Monday, 6 January 2014

Explain data types in C

Data types 
They are used to define  variables before its use.As per need different data types are used in C.
For example
a)int is used to define integer numbers
{
int count;
count=4;
}
b)float is used to define floating point numbers
{
float miles;
miles=5.6;
}
c)double is used to define big floating point numbers,it reserves twice the storage for numbers.
{
double atoms;
atoms=25000;
}
d)char defines character
{
char letter;
letter='c';
These are common data types.Others are short,long,signed,unsigned.
short int<int<long int
float<double<long double
signed and unsigned
when a variable is declared as unsigned then negative range of data type is declared as positive.
example
unsigned long int c;
Memory size of different data types
short integer occupies memory of 2 bytes
long integer occupies memory of 4 bytes
signed and unsigned integer occupies memory of 2 bytes
float occupies memory of 4 bytes
double occupies memory of 8 bytes
character occupies memory of 1 byte

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