Also if a variable is declared to be static, then its value doesn't change within that function.

Static Function is a function which is only used in the file where it is declared and defined. Other files cannot use that particular function.

/*************************************
*
* Function declarations (prototypes).
*
*************************************/

/* Func1 is only visable to functions in this file. */

static void Func1(void);

/* Func2 is visable to all functions. */

void Func2(void);

/*************************************
*
* Function definitions
*
*************************************/

void Func1(void)
{
puts("Func1 called");
}

/*************************************/

void Func2(void)
{
puts("Func2 called");
}

static is a one of data storage class .whenever we declared the variable as static the value of variable is not changed.
i.e the scope of varible is entire program
ex:
int static a ;
{
a=1
while(a>0)
{
a=a+2;
}
printf("%d",a);
}
in the above program the value of "a" is each time incremented by 2.it does not reintialise to 1 each time

static functions cannot be called using objects.
static functions can have the static variables.
Eg:
public static void main(String args[])
in java.

WE can call a function in many ways
1)we can call it using fname
2)in c++ we can call it using object also
3)using friend functions we call them normally
4)in java there is another advantage in calling a function i.e
using STATIC keyword
for example:
class demo
{
void A()
{
Syste.out.println("kishore");
}
static void B
{
Syste.out.println("reddy");
}
public static void main(String a[])
{
demo d;
d.A();
B();
}
}

So here the function with static keyword is called directly with out using object and '.' operator.

static function is used access the static member variables.

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