View Compilation Error

0_0_35017629_3432.c: In function 'main':
0_0_35017629_3432.c:7:12: error: 'i' undeclared (first use in this function)
        for(i=1;i<=n;++i)
            ^
0_0_35017629_3432.c:7:12: note: each undeclared identifier is reported only once for each function it appears in