View Compilation Error

0_0_36751037_23711.c: In function 'main':
0_0_36751037_23711.c:7:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for(int i = 1 ; i <= T1 ; i++)
  ^
0_0_36751037_23711.c:7:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_36751037_23711.c:10:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int j = 0 ; j < T2 ; j++)
   ^
0_0_36751037_23711.c:16:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int k1 = 0 ; k1 < T2 - 1 ; k1++)
   ^
0_0_36751037_23711.c:18:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int k2 = 0 ; k2 < T2 - k1 - 1 ; k2++)
    ^
0_0_36751037_23711.c:28:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int k3 = 0 ; k3 < T2 ; k3++)
   ^