View Compilation Error

688770_0_0_19770.c:6: error: syntax error before "select"
688770_0_0_19770.c: In function `main':
688770_0_0_19770.c:11: error: `bool' undeclared (first use in this function)
688770_0_0_19770.c:11: error: (Each undeclared identifier is reported only once
688770_0_0_19770.c:11: error: for each function it appears in.)
688770_0_0_19770.c:11: error: syntax error before "flag"
688770_0_0_19770.c:17: error: `true' undeclared (first use in this function)
688770_0_0_19770.c:18: error: `flag' undeclared (first use in this function)
688770_0_0_19770.c:31: error: `false' undeclared (first use in this function)