View Compilation Error

0_0_33988836_6648.c: In function 'main':
0_0_33988836_6648.c:10:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for (int i = 0; i < K; i++)
     ^
0_0_33988836_6648.c:10:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_33988836_6648.c:12:14: error: redefinition of 'i'
     for (int i = 0; i < K; i++)
              ^
0_0_33988836_6648.c:10:14: note: previous definition of 'i' was here
     for (int i = 0; i < K; i++)
              ^
0_0_33988836_6648.c:12:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for (int i = 0; i < K; i++)
     ^