View Compilation Error

0_0_22619039_4324.c: In function 'main':
0_0_22619039_4324.c:13:3: error: unknown type name 'bool'
   bool tof;
   ^
0_0_22619039_4324.c:18:9: error: 'true' undeclared (first use in this function)
     tof=true;
         ^
0_0_22619039_4324.c:18:9: note: each undeclared identifier is reported only once for each function it appears in