View Compilation Error

D:\HDOJ\temp\2_14855_1063431_32751.c:23: error: syntax error before "p1"
D:\HDOJ\temp\2_14855_1063431_32751.c: In function `distance':
D:\HDOJ\temp\2_14855_1063431_32751.c:25: error: `p2' undeclared (first use in this function)
D:\HDOJ\temp\2_14855_1063431_32751.c:25: error: (Each undeclared identifier is reported only once
D:\HDOJ\temp\2_14855_1063431_32751.c:25: error: for each function it appears in.)
D:\HDOJ\temp\2_14855_1063431_32751.c:25: error: `p1' undeclared (first use in this function)
D:\HDOJ\temp\2_14855_1063431_32751.c: At top level:
D:\HDOJ\temp\2_14855_1063431_32751.c:28: error: syntax error before "point"
D:\HDOJ\temp\2_14855_1063431_32751.c: In function `TriangleArea':
D:\HDOJ\temp\2_14855_1063431_32751.c:30: error: `point' undeclared (first use in this function)
D:\HDOJ\temp\2_14855_1063431_32751.c: At top level:
D:\HDOJ\temp\2_14855_1063431_32751.c:34: error: syntax error before '&' token
D:\HDOJ\temp\2_14855_1063431_32751.c: In function `circumCircleOfTriangle':
D:\HDOJ\temp\2_14855_1063431_32751.c:36: error: `point' undeclared (first use in this function)
D:\HDOJ\temp\2_14855_1063431_32751.c:39: error: `cir' undeclared (first use in this function)
D:\HDOJ\temp\2_14855_1063431_32751.c: In function `main':
D:\HDOJ\temp\2_14855_1063431_32751.c:57: error: `POINT' undeclared (first use in this function)
D:\HDOJ\temp\2_14855_1063431_32751.c:57: error: syntax error before "point"
D:\HDOJ\temp\2_14855_1063431_32751.c:58: error: `point' undeclared (first use in this function)
D:\HDOJ\temp\2_14855_1063431_32751.c:60: error: `Circle' undeclared (first use in this function)
D:\HDOJ\temp\2_14855_1063431_32751.c:60: error: syntax error before "cir"
D:\HDOJ\temp\2_14855_1063431_32751.c:61: error: `cir' undeclared (first use in this function)