View Compilation Error

0_0_20258238_18693.c:6:1: error: unknown type name 'bool'
 bool sushu(int n){
 ^
0_0_20258238_18693.c: In function 'sushu':
0_0_20258238_18693.c:10:12: error: 'false' undeclared (first use in this function)
     return false;
            ^
0_0_20258238_18693.c:10:12: note: each undeclared identifier is reported only once for each function it appears in