View Compilation Error

664494_0_0_10071.c: In function `main':
664494_0_0_10071.c:9: error: `pa' undeclared (first use in this function)
664494_0_0_10071.c:9: error: (Each undeclared identifier is reported only once
664494_0_0_10071.c:9: error: for each function it appears in.)