View Compilation Error

210818_0_7250.c: In function `cmp':
210818_0_7250.c:12: error: `node' undeclared (first use in this function)
210818_0_7250.c:12: error: (Each undeclared identifier is reported only once
210818_0_7250.c:12: error: for each function it appears in.)
210818_0_7250.c:12: error: syntax error before ')' token
210818_0_7250.c:12: error: syntax error before ')' token