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In the following code: x = 3y + 7; the variables x and y represent numbers that can take on a number of different values.
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group_member(3) [linux man page]

GROUP_MEMBER(3) 					     Linux Programmer's Manual						   GROUP_MEMBER(3)

group_member - test whether a process is in a group SYNOPSIS
#include <unistd.h> int group_member(gid_t gid); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): group_member(): _GNU_SOURCE DESCRIPTION
The group_member() function tests whether any of the caller's supplementary group IDs (as returned by getgroups(2)) matches gid. RETURN VALUE
The group_member() function returns nonzero if any of the caller's supplementary group IDs matches gid, and zero otherwise. CONFORMING TO
This function is a nonstandard GNU extension. SEE ALSO
getgid(2), getgroups(2), getgrouplist(3), group(5) GNU
2014-03-30 GROUP_MEMBER(3)

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