/in/foo.cc: In function 'int main()':
/in/foo.cc:12:6: error: 'i' was not declared in this scope
   if(i==x1)
      ^
/in/foo.cc:16:4: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
    if(x2%i==0)
    ^~
/in/foo.cc:18:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
     if(i==x2)
     ^~