View Compilation Error

0_0_14194651_24621.c:7:1: error: unknown type name 'bool'
 bool isprime(int x)
 ^
0_0_14194651_24621.c: In function 'isprime':
0_0_14194651_24621.c:9:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for(int i=2;i<sqrt(x);i++)
  ^
0_0_14194651_24621.c:9:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_14194651_24621.c:11:21: error: 'false' undeclared (first use in this function)
   if(x%i==0) return false;
                     ^
0_0_14194651_24621.c:11:21: note: each undeclared identifier is reported only once for each function it appears in
0_0_14194651_24621.c:13:9: error: 'true' undeclared (first use in this function)
  return true;
         ^
0_0_14194651_24621.c: In function 'main':
0_0_14194651_24621.c:23:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for(int i=1;i<=5000;i++)
  ^