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# Testing for nil values. tv:= true; io.print(tv); fv:= false; io.print(fv); io.print("strings"); z := calc.str("nil"); x := calc.isnil(z); io.print(x); y := calc.isnil("something"); io.print(y); a := calc.str(nil); x := calc.isnil(a); io.print(x); io.print("integers"); i := calc.int("nil"); x := calc.isnil(i); io.print(x); y := calc.isnil(0); io.print(y); io.print("floats"); f := calc.flt(nil); x := calc.isnil(f); io.print(x); x := calc.isnil(3.14); io.print(x); io.print("nil"); g:= nil; x:= calc.isnil(g); io.print(x); x:= calc.isnotnil(g); io.print(x);
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