View Compilation Error

0_0_38380400_18548.c: In function 'main':
0_0_38380400_18548.c:4:2: error: unknown type name 'bool'
  bool isprime(int a);
  ^
0_0_38380400_18548.c: At top level:
0_0_38380400_18548.c:18:1: error: unknown type name 'bool'
 bool isprime(int a)
 ^
0_0_38380400_18548.c: In function 'isprime':
0_0_38380400_18548.c:20:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for (int i=2;i<a;++i)
  ^
0_0_38380400_18548.c:20:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_38380400_18548.c:23:11: error: 'false' undeclared (first use in this function)
    return false;
           ^
0_0_38380400_18548.c:23:11: note: each undeclared identifier is reported only once for each function it appears in
0_0_38380400_18548.c:25:9: error: 'true' undeclared (first use in this function)
  return true;
         ^