2 1 Fig.1-2 Fig.1-1 int double 1-1 variable Fig.1-1 int int m int n double double x double y type Fig.1-2 4 4 4 int double 4 4 Fig.1-1 m n int x y double n m y x double int int m, n; double x, y; 3 1-1 Fig.1-3 m, n x, y object Fig.1-3 address n 212 x 216 int n; double x; n x n x 212 216 4 1 & List 1-1 n1 n2 Column 1-1 15 73 address operator & unary & operator Column 1-2 &n1 &n2 n1 n2 x &x & &x & x