CALL

The CALL statement invokes a specified function.

function is the name of the function to be executed.

You can use the CALL statement to invoke functions from a 4GL application:

Programmer-defined 4GL functions

4GL built-in functions

C language functions

ESQL/C functions (if you have the INFORMIX-ESQL/C product)

Programmer-defined 4GL functions are defined in FUNCTION statements. These can appear in the same source file as the MAIN statement, or they can be compiled in separate .4GL modules (individually, or with other function and report definitions) and linked later to the MAIN program block.

When 4GL encounters a CALL statement at run time, it locates the specified FUNCTION program block and executes its statements in sequence. If the function is not a built-in function, a link-time error occurs unless exactly one definition of that function exists in the modules that comprise the program.

The program block containing the CALL statement is called the calling routine. The RETURNING clause can specify the name of one or more variables that the function returns to the calling routine. This variable (or list of variables) has the same syntax as a receiving variable in the LET statement.

References

DEFINE

FUNCTION

RETURN

WHENEVER