View Compilation Error

0_0_28278634_18545.c: In function 'main':
0_0_28278634_18545.c:28:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=0;i<n;i++)
   ^
0_0_28278634_18545.c:28:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_28278634_18545.c:30:11: error: redefinition of 'i'
   for(int i=0;i<n;i++)
           ^
0_0_28278634_18545.c:28:11: note: previous definition of 'i' was here
   for(int i=0;i<n;i++)
           ^
0_0_28278634_18545.c:30:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=0;i<n;i++)
   ^
0_0_28278634_18545.c:31:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int j=0;j<m;j++)
    ^