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ISDIGIT( ) Function

  • 發行項

Determines whether the leftmost character of the specified character expression is a digit (0 through 9).

ISDIGIT(cExpression)

Return Values

Logical

Parameters

  • cExpression
    Specifies the character expression that ISDIGIT( ) tests. Any characters after the first character in cExpression are ignored.

Remarks

ISDIGIT( ) returns true (.T.) if the leftmost character of the specified character expression is a digit (0 through 9); otherwise, ISDIGIT( ) returns false (.F.).

Example

CLOSE DATABASES
OPEN DATABASE (HOME(2) + 'Data\testdata')
USE orders  && Open Orders table
CLEAR 

DISPLAY cust_id
? ISDIGIT(cust_id)  && Displays .F.
DISPLAY order_dsc
? ISDIGIT(ALLTRIM(STR(order_dsc)))  && Displays .T.

See Also

ISALPHA( ) | CLEAR Commands | Character Functions | USE