View Compilation Error

0_0_9103410_6769.c: In function `main':
0_0_9103410_6769.c:14: error: `bool' undeclared (first use in this function)
0_0_9103410_6769.c:14: error: (Each undeclared identifier is reported only once
0_0_9103410_6769.c:14: error: for each function it appears in.)
0_0_9103410_6769.c:14: error: syntax error before "GetAns"
0_0_9103410_6769.c:31: error: `GetAns' undeclared (first use in this function)
0_0_9103410_6769.c:31: error: `true' undeclared (first use in this function)