View Compilation Error

0_0_38517463_79.cpp: In function 'int main()':
0_0_38517463_79.cpp:36:10: error: 'n' was not declared in this scope
   if (c==n) printf("%d\n",n);
          ^
0_0_38517463_79.cpp:37:13: error: 'k' was not declared in this scope
   else if(a%k==0) printf("0\n");
             ^