#include <stdio.h>

struct BankAccount
{
   int    accNum;
   double balance;
};
 
void update( struct BankAccount *x )
{
   printf("Before update: (*x).accNum = %d  x->balance = %f\n",
		 (*x).accNum, x->balance);
 
   (*x).accNum = 1001;    // (*x).accNum is same as: x->accNum
   x->balance = 999999;   // x->balance is sname as: (*x).balance
 
   printf("AFTER  update: (*x).accNum = %d  x->balance = %f\n",
		 (*x).accNum, x->balance);
 
}
 
int main(int argc, char *argv[])
{
   struct BankAccount a;
 
   a.accNum  = 123;
   a.balance = 1000.0;
 
   printf("Before calling update: a.accNum = %d  a.balance = %f\n",
		 a.accNum, a.balance);
 
   update ( &a ); 
	// Pass the ADDRESS of the struct variable !
 
   printf("AFTER  calling update: a.accNum = %d  a.balance = %f\n",
		 a.accNum, a.balance);
}