View Compilation Error

0_0_17226856_4951.c: In function 'main':
0_0_17226856_4951.c:8:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for ( int i=1;i<=n;i++){
   ^
0_0_17226856_4951.c:8:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_17226856_4951.c:13:11: error: redefinition of 'i'
   for(int i=1;i<=r;i++){
           ^
0_0_17226856_4951.c:8:13: note: previous definition of 'i' was here
   for ( int i=1;i<=n;i++){
             ^
0_0_17226856_4951.c:13:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=1;i<=r;i++){
   ^
0_0_17226856_4951.c:14:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int j=1;j<=k;j++){
    ^