View Compilation Error

0_0_10431817_20618.c:11: error: syntax error before '&' token
0_0_10431817_20618.c: In function `creattree':
0_0_10431817_20618.c:13: error: `H' undeclared (first use in this function)
0_0_10431817_20618.c:13: error: (Each undeclared identifier is reported only once
0_0_10431817_20618.c:13: error: for each function it appears in.)
0_0_10431817_20618.c: In function `preorder':
0_0_10431817_20618.c:32: error: syntax error before '/' token
0_0_10431817_20618.c: In function `main':
0_0_10431817_20618.c:37: error: syntax error before '/' token
0_0_10431817_20618.c:45: error: syntax error before '/' token
0_0_10431817_20618.c: At top level:
0_0_10431817_20618.c:52: error: syntax error before "return"