View Compilation Error

664493_0_0_32649.c: In function `main':
664493_0_0_32649.c:6: error: `n' undeclared (first use in this function)
664493_0_0_32649.c:6: error: (Each undeclared identifier is reported only once
664493_0_0_32649.c:6: error: for each function it appears in.)
664493_0_0_32649.c:8: error: `pa' undeclared (first use in this function)