View Compilation Error

0_0_8429605_19098.c:10: error: syntax error before '&' token
0_0_8429605_19098.c: In function `X':
0_0_8429605_19098.c:20: error: `a' undeclared (first use in this function)
0_0_8429605_19098.c:20: error: (Each undeclared identifier is reported only once
0_0_8429605_19098.c:20: error: for each function it appears in.)
0_0_8429605_19098.c:20: error: `b' undeclared (first use in this function)