View Compilation Error

0_0_27145300_17723.c:3:1: error: unknown type name 'bool'
 bool isRun(int y){
 ^
0_0_27145300_17723.c: In function 'isRun':
0_0_27145300_17723.c:5:10: error: 'true' undeclared (first use in this function)
   return true;
          ^
0_0_27145300_17723.c:5:10: note: each undeclared identifier is reported only once for each function it appears in
0_0_27145300_17723.c:7:10: error: 'false' undeclared (first use in this function)
   return false;
          ^