View Compilation Error

0_0_27729779_2063.c: In function 'main':
0_0_27729779_2063.c:11:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i = 1; i <= n; i++)
   ^
0_0_27729779_2063.c:11:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_27729779_2063.c:14:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for (int j = start; j < end; j++)
    ^