View Compilation Error

867910_0_0_17398.c: In function `main':
867910_0_0_17398.c:9: error: `n' undeclared (first use in this function)
867910_0_0_17398.c:9: error: (Each undeclared identifier is reported only once
867910_0_0_17398.c:9: error: for each function it appears in.)