/in/foo.c: In function 'main':
/in/foo.c:7:4: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
  if(a<=c)
    ^
/in/foo.c:15:4: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
  if(a>=c)
    ^