View Compilation Error

0_0_21776579_6002.c: In function 'main':
0_0_21776579_6002.c:5:27: error: 'n' undeclared (first use in this function)
         while(scanf("%d",&n)==1&&n)
                           ^
0_0_21776579_6002.c:5:27: note: each undeclared identifier is reported only once for each function it appears in
0_0_21776579_6002.c:7:21: error: 'i' undeclared (first use in this function)
                 for(i=0;i<=n;i++)
                     ^
0_0_21776579_6002.c:14:29: error: 'j' undeclared (first use in this function)
                         for(j=0;j<=n;j++)
                             ^
0_0_21776579_6002.c:15:37: error: 'k' undeclared (first use in this function)
                                 for(k=0;j+k<=n;k+=i)
                                     ^