/in/foo.cc: In function 'int main()':
/in/foo.cc:12:3: error: 'else' without a previous 'if'
   else //c<b
   ^~~~
/in/foo.cc:16:4: error: 'else' without a previous 'if'
    else
    ^~~~
/in/foo.cc:19:4: error: 'else' without a previous 'if'
    else//b<a
    ^~~~
/in/foo.cc:23:3: error: 'else' without a previous 'if'
   else//c<a
   ^~~~
/in/foo.cc:27:4: error: 'else' without a previous 'if'
    else
    ^~~~