bas7advr.hlp (Topic list)
CLNG Function Details
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CLNG converts a numeric expression to a long (4-byte) integer by rounding
the fractional part of the expression.
 
CLNG(numeric-expression)
    ■ If numeric-expression is not between -2,147,483,648 and
      2,147,483,647, inclusive, BASIC generates the error message,
      "Overflow."