View Compilation Error

0_0_12890638_6178.cpp: In function `void first(Data*, int*, int)':
0_0_12890638_6178.cpp:22: error: expected unqualified-id before '&' token
0_0_12890638_6178.cpp:22: error: `s' undeclared (first use this function)
0_0_12890638_6178.cpp:22: error: (Each undeclared identifier is reported only once for each function it appears in.)