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  1. or download this
    my ( $x, $y );

...
print("b = $$b\n");  # 15
print("x = $$x\n");  # 14
print("y = $$y\n");  # 15
  2. or download this
    x = new int;
*x = 14;
  3. or download this
    if (y == NULL) {
   y = new int;
}
*y = 15;