View Compilation Error

0_0_9913412_3572.c: In function `main':
0_0_9913412_3572.c:14: error: `false' undeclared (first use in this function)
0_0_9913412_3572.c:14: error: (Each undeclared identifier is reported only once
0_0_9913412_3572.c:14: error: for each function it appears in.)
0_0_9913412_3572.c: In function `judge':
0_0_9913412_3572.c:30: error: `false' undeclared (first use in this function)
0_0_9913412_3572.c:31: error: `true' undeclared (first use in this function)