View Compilation Error

0_0_31998154_32026.c: In function 'num':
0_0_31998154_32026.c:39:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for(int i=0;i<6;i++)
     ^
0_0_31998154_32026.c:39:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_31998154_32026.c: In function 'main':
0_0_31998154_32026.c:51:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=0;i<n;i++)
         ^