View Compilation Error

0_0_19541710_14905.c: In function 'hanoi':
0_0_19541710_14905.c:19:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for (int i = 3; i < 65; i++)
  ^
0_0_19541710_14905.c:19:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_19541710_14905.c:24:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int x = 1; x < i; x++)
   ^