View Compilation Error

0_0_4454162_6576.c: In function `main':
0_0_4454162_6576.c:31: error: `bool' undeclared (first use in this function)
0_0_4454162_6576.c:31: error: (Each undeclared identifier is reported only once
0_0_4454162_6576.c:31: error: for each function it appears in.)
0_0_4454162_6576.c:31: error: syntax error before "tag"
0_0_4454162_6576.c:43: error: `tag' undeclared (first use in this function)
0_0_4454162_6576.c:43: error: `false' undeclared (first use in this function)