/in/foo.c: In function 'main':
/in/foo.c:8:32: warning: implicit declaration of function 'abs' [-Wimplicit-function-declaration]
  if(a>=b+c||b>=a+c||c>=a+b||a<=abs(b-c)||b<=abs(a-c)||c<=abs(a-b))
                                ^~~
/in/foo.c:17:9: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(a==b&&a!=c||a==c&&a!=b||b==c&&b!=a)
     ~~~~^~~~~~
/in/foo.c:17:33: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(a==b&&a!=c||a==c&&a!=b||b==c&&b!=a)
                             ~~~~^~~~~~