Example

read(n)i := 1;sum := 0;product := 1;while i <= n do begin sum := sum + i; product := product * i; i := i + 1;end;write(sum);write(product);

read(n)i := 1;

product := 1;while i <= n do begin  product := product * i; i := i + 1;end;

write(product);

This example (and other material) due in part to Frank Tip

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