Subfunction parameter transfer address

# Include <stdio. h>
Void fa (int a)/* Changing a in the function will not bring back the main function (a in the main function is still the original value )*/
{
A ++;
Printf ("in function fa: a = % d \ n", a); a = 2
}
Void fb (int * a)/* a is a pointer type. Change * a in the function. The changed value will be returned to the main function */
{
(* A) ++;
Printf ("in function fb: * a = % d \ n", * a); a = 2
}
Void main ()
{
Int n = 1;
Printf ("in the main process, before calling the function fa: n = % d \ n", n); n = 1
Fa (n );
Printf ("in the main process, after calling the function fa, before calling the function fb: n = % d \ n", n); n = 1
Fb (& n);/* address where the real parameter is n */
Printf ("in the main process, after the function fb is called: n = % d \ n", n); n = 2
}