View Compilation Error

0_0_4598544_9249.cpp: In function `bool check()':
0_0_4598544_9249.cpp:11: error: `returnfalse' undeclared (first use this function)
0_0_4598544_9249.cpp:11: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4598544_9249.cpp:12: error: `returntrue' undeclared (first use this function)