RosettaCodeData/Task/Periodic-table/XPL0/periodic-table.xpl0

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proc ShowPosn(N); \Show row and column for element
int N, M, A, B, I, R, C;
[A:= [ 1, 2, 5, 13, 57, 72, 89, 104]; \magic numbers
B:= [-1, 15, 25, 35, 72, 21, 58, 7];
I:= 7;
while A(I) > N do I:= I-1;
M:= N + B(I);
R:= M/18 +1;
C:= rem(0) +1;
IntOut(0, N); Text(0, " -> ");
IntOut(0, R); Text(0, ", ");
IntOut(0, C); CrLf(0);
];
int Element, I;
[Element:= [1, 2, 29, 42, 57, 58, 72, 89, 90, 103];
for I:= 0 to 10-1 do ShowPosn(Element(I));
]