View Compilation Error

0_0_4172339_6484.c: In function `main':
0_0_4172339_6484.c:36: error: `false' undeclared (first use in this function)
0_0_4172339_6484.c:36: error: (Each undeclared identifier is reported only once
0_0_4172339_6484.c:36: error: for each function it appears in.)
0_0_4172339_6484.c:50: error: `true' undeclared (first use in this function)