View Compilation Error

32712_0_5605.c: In function `main':
32712_0_5605.c:6: error: `bool' undeclared (first use in this function)
32712_0_5605.c:6: error: (Each undeclared identifier is reported only once
32712_0_5605.c:6: error: for each function it appears in.)
32712_0_5605.c:6: error: syntax error before "c"
32712_0_5605.c:20: error: `c' undeclared (first use in this function)