View Compilation Error

0_0_8601231_23902.c: In function `main':
0_0_8601231_23902.c:22: error: `bool' undeclared (first use in this function)
0_0_8601231_23902.c:22: error: (Each undeclared identifier is reported only once
0_0_8601231_23902.c:22: error: for each function it appears in.)
0_0_8601231_23902.c:22: error: syntax error before "bl"
0_0_8601231_23902.c:30: error: `bl' undeclared (first use in this function)