View Compilation Error

0_0_23225664_23965.c: In function 'main':
0_0_23225664_23965.c:6:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i = 1;i <= T;i++)
         ^
0_0_23225664_23965.c:6:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_23225664_23965.c:11:17: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
                 for(int i = 0;i < n;i++)
                 ^
0_0_23225664_23965.c:18:25: error: redefinition of 'i'
                 for(int i = 0;i < n;i++)
                         ^
0_0_23225664_23965.c:11:25: note: previous definition of 'i' was here
                 for(int i = 0;i < n;i++)
                         ^
0_0_23225664_23965.c:18:17: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
                 for(int i = 0;i < n;i++)
                 ^