C/C++ _Pointers and array

[Saras015]

void main(int* val)----> Can anyone explain about that Pointer funtion
{

static int retval = 0;
*val = retval++; -----> what result ?
}

[donbock]

Function main is special - it is the only (*) C function whose interface (that is, its function prototype) is specified in the C Standard. You can't change it. Your definition here for main is not compatible with the C Standard. You should change the name of your function (I'll call it Saras015). You will still need a legal main function, but I suggest you use it to call Saras015.

Try this...

#include <stdio.h>
 
void Saras015(int *val);
 
int main(void) {
  int mainVal;
 
  mainVal = 100;
  printf("%d\n", mainVal);
 
  Saras015(&mainVal);
  printf("%d\n", mainVal);
 
  Saras015(&mainVal);
  printf("%d\n", mainVal);
 
  return 0;
}
 
 
void Saras015(int *val) {
   Same as you had before
}

Run this and see what hints it gives you regarding what Saras015 is doing.