• If your demand is too high you can use it.
• long double occupies 10 bytes and it’s range is:
– -1.7e4932 to +1.7e4932
– Format specifier : %Lf
long double a;

16. floating point
Data type Range Bytes Format
float -3.4e38 to +3.4e38 4 %f
double -1.7e308 to +1.7e308 8 %lf
long double -1.7e4932 to +1.7e4932 10 %Lf

17. To get complete benefit of this tutorial solve all the quiz on
www.learnbywatch.com
For any problem in this tutorial mail me at
yogendra@learnbywatch.com
with the subject “C”
For Other information mail at
info@learnbywatch.com
From Here To
STORAGE CLASS