View Compilation Error

2_16253_1133412_176.c:6: error: syntax error before "node"
2_16253_1133412_176.c:9: error: syntax error before '*' token
2_16253_1133412_176.c:11: error: syntax error before '*' token
2_16253_1133412_176.c:13: error: syntax error before '*' token
2_16253_1133412_176.c: In function `init':
2_16253_1133412_176.c:15: error: `node' undeclared (first use in this function)
2_16253_1133412_176.c:15: error: (Each undeclared identifier is reported only once
2_16253_1133412_176.c:15: error: for each function it appears in.)
2_16253_1133412_176.c:15: error: syntax error before ')' token
2_16253_1133412_176.c:16: error: request for member `num' in something not a structure or union
2_16253_1133412_176.c:16: error: `a' undeclared (first use in this function)
2_16253_1133412_176.c:17: error: request for member `left' in something not a structure or union
2_16253_1133412_176.c:18: error: request for member `right' in something not a structure or union
2_16253_1133412_176.c:19: error: request for member `pre' in something not a structure or union
2_16253_1133412_176.c: At top level:
2_16253_1133412_176.c:22: error: syntax error before '*' token
2_16253_1133412_176.c: In function `btree':
2_16253_1133412_176.c:24: error: `node' undeclared (first use in this function)
2_16253_1133412_176.c:24: error: `p' undeclared (first use in this function)
2_16253_1133412_176.c:24: error: `q' undeclared (first use in this function)
2_16253_1133412_176.c:29: error: `a' undeclared (first use in this function)
2_16253_1133412_176.c:32: error: syntax error before ')' token
2_16253_1133412_176.c: At top level:
2_16253_1133412_176.c:41: error: syntax error before '&' token
2_16253_1133412_176.c: In function `s':
2_16253_1133412_176.c:43: error: syntax error before "p"
2_16253_1133412_176.c:44: error: `p' undeclared (first use in this function)
2_16253_1133412_176.c:45: error: `a' undeclared (first use in this function)