View Compilation Error

32188_0_27731.c: In function `main':
32188_0_27731.c:6: error: `bool' undeclared (first use in this function)
32188_0_27731.c:6: error: (Each undeclared identifier is reported only once
32188_0_27731.c:6: error: for each function it appears in.)
32188_0_27731.c:6: error: syntax error before "c"
32188_0_27731.c:22: error: `c' undeclared (first use in this function)