View Compilation Error

0_0_23554411_29947.c: In function 'main':
0_0_23554411_29947.c:17:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=0;i<n;++i)
         ^
0_0_23554411_29947.c:17:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_23554411_29947.c:19:17: error: redefinition of 'i'
         for(int i=0;i<n;++i)
                 ^
0_0_23554411_29947.c:17:17: note: previous definition of 'i' was here
         for(int i=0;i<n;++i)
                 ^
0_0_23554411_29947.c:19:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=0;i<n;++i)
         ^
0_0_23554411_29947.c:20:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int j=i+1;j<n;++j)
         ^
0_0_23554411_29947.c:21:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int k=j+1;k<n;++k)
         ^