View Compilation Error

0_0_6420070_26783.c:16: error: syntax error before "Check"
0_0_6420070_26783.c: In function `Check':
0_0_6420070_26783.c:25: error: `true' undeclared (first use in this function)
0_0_6420070_26783.c:25: error: (Each undeclared identifier is reported only once
0_0_6420070_26783.c:25: error: for each function it appears in.)
0_0_6420070_26783.c:26: error: `false' undeclared (first use in this function)
0_0_6420070_26783.c: At top level:
0_0_6420070_26783.c:29: error: syntax error before "DFS2"
0_0_6420070_26783.c: In function `DFS2':
0_0_6420070_26783.c:34: error: `false' undeclared (first use in this function)
0_0_6420070_26783.c:51: error: `true' undeclared (first use in this function)
0_0_6420070_26783.c: In function `DFS':
0_0_6420070_26783.c:60: error: `true' undeclared (first use in this function)