# NAG CL Interfacee05jlc (bnd_​mcs_​optget_​real)

## 1Purpose

e05jlc is used to get the value of a real e05jbc optional parameter. e05jlc can be used before or after calling e05jbc, but the initialization function e05jac must have been called before calling e05jlc.

## 2Specification

 #include
 void e05jlc (const char *optstr, double *rvalue, Nag_E05State *state, NagError *fail)
The function may be called by the names: e05jlc or nag_glopt_bnd_mcs_optget_real.

## 3Description

e05jlc obtains the current value of a real-valued optional parameter. For example
`e05jlc ('Local Searches Tolerance', &loctol, &state, &fail);`
will result in the value of the optional parameter ${\mathbf{Local Searches Tolerance}}$ being output in loctol.
A complete list of optional parameters, their symbolic names and default values is given in Section 12 in e05jbc.

None.

## 5Arguments

1: $\mathbf{optstr}$const char * Input
On entry: a string identifying a real-valued optional parameter (as described in Section 12 in e05jbc).
2: $\mathbf{rvalue}$double * Output
On exit: if ${\mathbf{fail}}\mathbf{.}\mathbf{code}=$ NE_NOERROR on exit, rvalue contains the real value associated with the optional parameter in optstr.
3: $\mathbf{state}$Nag_E05State * Communication Structure
state contains information required by other functions in this suite. You must not modify it directly in any way.
4: $\mathbf{fail}$NagError * Input/Output
The NAG error argument (see Section 7 in the Introduction to the NAG Library CL Interface).

## 6Error Indicators and Warnings

NE_ALLOC_FAIL
Dynamic memory allocation failed.
See Section 3.1.2 in the Introduction to the NAG Library CL Interface for further information.
On entry, argument $〈\mathit{\text{value}}〉$ had an illegal value.
NE_INTERNAL_ERROR
An internal error has occurred in this function. Check the function call and any array sizes. If the call is correct then please contact NAG for assistance.
See Section 7.5 in the Introduction to the NAG Library CL Interface for further information.
NE_NO_LICENCE
Your licence key may have expired or may not have been installed correctly.
See Section 8 in the Introduction to the NAG Library CL Interface for further information.
NE_NOT_INIT
Initialization function e05jac has not been called.
The supplied optional parameter is invalid. A keyword or keyword combination was not recognized.

Not applicable.

## 8Parallelism and Performance

e05jlc is not threaded in any implementation.