View Compilation Error

0_0_33824057_3159.c: In function 'main':
0_0_33824057_3159.c:17:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i = 0; i < n-1; i++)
   ^
0_0_33824057_3159.c:17:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code