# NAG CL Interfaceh02xxc (nag_ip_init)

## 1Purpose

h02xxc is the options structure initialization function for the H Chapter Introduction. This function or h02xyc must be called before making any use of the options structure.

## 2Specification

 #include
 void h02xxc (Nag_H02_Opt *options)
The function may be called by the names: h02xxc or nag_ip_init.

## 3Description

The integer programming (IP) functions of the H Chapter Introduction have a number of optional parameters, which are set by means of a structure of type Nag_H02_Opt. Optional parameter values may be assigned to members of an options structure directly in the program text and/or by supplying the optional values in a file which can be read by the function h02xyc.
If optional parameter values are assigned directly in the program text and no use is made of h02xyc, then h02xxc must be called before any assignments are made to the options structure. Initialization is still required even if no assignments are made to the structure before it is passed to the IP function.
If the file reading function h02xyc is used then this will automatically initialize the options structure if this has not already been done. Any direct assignment to the options structure made after a call to h02xyc must not be preceded by a call to h02xxc otherwise the values set by h02xyc will be lost. Direct assignments to the options structure made before calling h02xyc must, of course, still be preceded by a call to h02xxc.
The purpose of h02xxc is to initialize the options structure members with null values which indicate to the IP function that the optional parameter a structure member represents is not to be changed from its default value.

None.

## 5Arguments

1: $\mathbf{options}$Nag_H02_Opt * Output
On exit: the initialized options structure.

None.

Not applicable.

## 8Parallelism and Performance

h02xxc is not threaded in any implementation.