View Compilation Error

0_0_35800986_10610.c: In function 'main':
0_0_35800986_10610.c:31:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i=1;i<=n;i++) 
   ^
0_0_35800986_10610.c:31:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_35800986_10610.c:34:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for (int j=1;j<=n;j++) 
    ^
0_0_35800986_10610.c:37:12: error: redefinition of 'i'
   for (int i=1;i<=n;i++)
            ^
0_0_35800986_10610.c:31:12: note: previous definition of 'i' was here
   for (int i=1;i<=n;i++) 
            ^
0_0_35800986_10610.c:37:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i=1;i<=n;i++)
   ^
0_0_35800986_10610.c:38:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for (int j=1;j<=n;j++)
    ^