View Compilation Error

0_0_29468614_5199.c: In function 'main':
0_0_29468614_5199.c:8:2: error: unknown type name 'bool'
  bool flag = true;
  ^
0_0_29468614_5199.c:8:14: error: 'true' undeclared (first use in this function)
  bool flag = true;
              ^
0_0_29468614_5199.c:8:14: note: each undeclared identifier is reported only once for each function it appears in
0_0_29468614_5199.c:30:20: error: 'false' undeclared (first use in this function)
   default:  flag = false; break;
                    ^