View Compilation Error

1_291_4141_15506.c: In function `main':
1_291_4141_15506.c:6: error: `bool' undeclared (first use in this function)
1_291_4141_15506.c:6: error: (Each undeclared identifier is reported only once
1_291_4141_15506.c:6: error: for each function it appears in.)
1_291_4141_15506.c:6: error: syntax error before "f"
1_291_4141_15506.c:13: error: `d' undeclared (first use in this function)
1_291_4141_15506.c:13: error: `f' undeclared (first use in this function)