Static Variables

[Eirik WS]

What's the use in static variables, like 'static int INTEGER' or 'static
char CHARACTER'?

 

[Mark A. Odell]

What's the use in static variables, like 'static int INTEGER' or 'static
char CHARACTER'?

At file scope it makes the variable "private" to that file (module). When
used in block scope it changes the variables life-time from temporary to
"always there". Of course file scoped static variables also have program
duration life time but static, in that case, is not the reason why.

 

[Wolfgang Kaufmann]

* Thus spoke Eirik WS <[email protected]>:

Hallo,

What's the use in static variables, like 'static int INTEGER' or
'static char CHARACTER'?

| #include <stdio.h>
|
| void my_static_function()
| {
| static int num = 0;
| printf("value of num is %d. \n", ++num);
| }
|
| int main(int argc, char **argv)
| {
| int count = 10;
| while(count--)
| my_static_function();
| return 0;
| }

....will print:

| value of num is 1.
| value of num is 2.
| value of num is 3.
| value of num is 4.
| value of num is 5.
| value of num is 6.
| value of num is 7.
| value of num is 8.
| value of num is 9.
| value of num is 10.


Wolfgang.