Using Function Scopes

#include <stdio.h>
#include <conio.h>

int x = 2;
int y = 3;
int z = 4;
void fun(int x, int *y)

{
  int z;
  x = x+3;
  *y = *y+3;
  z = z+3;  
  printf("fun:  x = %1d, *y = %1d, y = %1d, z = %1d\n", x,*y,y,z);
}
int main(void){
  moo(x, &y);
  printf("main: x = %1d1, y = %1d, z = %1d\n", x,y,z);
}