EXTERNAL FUNCTION-ENDEXTERNAL
WTSupported in traditional Synergy on Windows
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WNSupported in Synergy .NET on Windows
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USupported on UNIX
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VSupported on OpenVMS
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EXTERNAL FUNCTION function_1 ,access_type function_2 ,access_type [ENDEXTERNAL]
Arguments
function
The name of the external function you want to use.
access_type
The access type of the value returned by the function. Access_type is one of the following data types: a, d, d., i, p, or p., or ^VAL (return integer by value).
Discussion
The EXTERNAL FUNCTION statement declares one or more functions that your program will use and defines their return data types.
All nonprototyped, nonlocal user-defined functions must be declared with the EXTERNAL FUNCTION statement before you can use them. The EXTERNAL FUNCTION statement is not used with intrinsic functions; however, occasionally it is required for a system-supplied external function. When this is the case, the documentation will make clear what needs to be declared.
If an external function has the same name as an intrinsic function, the external function declaration replaces the intrinsic function.
Examples
The example below calls the external function sqroot, which returns a decimal value.
record val1 ,d4 val2 ,d4 result ,d6.4 external function sqroot ,d proc . . . result = %sqroot(val1, val2)