View Compilation Error

0_0_28403794_18201.c: In function 'main':
0_0_28403794_18201.c:8:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i = 0; i < n ; i ++)
   ^
0_0_28403794_18201.c:8:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_28403794_18201.c:15:12: error: redefinition of 'i'
   for (int i = 0; i < g; i++)
            ^
0_0_28403794_18201.c:8:12: note: previous definition of 'i' was here
   for (int i = 0; i < n ; i ++)
            ^
0_0_28403794_18201.c:15:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i = 0; i < g; i++)
   ^
0_0_28403794_18201.c:18:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for (int j = 0; j < m; j++)
    ^
0_0_28403794_18201.c:28:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for (int i = 0; i < r; i++)
    ^