View Compilation Error

0_0_34842201_17481.c: In function 'main':
0_0_34842201_17481.c:7:7: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
       for(int i = 0;i < T;i++)
       ^
0_0_34842201_17481.c:7:7: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_34842201_17481.c:11:14: error: redefinition of 'i'
      for(int i = 0 ;i < T;i++)
              ^
0_0_34842201_17481.c:7:15: note: previous definition of 'i' was here
       for(int i = 0;i < T;i++)
               ^
0_0_34842201_17481.c:11:6: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
      for(int i = 0 ;i < T;i++)
      ^