/in/foo.c: In function 'main':
/in/foo.c:7:4: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
  if(a<b)
    ^
/in/foo.c:12:2: error: 'elsi' undeclared (first use in this function)
  elsi if(a<c)
  ^~~~
/in/foo.c:12:2: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:12:7: error: expected ';' before 'if'
  elsi if(a<c)
       ^~
/in/foo.c:14:5: error: 'else' without a previous 'if'
     else
     ^~~~