RosettaCodeData/Task/Generator-Exponential/XPL0/generator-exponential.xpl0

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code ChOut=8, IntOut=11;
func Gen(M); \Generate Mth powers of positive integers
int M;
int N, R, I;
[N:= [0, 0, 0, 0]; \provides own/static variables
R:= 1;
for I:= 1 to M do R:= R*N(M);
N(M):= N(M)+1;
return R;
];
func Filter; \Generate squares of positive integers that aren't cubes
int S, C;
[C:= [0]; \static variable = smallest cube > current square
repeat S:= Gen(2);
while S > C(0) do C(0):= Gen(3);
until S # C(0);
return S;
];
int I;
[for I:= 1 to 20 do Filter; \drop first 20 values
for I:= 1 to 10 do [IntOut(0, Filter); ChOut(0, ^ )]; \show next 10 values
]